6742-50

> _ 7 CO TW 7rA)|| O\/E\= (CO **Pressur** (DD ry **e & V** @) ( mn Z Wrenn **acuum Switches** S 

S W I T C H I N G A N D S E N S I N G S O L U T I O N S 

Herga Electric Limited is an independent UK manufacturer of switching systems. In addition to pressure and vacuum switches, we offer other innovative switching solutions:- 

**hergair** Airswitching systems **herga** Footswitches **hergalite** Fibre Optics / Infra red safety products **herga** Hand controls 

Our expertise spans the automotive, medical, packaging, domestic appliance and spa industries. 

Herga is driven to respond rapidly to delight our customers. Herga seeks to develop its relations with customers to achieve their business goals. 

## **Global Presence** 

Our distributor network covering the worlds major markets enables technical help and assistance to be just a phone call away. 

## **Continuous Improvement** 

Herga’s approval to ISO 9002 ensures that we are fully in control of our quality. However, this is just the starting point for an aspiring World Class company. We encourage training and development and continuous improvements at individual, team and company level. 

## **How can we help you?** 

This brochure provides a brief overview of our product range. If you require further information, please contact us at our e-mail address: herga.electric@dial.pipex.com 

## **Herga’s customers worldwide include** 

**BMW/Rover Electrolux Jacuzzi RS Components Siemens** Ff **General Electric** 

1999 **FOR FURTHER INFORMATION TEL: +44 (0)1284 701422  FAX: +44 (0)1284 753112** ISSUE 01 As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. 

**Pressure & Vacuum Switches** 

**==> picture [526 x 607] intentionally omitted <==**

**----- Start of picture text -----**<br>
6702 High Pressure Switch<br>High pressure switch all plastic construction. Ranges 1.4-13.8 Bar (20-200 PSI). Page PV1 & 2<br>Two (2) Pole Electrical Switching.<br>ee: See<br>6773 Double Diaphragm Pressure Switch<br>Double diaphragm construction to meet double insulation requirements of  Page PV3<br>EN 60335-2-60. Water presence detection.<br>a<br>6761 and 6763 Low Air Pressure Vacuum Switches<br>Printed circuit board mounted, pressure/vacuum switches. UL versions available.  Page PV4<br>Range from (0.015 Bar - 1.0 Bar Pressure) (-0.015 Bar - 0.670 Bar Vacuum).<br>eeeee<br>6741 and 6742 Medium Pressure Switches<br>Constructed in Nylon 12 material (pressure range 0.1 Bar to 8.2 Bar).  Page PV5 & 6<br>Single or double pole in 8 adjustable switch ranges. UL versions available.<br>a:1<br>6731 and 6732 Low Pressure Switches<br>Constructed in Nylon 12 material (pressure range (0.0037 Bar to 0.137 Bar). Page PV7 & 8<br>Single or double pole in 3 adjustable switch ranges. UL versions available.<br>eeSie<br>6753 Low Air Pressure/Vacuum Switches<br>Small versatile compact differential switch with low contact inertia for rapid switching Page PV9 & 10<br>(range 2.5 mbar to 40 mbar).<br>ee.ee<br>6721 and 6722 Vacuum Switches<br>Constructed in Nylon 12 material (vacuum range -0.0075 Bar to -0.670 Bar). Page PV11 & 12<br>Single or double pole in 5 adjustable switch ranges. UL versions available.<br>ee Y i<br>Pressure Conversion Chart<br>For more commonly used measurements, including flow, liquid, force and weight Page PV13<br>equivalents.<br>eee| )<br>Certification Markings<br>Page PV14<br>Covers most worldwide authorities/certification marks.<br>E E<br>Accessories / Switch Housings<br>Air and electrical connections are available for all pressure and vacuum switches. Please Page PV15<br>also refer to Airswitching section or contact herga for details.<br>S d<br>Fax Back Sheet<br>Page PV16<br>For your fast quotation service.<br>ee<br>**----- End of picture text -----**<br>


**FOR FURTHER INFORMATION TEL: +44 (0)1284 701422  FAX: +44 (0)1284 753112** 

ISSUE 01 

1999 

As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. 

**6702 ~ High Pressure Switch** 

## **Benefits** 

- O High pressure switch, all plastic construction (glass loaded nylon) 

- O Alternate diaphragm and connectors available for volume orders 

**==> picture [34 x 12] intentionally omitted <==**

**----- Start of picture text -----**<br>
6702<br>**----- End of picture text -----**<br>


- O Excellent repeatability 

- O Switches have adjustable pressure and differential O Specific settings can be set for volume orders O IP65 enclosures class II double insulated 

**==> picture [9 x 12] intentionally omitted <==**

**----- Start of picture text -----**<br>
0<br>**----- End of picture text -----**<br>


**==> picture [9 x 12] intentionally omitted <==**

**----- Start of picture text -----**<br>
0<br>**----- End of picture text -----**<br>


**==> picture [43 x 12] intentionally omitted <==**

**----- Start of picture text -----**<br>
0 0<br>**----- End of picture text -----**<br>


**1. Model Number** 

**2. Operating Pressure** 

   - A 20 - 50 PSI (1.40 - 3.45 Bar) Red Spring B 40 - 100 PSI (2.76 - 6.89 Bar) White Spring C 80 - 200 PSI (5.52 -13.79 Bar) Blue Spring 

**3. Additional Operating (Springs)** 

   - A 20 - 50 PSI (1.40 - 3.45 Bar) B 40 - 100 PSI (2.76 - 6.89 Bar) C 80 -  200 PSI (5.52 - 13.79 Bar) D 20 - 50 PSI (1.40 - 3.45 Bar) & 40 - 100 PSI (2.76 -   6.89 Bar) E 40 - 100 PSI (2.76 - 6.89 Bar) & 80 - 200 PSI (5.52 - 13.79 Bar) F 80 - 200 PSI (5.52 - 13.79 Bar) & 20 - 50 PSI  (1.40 -   3.45 Bar) G 20 - 50 PSI (1.40 - 3.45 Bar) & 40 - 100 PSI  (2.76 -   6.89 Bar) & 80 - 200 PSI (5.52 - 13.79 Bar) 

   - Z No additional springs supplied 

**4. Electrical Microswitching Rating** A 21A 250V ac Silver Change Over Contacts B 0.1A 250V ac Gold Change Over Contacts C 0.1A 24V ac/dc Gold Change Over Contacts 

**5. Packaging and Label Option** A Herga individually packed in plain carton B Herga vacuum form tray (for quantities 10+) 

**FOR FURTHER INFORMATION TEL: +44 (0)1284 701422  FAX: +44 (0)1284 753112** 

ISSUE 01 

1999 

As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. 

## **6702 ~ High Pressure Switch** 

## **6702 Pressure Switch** 

The industrial pressure switch is moulded entirely in plastic with the exception of the pressure connection and is water, oil and dust proof to IP65. The switches have excellent repeat accuracy, even over widely varying ambient conditions. 

The operating pressure is adjustable externally using the thumb screw on the top and the approximate pressure setting can be seen through a window in the cover. To discourage unauthorised tampering, the adjusting screw can be locked in position with an M1.5mm Allen screw. 

The microswitches have independent vernier adjustment and are normally set to operate within 2 PSI on rising pressure. Where two pressure levels are to be controlled, the switches can be adjusted separately so that one switch will operate at up to 80% of the level of the second. The switches can also be set to operate simultaneously on falling pressure instead of rising pressure. 

The pressure switch is of Class II construction with double insulation. For quantity orders, many special options are available, please enquire:- 

- O Single or double pole switching set to specific pressure levels 

- O Alternative connector sizes 

- O Alternative diaphragms and metal chambers to resist particular fluids 

- O Installation and setting instructions are supplied with each product 

**Note:** differentials are approximate 

|**Note:** differentials are approximate|**Note:** differentials are approximate|**Note:** differentials are approximate||||
|---|---|---|---|---|---|
|**Suitability for use with different operating media**||||||
|**Pressure Medium**|||**6702**|||
|Acetone<br>Ammonia(Liquid)<br>Amyl Alcohol to 20˚C|||<br><br><br>|<br>|<br>O|||
|Automotive Brake Fluid|||<br>||||
|Beer|||<br>||||
|Butane<br>Carbon Dioxide(Dry)||||<br>||
|Citric Acid||||||
|Copper Sulphate(Sol.)<br>Compressed Air<br>CuttingOil|||<br><br><br>||||
|Diesel Oil||||||
|Detergent Solution||||||
|Fuel Oil||||||
|Glycol<br>Hydraulic Oil||||<br>||
|Hydrogen||||||
|LubricatingOil||||||
|Milk<br>Mineral Oil|||<br><br>O|||
|Natural Gas<br>Oxygen to 70˚C||||<br>||
|Petrol||||||
|PlatingSolution(Chrome)<br>Salt Water|||<br><br>|<br>||||
|Sewage||||||
|Turpentine<br>Vinegar<br>Water|||<br><br><br>||||
|= Recommended<br>= Suitable with modifications<br><br>O||||||



## **Other Information** 

|Withstandpressure<br>Settingaccuracywhen set b<br>Temperature range<br>Diaphragm|Withstandpressure<br>Settingaccuracywhen set b<br>Temperature range<br>Diaphragm|Withstandpressure<br>Settingaccuracywhen set b<br>Temperature range<br>Diaphragm|when set byherga|when set byherga|when set byherga|500 PSI(34.5 Bar)<br>± 10%<br>-5˚C to +70˚C<br>Fabric reinforced Nitrile|500 PSI(34.5 Bar)<br>± 10%<br>-5˚C to +70˚C<br>Fabric reinforced Nitrile|500 PSI(34.5 Bar)<br>± 10%<br>-5˚C to +70˚C<br>Fabric reinforced Nitrile|Acetone<br>Ammonia(Liquid)<br>Amyl Alcohol to 20˚C<br>Automotive Brake Fluid<br>Beer|||||<br><br><br><br><br>|<br>|<br>O<br>|<br>||<br><br><br><br><br>|<br>|<br>O<br>|<br>||<br><br><br><br><br>|<br>|<br>O<br>|<br>||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Weight||||||300g|||Butane<br>Carbon Dioxide(Dry)||||||<br>||
|**Silver Contact Microswitch Data**|||||||||Citric Acid||||||||
|Average Life<br>Expectancy|Mechanical<br>Electrical||||2.0 x 10|1.0 x 106<br>2.0 x 105@ 10A<br>1.0 x 104@ 21A|||Copper Sulphate(Sol.)<br>Compressed Air<br>CuttingOil|||||<br><br><br>||||
|Electrical Rating||||||Max. Electrical Load|||Diesel Oil||||||||
|||Voltage<br>250V|||Res.<br>21A|Ind.|(Pf 0.75 Motor)||Detergent Solution<br>Fuel Oil||||||<br>||
|AC||250V|||21A|8A||1HP<br>2HP|Glycol<br>Hydraulic Oil||||||<br>||
|||125V|||21A||||Hydrogen||||||||
|||6V|||21A|21A|||LubricatingOil||||||||
|||12V|||15A|15A|||Milk<br>Mineral Oil|||||<br><br>O|||
|||24V|||8A|7A|||Natural Gas||||||||
|DC||60V|||1A|0.5A|||Oxygen to 70˚C||||||||
||||||||||Petrol||||||||
|||110V<br>220V|||0.5A<br>0.25A|0.2A<br>0.1A|||PlatingSolution(Chrome)<br>Salt Water|||||<br><br>|<br>||||
|**Gold Contact Microswitch Data**|||||||||Sewage||||||||
|Average Life<br>Expectancy|Mechanical<br>Electrical||||1.0 x 1.06<br>2.0 x 105@ 10A<br>1.0 x 104@ 21A||||Turpentine<br>Vinegar<br>Water|||||<br><br><br>||||
|Electrical Rating||||||Max. Electrical Load|||= Recommended|= Suitable with modifications<br><br>O|||||||
|||Voltage|||Res.|Ind.|(Pf 0.75 Motor)||||||||||
|AC||250V|||0.1A|0.05||N/A|**Note:** Dry Switching - if switching low power circuits, low current (4 to||||||||
|UL/CSA Only||125V|||0.1A|-----||-----|100 milliamperes) and low voltage (below 30V), consult herga or refer|||||100 milliamperes) and low voltage (below 30V), consult herga or refer|||
||||||||||to gold contact in section 4 of the opposite page.||to gold contact in section 4 of the opposite page.||||||
|Switch Standards:||EN 60730, EN 61058 and UL 508|||||||||||||||
||||||||||Herga do not accept liability for any pressure operated device used||Herga do not accept liability for any pressure operated device used|||||Herga do not accept liability for any pressure operated device used|
|Approvals Available:<br>CE, BEAB, CSA, DEMCO, IMQ, KEMA, NEMCO,|||CE, BEAB, CSA, DEMCO, IMQ, KEMA, NEMCO,|||CE, BEAB, CSA, DEMCO, IMQ, KEMA, NEMCO,|||outside the pressure range specified by the company.||||||||
|||OVE, SEMCO, SET I, SEV, UL, VDE||OVE, SEMCO, SET I, SEV, UL, VDE|||||||||||||
|1999||||**FOR FURTHER INFORMATION TEL: +44 (0)1284 701422  FAX: +44 (0)1284 753112**||||**FOR FURTHER INFORMATION TEL: +44 (0)1284 701422  FAX: +44 (0)1284 753112**|**FOR FURTHER INFORMATION TEL: +44 (0)1284 701422  FAX: +44 (0)1284 753112**||||**FOR FURTHER INFORMATION TEL: +44 (0)1284 701422  FAX: +44 (0)1284 753112**ISSUE 01||||



**Note:** Dry Switching - if switching low power circuits, low current (4 to 100 milliamperes) and low voltage (below 30V), consult herga or refer to gold contact in section 4 of the opposite page. 

Herga do not accept liability for any pressure operated device used outside the pressure range specified by the company. 

As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. 

**6773 ~ Double Diaphragm Pressure Switch** 

## **Benefits** 

- O Specified to EN 60335-2-60 double insulated for water detection 

- O Gold contacts available 

O Other pressures available up to 10 PSI O Various microswitch options O Multiple cap and spout options available **6773 A A 1. Model Number 2. Pressure Range** A 250mm H2O to 760mm H2O Standard **3. Caps** A Side Entry Std Spout Std Orientation 4.0mm Spout DBC Side Entry Std Spout Rotated 270Side Entry Std Spout Rotated 90Side Entry Std Spout Rotated 180˚ Viewed From Cap 4.0mmØ Spout˚˚ Viewed From Cap 4.0mmØ Spout Viewed From Cap 4.0mmØ Spout E Side Entry Long Spout 4.0mmØ Std Orientation FG Side Entry Long Spout Rotated 90Side Entry Long Spout Rotated 180˚ Viewed From Cap 4.0mmØ Spout˚ Viewed From Cap 4.0mmØ Spout H Back Entry Short Thread 4.0mmØ Spout. Not suitable for ‘O’ ring J Back Entry Long Thread 4.0mmØ Spout K Back Entry Long Thread 2.0mmØ Spout L Long Thread Spout Rotated @ 90˚ 4.0mmØ Spout **4. Bleed** A No Bleed Cap J With Bleed Cap **5. Nut Specification** A Black Moulded Nut B Black Moulded Nut and ‘O’ Ring (only available with options 3J, K & L above) **6. Authority** A European Tag Configuration **7. Terminal Combinations** A 3 Blade QC 6.3mm x 0.8mm B 2 Blade QC 6.3mm x 0.8mm Normally Open Contacts C 2 Blade QC 6.3mm x 0.9mm 90˚ Crank Normally Open Contacts **8. Microswitch Rating** A 0.1A 125/250V ac Gold Contacts (not available with option 7c) B 10A 1/4 HP 125/250V ac C 21A 250V ac 1 HP 125V ac 2 HP 250V ac ~~|~~ 1999 **FOR FURTHER INFORMATION TEL: +44 (0)1284 701422  FAX: +44 (0)1284 753112** ISSUE 01 

As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. 

**6761 & 6763 ~ Low Air Pressure Vacuum Switches (slow make contacts)** 

## **Benefits** 

- O A range of small switches designed for direct mounting onto printed circuit boards 

- O UL versions available 

- O Various spout orientations available 

- O Double diaphragm versions available upon request 

- O Available with base or side tube entry 

- O Silver or gold contact options 

- O Switches can be factory set within specified tolerances O 'O' ring seals available for dust and water tight applications, back entry versions only 

## **Printed Circuit Board Mounting Switches** 

**Model No 6761 (Vacuum)** Pressure/Vacuum range Minimum 150mm (6 ins) Wg Maximum 670 millibar (9.8) PSI Maximum Differential Approximately 0.06 ins WG Pressure/Vacuum Range Adjustable variants Body Withstand Pressure 2.7 Bar (40) PSI Air Bleed Version Available upon request Flow Rate Litre / Min (with air bleed) 8 - 30cc/Min @ 31 ins WG Pressure Connection 4mm Ø 

## **6763 (Pressure)** 

150mm (6 ins) Wg 150mm (6 ins) Wg 670 millibar (9.8) PSI 1.0 Bar (14.7) PSI Approximately 0.06 ins WG Approximately 0.06 ins WG Adjustable variants Adjustable variants 2.7 Bar (40) PSI 2.7 Bar (40) PSI Available upon request Available upon request 8 - 30cc/Min @ 31 ins WG 8 - 30cc/Min @ 31 ins WG 4mm Ø spout for side and back entry 4mm Ø spout for side and back entry 2mm Ø spout for back entry only 2mm Ø spout  for back entry only Lower spout ‘V’ vacuumpout ‘V’ vacuumout ‘V’ vacuum Upper spout ‘P’ pressure 4mm spout = 2311-01 or 2311-08 4mm spout = 2311-01 or 2311-08 2mm spout = 2311-03 2mm spout = 2311-03 -10˚C to 85˚C (Flow Solder 220˚C for 5 Sec) -10˚C to 85˚C (Flow Solder 220˚C for 5 Sec) 

4mm Ø spout for side and back entry 2mm Ø spout for back entry only Lower spout ‘V’ vacuumpout ‘V’ vacuumout ‘V’ vacuum 4mm spout = 2311-01 or 2311-08 2mm spout = 2311-03 

Connecting Tube Reference 

Temperature Range **Electrical Data** Switch Contact Rating Maximum UL 

Single Pole Normally Open 0.5A RES 250V ac (Silver contacts) 50mA RES 250V ac 

Single Pole Normally Open 0.5A RES 250V ac (Silver Contacts) 50mA RES 250V ac 

(Maximum ratings may not be achieved at low pressure settings) Dry Switching Maximum Recommended Current 10mA 24V dc (UL) 10mA 24V dc (UL) Body Glass filled polyester Glass filled polypolyolyyester Diaphragm Silicone as standard Contacts Silver or gold plated copper pins Mechanical Life 1 x 10[6] cycles 1 x 10[[6]] cyclesyclescles Weight (grams) 8grms 8grms 

10mA 24V dc (UL) Glass filled polypolyolyyester Silicone as standard Silver or gold plated copper pins 1 x 10[[6]] cyclesyclescles 8grms 

## **6761/6763 Vacuum and Pressure Switch Range** 

A miniature, compact low pressure switch designed for direct fitting by solder pins to printed circuit boards. Both vacuum and pressure ports are provided making the unit ideal for differential switching. Typical applications are indicators, emergency cut-out and alarms, filter and low pressure/vacuum monitoring. The switch is made to order for specific applications, the actual operating pressures or vacuum being set during production. However, final adjustment may be made after installation by the slotted screw in the base. The body construction allows the two ports to be set at any angle to each other. 

Non Std shown as 270˚ 

1999 **FOR FURTHER INFORMATION TEL: +44 (0)1284 701422  FAX: +44 (0)1284 753112** ISSUE 01 As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. 

**6741 / 6742 ~ Medium Pressure Switches** 

## **Benefits** 

O Switches set to specific rising or falling pressures O UL recognised versions available O High performance repeatability 

- O Single or double pole switching O Customised settings available upon request O Various connector options available 

## **Silver Contact Microswitch Data** 

|Average Life<br>Expectancy|Mechanical|1.0 x 106|1.0 x 106|1.0 x 106|
|---|---|---|---|---|
||Electrical|2.0 x 105 @ 10A<br>1.0 x 104 @ 21A|||
|Electrical Rating<br>Voltage||Max. Electrical Load|||
||Voltage|Res.|Ind.|(Pf 0.75 Motor)|
|AC|250V<br>250V<br>125V|21A<br>21A<br>21A|8A|1HP<br>1HP|
|DC|6V<br>12V<br>24V<br>60V<br>110V<br>220V|21A<br>15A<br>8A<br>1A<br>0.5A<br>0.25A|21A<br>15A<br>7A<br>0.5A<br>0.1A<br>0.1A||



|**Model No**|**6742-20/30/40/50/60**|**6742-70/80/90**|
|---|---|---|
|Electrical Switch Data|2 Pole change over|2 Pole Change over|
|Contact Rating|21 (8) A 250V ac|21 (8) A 250V ac|
|Pressure Connection|Brass1/8" BSPT|Brass1/8" BSPT|
|Setting Accuracy|± 10% as standard|± 10% as standard|
|Withstand Pressure|25 PSI or x 2|150 PSI 10 Bar|
|Temperature Range|-5˚C to + 70˚C|-5˚C to + 70˚C|
|Body Material|Nylon 12|Nylon 12|
|||Nitrile fabric|
|Diaphragm|Neoprene|reinforced fitted in<br>brass pressure|
|||capsule|
|Spring|Spring steel|Spring steel|
|Weight|50gm|85gm|



## **Gold Contact Microswitch Data** 

|Average Life<br>Expectancy|Mechanical|1.0 x 106|1.0 x 106|1.0 x 106|
|---|---|---|---|---|
||Electrical|2.0 x 106 @ 10A<br>1.0 x 104 @ 21A|||
|Voltage<br>Electrical Rating||Max. Electrical Load|||
||Voltage|Res.|Ind.|(Pf 0.75 Motor)|
|AC|250V|0.1A|0.05|N/A|
|UL/CSA Only|125V|0.1A|-----|-----|



Switch Standards: EN 60730, EN 61058 and UL 508 

Approvals Available: CE, BEAB, CSA, DEMCO, IMQ, KEMA, NEMCO, OVE, SEMCO, SET I, SEV, UL, VDE 

|**Model No**|**P.S.I**<br>**Bar**<br>**Pressure Range**|**P.S.I**<br>**Bar**<br>**Pressure Range**|**Differential**<br>**(Fixed)**|
|---|---|---|---|
|6742-20|1.5 - 3.5|0.10 - 0.24|See chart 1|
|6742-30|3.0 - 5.5|0.20 - 0.37|See chart 1|
|6742-40|5 - 10|0.34 - 0.68|See chart 1|
|6742-50|8 - 18|0.54 - 1.22|See chart 2|
|6742-60|16 - 30|1.08 - 2.04|See chart 2|
|6742-70|25 - 55|1.70 - 3.79|See chart 3|
|6742-80|45 - 75|3.1 - 5.17|See chart 3|
|6742-90|60 - 120|4.14 - 8.27|See chart 3|



## **Special options are available for quantity orders** 

## **NB** 

Herga do not accept liability for any pressure operated device used outside the pressure range specified by the company. 

O Diaphragms in silicon rubber, nitrile, EPDM O Switches with wide or close differentials 

- O Springs in stainless steel 

- O NPT connectors available 

1999 **FOR FURTHER INFORMATION TEL: +44 (0)1284 701422  FAX: +44 (0)1284 753112** ISSUE 01 As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. 

## **6741 / 6742 ~ Medium Pressure Switches** 

## **Suitability for use with different operating media** 

**==> picture [501 x 654] intentionally omitted <==**

**----- Start of picture text -----**<br>
||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
|Chart 1|
|Bar|PSI|
|Pressure Medium|Diaphragms|0.7|10|
|6742/20/30/40|6742/70/80|
|Chemical Compatibility|
|50 & 60|& 90|0.6|
|Acetone|O|LO|g|
|Ammonia (Liquid)Amyl Alcohol to 20˚C|imOo|LJO|0.5|
|Automotive Brake Fluid|im|C|0.4|.|6472-40|
|Beer|OL|
|Benzyl AlcoholButane|xOo|0.3|4|6472-30|
|Carbon Dioxide - Dry|
|0.2|
|Citric Acid|
|Copper Sulphate (Sol.)|Oo|O|2|6472-20|
|Compressed Air|0.1|
|Cutting Oil|im|
|Diesel Oil|O|0|0|2                 4                 6                  8                 10     PSI|
|Detergent Solution|O|
|Fuel Oil|O|
|0          0.1         0.2        0.3         0.4         0.5         0.6         0.7     Bar|
|Glycol|
|Hydraulic Oil|Oo|
|Chart 2|
|Hydrogen|Bar|PSI|
|Lubricating Oil|im|30|
|Milk|Oo|Ol|2.0|
|Mineral Oil|O|
|Natural Gas|25|
|Nitric Acid (Dil.)|x|O|
|Oxygen to 70˚C|ids)|6472-60|
|Petrol|im|20|
|Plating Solution  (Chrome)|O|im|
|Salt Water|Oo|O|
|Sewage|im|ro,|5|
|Sulphur Dioxide|x|LU|
|Turpentine|O|
|Vinegar|Ol|||10|6472-50|
|Water|0.5|
|=|Recommended|5|FALLING PRESSURE|
|iw|
|O|=|Suitable with modification|5              10               15              20               25              30     PSI|
|x|=|Not suitable|
|40|0.5                      1.0                       1.5                      2.0        Bar|
|31.8|
|Chart 3|
|Bar|PSI|
|+|el|8|
|2mm|thick;|mounting;|plate|£4|d|110|
|Part|N°|3351-109|2|posts|&|holes|to|suit|7|
|for|6742-20|to 6742-60|N°|4|self|tap|screws|100|
|6472-90|
|Note:|I|3.28|
|Longer|screws|will|penetrate|¥|oOA|-~|0|6|||90|
|diaphragmpart|N°|Oo|2112-643-047chamber,|please Qty order 2|oN(|)|6|5|80a|
|4|60|6472-80|
|Alternative Pressure Connections|
|Y|1/8” NPT Pressure Connector|50|
|3|40|
|a|6472-70|
|Ww|[A|/ \|20|30|FALLING PRESSURE|
|Ceuy 7T|d|DZ|20     30     40      50      60     70      80     90      100   110    120|PSI|
|2             3            4             5            6             7            8|
|Bar|
|Non|standard|tube|connection|Back|entry|Back|entry|
|positions|for 4mm|@|spout|connection.|6.4mm|@ spout|4mm|@|spout|
|Not|recommended|for|pressure|Note:|Differentials are approximate|

**----- End of picture text -----**<br>


**Key:** = Recommended O = Suitable with modification x = Not suitable 

1999 **FOR FURTHER INFORMATION TEL: +44 (0)1284 701422  FAX: +44 (0)1284 753112** ISSUE 01 As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. 

**6731 / 6732 ~ Low Pressure Switches** 

## **Benefits** 

- O These switches have been designed primarily for the OEM manufacturer who requires low cost and high reliability 

- O UL recognised versions available 

- O The switches have excellent repeat accuracy 

- O Double pole switching available upon request 

- O Wide choice of microswitch options including tab configurations 

|**Model No**<br>Electrical Switch|Single Pole<br>change over<br>**6731-03**|Single Pole<br>change over<br>**6731-06**|Single Pole<br>change over<br>**6731-10**|
|---|---|---|---|
|Contact Rating|3(1)A 250V ac|10(3)A 250V ac|21(8)A 250V ac|
|Pressure|Side entry spout|Side entry spout|Side entry spout|
|Connection|4mm O/D|4mm O/D|4mm O/D|
|Setting Accuracy|± 10% as std|± 10% as std|± 10% as std|
|Withstand<br>Pressure|25 PSI|25 PSI|25 PSI|
|Body Material|Nylon 12|Nylon 12|Nylon 12|
|Diaphragm|Neoprene|Neoprene|Neoprene|
|Spring|Spring steel|Spring steel|Spring steel|
|Weight|50gm|50gm|50gm|



|**Model No**|**Inches Water**<br>**mm Water**<br>**Pressure Range**|**Inches Water**<br>**mm Water**<br>**Pressure Range**|**Differential**<br>**(Fixed)**|
|---|---|---|---|
|6731-03|1.5 - 7|40 - 180|See chart 1|
|6731-06|5 - 25|127 - 635|See chart 1|
|6731-10|20 - 55|510 - 1400|See chart 1|



## **Special options are available for quantity orders** 

- O Switches set to specific operating pressure, rising or falling 

- O Diaphragms in silicon rubber, nitrile, EPDM 

- O Switches with wide or close differentials 

- O Springs in stainless steel 

|Pressure Switches|Pressure Switches|6731-03|6731-03|6731-06|6731-06|6731-06|6731-10|6731-10|6731-10|
|---|---|---|---|---|---|---|---|---|---|
|Average Life<br>Expectancy|Mechanical|2 x 106||2 x 106|||1.0 x 106|||
||Electrical|0.2 x 106 @ 1A||0.2 x 106 @ 6A<br>50K @ 10A|||0.2 x 106 @ 10A<br>10K @ 21A|||
|Electrical Rating||Max Electrical Load||Max Electrical Load|||Max Electrical Load|||
||Voltage|Resistive|Inductive|Resistive|Inductive|Motor (Pf0.75)|Resistive|Inductive|Motor (Pf0.75)|
||125V|3A|1A|10A|10A|0.5HP|21A|15A|1HP|
|AC|250V|3A|1A|10A|10A|0.5HP|21A|15A|2HP|
|DC|6V|3A|1A|10A|10A||21A|21A||
||12V|3A|1A|5A|3A||15A|15A||
||24V|1A|0.5A|5A|3A||8A|7A||
||60V|1A|0.5A|1A|0.5A||1A|0.5A||
||110V|0.5A|0.2A|0.5A|0.2A||0.5A|0.2A||
||220V|0.25|0.1A|0.25A|0.1A||0.25A|0.1A||



**Note:** Dry Switching If switching low power circuits, low current (4 to 100 milliamperes) and low voltage (below 30V), consult herga for special switches. 

**NB** - Herga do not accept liability for any pressure operated device used outside the pressure range specified by the company. 

1999 **FOR FURTHER INFORMATION TEL: +44 (0)1284 701422  FAX: +44 (0)1284 753112** ISSUE 01 As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. 

**6731 / 6732 ~ Low Pressure Switches** 

## **Suitability for use with different operating media** 

|**Pressure Medium**|**Diaphragms**|**Diaphragms**|**Diaphragms**|
|---|---|---|---|
|Chemical Compatibility|6731<br>~~im~~|||
|Acetone|~~im~~|<br>~~im~~|~~im~~|
|Ammonia (Liquid)|~~im~~<br>LJ|<br>~~im~~<br>LJ|~~im~~<br>LJ|
|Ammonia (Liquid)<br>Amyl Alcohol to 20˚C|~~im~~|<br>~~im~~|~~im~~|
|Amyl Alcohol to 20<br>Automotive Brake Fluid|~~im~~<br>im|<br>~~im~~<br>im|~~im~~<br>im|
|Beer|~~a~~|<br>~~a~~|~~a~~|
|Benzyl Alcohol|~~a~~|||
|Benzyl Alcohol<br>Butane||||
|Carbon Dioxide-Dry||||
|Dry<br>Citric Acid|<br>~~|~~|||
|Copper Sulphate (Sol.)|~~|~~|<br>~~|~~|~~|~~|
|Copper Sulphate (Sol.)<br>Compressed Air||||
|Compressed Air<br>Cutting Oil||||
|Cutting Oil<br>Diesel Oil||||
|Detergent Solution||||
|Detergent Solution<br>Fuel Oil||||
|Glycol||||
|Glycol<br>Hydraulic Oil||||
|Hydraulic Oil<br>Hydrogen||||
|Hydrogen<br>Lubricating Oil|<br>~~|~~|||
|Milk|~~|~~|<br>~~|~~|~~|~~|
|Mineral Oil|<br>~~x~~|||
|Natural Gas|<br>~~x~~|||
|Nitric Acid (Dil.)|~~x~~|||
|Nitric Acid (Dil.)<br>Oxygen to 70˚C||||
|Oxygen to 70<br>Petrol|<br>~~LJ~~|||
|Plating Solution  (Chrome)|~~LJ~~<br>im|<br>~~LJ~~<br>im|~~LJ~~<br>im|
|Plating Solution  (Chrome)<br>Salt Water|~~LJ~~<br>im|<br>~~LJ~~<br>im|~~LJ~~<br>im|
|Sewage|<br>im|||
|Sewage<br>Sulphur Dioxide|x|||
|Sulphur Dioxide<br>Turpentine||||
|Vinegar|LJ|<br>LJ|LJ|
|Vinegar<br>Water||||



**Key:** = Recommended C = Suitable with modification = Not suitable 

**==> picture [241 x 218] intentionally omitted <==**

**----- Start of picture text -----**<br>
Chart 1<br>mm Wg in WG<br>60<br>1400<br>50<br>1200<br>1000 40<br>800 ew 6731-10<br>600<br>20<br>6731-06<br>400<br>10<br>200<br>6731-03 FALLING PRESSURE<br>0 0<br>0              10               20              30              40             50              60 in WG<br>0          200        400        600         800       1000      1200      1400 mm Wg<br>Max Differential Min Differential<br>RISING PRESSURE<br>**----- End of picture text -----**<br>


**Note:** Differentials are approximate 

1999 **FOR FURTHER INFORMATION TEL: +44 (0)1284 701422  FAX: +44 (0)1284 753112** ISSUE 01 As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. 

**6753 ~ Low Air Pressure / Vacuum Switches** 

## **Benefits** 

- O Sensitive versatile switch - ideal for long tube length applications 

   - O Bleed versions available for temperature compensation 

   - O Easily adjustable settings 

- O Normally open or normally closed contact configuration 

- O Ideal for switching low power circuits 

**==> picture [34 x 12] intentionally omitted <==**

**----- Start of picture text -----**<br>
6753<br>**----- End of picture text -----**<br>


- O Custom pressure, vacuum and bleed settings available upon request 

**==> picture [77 x 12] intentionally omitted <==**

**----- Start of picture text -----**<br>
0 0 0<br>**----- End of picture text -----**<br>


**1. Model Number** 

**2. Operation** A Normally Open - Pressure 

   - B Normally Closed - Vacuum 

**3. Bleed Adjuster Options** A Bleed A side only, Vacuum N/O to N/C, Pressure N/C to N/O B Bleed B side only, Vacuum N/O to N/C, Pressure N/C to N/O C Bleed both sides Vacuum / Pressure D No bleed variant either side Vacuum / Pressure 

**4. Bleed Setting** A 100 - 300 cc/Min Factory Setting J No bleed setting 

**5. Pressure Setting** A 2.25" WG ± 0.5" Std B 2" WG ± 0.5" C 3" WG ± 0.5" D 4" WG ± 0.5" E 6" WG ± 10% F 8" WG ± 10% G 10" WG ± 10% H 12" WG ± 10% J 14" WG ± 10% K 16" WG ± 0 - 10% 

**6. Packaging Options** A Vacuum Form Tray (100 off volumes - ideal for OEM applications) B Poly Bag (individual) 

1999 **FOR FURTHER INFORMATION TEL: +44 (0)1284 701422  FAX: +44 (0)1284 753112** ISSUE 01 As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. 

**6753 ~ Low Air Pressure / Vacuum Switches** 

**==> picture [148 x 46] intentionally omitted <==**

## **Technical Data** 

|Pressure/Vacuum range minimum <br>maximum|25mm (1 in) Wg<br>400mm(16 ins)Wg|
|---|---|
|Maximum Differential|400mm (16 ins) Wg|
|Pressure<br>Standard Factory Setting|50mm (2.25 ins) Wg<br>(Contacts Normally Open) Other<br>settings available see note2)|
|Maximum Differential Between<br>Pressure Connection|0.34 Bar (5 PSI)|
|BodyWithstand Pressure|1.0 Bar (14.7 PSI)|
|Air Bleed Version|See choice options 3 & 4, other<br>settings available, see note3)|
|Flow Rate Litre / Min|Standard 100 - 300 cc/Min<br>@ 5 PSI|
|Connection Position|Base    see note2)|
|Pressure Connection|4mm dia spouts<br>For reducing connectors, please<br>refer to accessories page|
|Connecting Tube Reference|2311-08 or 2311-01|
|Temperature Range|-5˚C to 50˚C|



## **Electrical Data** 

|**Electrical Data**||
|---|---|
|Switch|Single pole, N/Open / N/Closed|
|Contact Rating Maximum|0.5A RES 250V ac<br>(Maximum ratings may not be<br>achieved at low pressure<br>settings)|
|Dry Switching Minimum Current|5mA 4V dc|
|Body|Glass filled nylon 12|
|Diaphragm|Neoprene|
|Contacts|Gold plated silver mounted on<br>phosphor-bronze blades|
|Contact Resistance|0.05 Ohms|
|Mechanical Life|1 x 106 cycles|
|Weight (grams)|10grms|



## **6753 Pressure Switch Range** 

## **For very sensitive pressure, vacuum and differential pressure switching.** 

The 6753 range of switches provide a high specification in a small, versatile body shell. Great care has been taken in the switch unit design, keeping the moving mass and therefore inertia to a minimum. This means that it can operate at a high cycle rate with low pressure, vacuum or pressure differential. This design feature can be used when measuring pressure pulses such as on component counting applications and used with herga Safe Edges. The switch will operate very rapidly keeping the switch delay to a minimum. 

- 1) For good repeatable switching, the contacts are gold plated on solid silver. The electrical rating of the switch is dependent on the contact pressure. This pressure is dependent on the air pressure. Thus, for very sensitive setting the permissible switching current will be lower than normal. 

- 2) The standard switch can be adjusted to give normally closed or normally open contacts depending on the application. For operation on pressure with normally closed contacts, connect to air connection ‘A’ and screw in sensitivity adjusting screw ‘S’ until contacts are normally closed. For operation on pressure with normally open contacts, connect to air connection ‘B’ and set with contacts normally open. 

- 3) A separate version, (see bleed options), is provided with adjustable air bleeds on both sides of the diaphragm. These air bleeds are adjusted to a level which is suitable for most applications involving safe edges or elbows, and prevent pressure or vacuum building up inside when the ambient temperature or atmospheric pressure changes. 

1999 **FOR FURTHER INFORMATION TEL: +44 (0)1284 701422  FAX: +44 (0)1284 753112** ISSUE 01 As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. 

**6721 / 6722 ~ Vacuum Switches** 

## **Benefits** 

O These switches have been designed primarily for the OEM manufacturer who requires low cost and high reliability 

O UL recognised versions available 

O The switches have excellent repeat accuracy O Double pole switching available upon request O Wide choice of microswitch options available including tab configurations 

|**Model No**<br>Electrical Switch<br>Data<br>Contact Rating<br>Vacuum|Single Pole<br>change over<br>3(1)A 250V ac<br>Side entry spout<br>**6721-03**|Single Pole<br>change over<br>10(3)A 250V ac<br>Side entry spout<br>**6721-06**|Single Pole<br>change over<br>10(3)A 250V ac<br>Side entry spout<br>**6721-06**|Single Pole<br>change over<br>21(8)A 250V ac<br>Side entry spout<br>**6721-20/30/40**|||**Inches Water**<br>**mm Water**<br>6721-03<br>3 - 8<br>75 - 200<br>6721-06<br>7 - 15<br>180 - 380<br>**Model No**<br>**Vacuum Range**|See chart 1<br>See chart 1<br>**Differential**<br>**(Fixed)**|
|---|---|---|---|---|---|---|---|---|
|Connection|4mm O/D|4mm O/D||4mm O/D|||6721-20<br>13 - 32<br>330 - 810|See chart 1|
|Setting Accuracy|± 10% std|± 10% std||± 10% std|||6721-30<br>28 - 80<br>710 - 2030|See chart 2|
|Temperature<br>Range|-5˚C to + 70˚C|-5˚C to + 70˚C||-5˚C to + 70˚C|||6721-40<br>75 - 270<br>1900 - 6860|See chart 2|
|Body Material|Nylon 12|Nylon 12||Nylon 12||**Special options are available for quantity orders**|||
|Diaphragm|Neoprene|Neoprene||Neoprene||O<br>O|Switches set to specific operating vacuum, rising or falling<br>Diaphragms in silicon rubber, nitrile, EPDM||
|Spring (in<br>Vacuum Cavity)|Spring steel<br>1)|Spring steel|1)|Spring steel<br>1)||O<br>O|Switches with wide or close differentials<br>Springs in stainless steel||



|**Model No**|**Inches Water**<br>**mm Water**<br>**Vacuum Range**|**Inches Water**<br>**mm Water**<br>**Vacuum Range**|**Differential**<br>**(Fixed)**|
|---|---|---|---|
|6721-03|3 - 8|75 - 200|See chart 1|
|6721-06|7 - 15|180 - 380|See chart 1|
|6721-20|13 - 32|330 - 810|See chart 1|
|6721-30|28 - 80|710 - 2030|See chart 2|
|6721-40|75 - 270|1900 - 6860|See chart 2|



**Note:** The spring is fitted in the vacuum cavity in contact with the media 

|Pressure Switches|Pressure Switches|6731-03|6731-03|6731-06|6731-06|6731-06|6731-10|6731-10|6731-10|
|---|---|---|---|---|---|---|---|---|---|
|Average Life<br>Expectancy|Mechanical|2 x 106||2 x 106|||1.0 x 106|||
||Electrical|0.2 x 106 @ 1A||0.2 x 106 @ 6A<br>50K @ 10A|||0.2 x 106 @ 10A<br>10K @ 21A|||
|Electrical Rating||Max Electrical Load||Max Electrical Load|||Max Electrical Load|||
||Voltage|Resistive|Inductive|Resistive|Inductive|Motor (Pf0.75)|Resistive|Inductive|Motor (Pf0.75)|
||125V|3A|1A|10A|10A|0.5HP|21A|15A|1HP|
|AC|250V|3A|1A|10A|10A|0.5HP|21A|15A|2HP|
|DC|6V|3A|1A|10A|10A||21A|21A||
||12V|3A|1A|5A|3A||15A|15A||
||24V|1A|0.5A|5A|3A||8A|7A||
||60V|1A|0.5A|1A|0.5A||1A|0.5A||
||110V|0.5A|0.2A|0.5A|0.2A||0.5A|0.2A||
||220V|0.25A|0.1A|0.25A|0.1A||0.25A|0.1A||



**Note:** Dry Switching If switching low power circuits, low current (4 to 100 milliamperes) and low voltage (below 30V), consult herga for special switches. 

**NB** - Herga do not accept liability for any vacuum operated device used outside the pressure range specified by the company. 

1999 **FOR FURTHER INFORMATION TEL: +44 (0)1284 701422  FAX: +44 (0)1284 753112** ISSUE 01 As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. 

**6721 / 6722 ~ Vacuum Switches** 

## **Suitability for use with different operating media** 

**==> picture [447 x 403] intentionally omitted <==**

**----- Start of picture text -----**<br>
|||||||
|---|---|---|---|---|---|
|Suitability for use with different operating media|-50          -40          -30           -20          -10          0|
|Hg|
|Vacuum Medium|Diaphragms|WG|In|-30        -25         -20         -15        -10          -5         0|0|
|Chemical Compatibility|6721|REDUCING VACUUM|
|6721-03|
|Acetone|U|5|
|Ammonia (Liquid)Amyl Alcohol to 20˚C|im|L]|6721-06|10|
|Automotive Brake Fluid|oO|
|Beer|L|15|
|Benzyl Alcohol|x|
|6721-20|
|Butane|
|20|
|Carbon Dioxide - Dry|
|Citric Acid|
|Copper Sulphate (Sol.)|im|25|
|Compressed Air|
|30|
|Cutting Oil|
|In|
|Diesel Oil|Chart 1|WG|
|Detergent Solution|
|Fuel Oil|mm|-400   -350    -300   -250    -200   -150   -100     -50|
|Hg|
|Glycol|
|In|
|Hydraulic Oil|WG|-225  -200   -175  -150   -125  -100   -75     -80    -25  -1|
|25|
|Hydrogen|REDUCING VACUUM|
|Lubricating Oil|
|Milk|6721-30|
|im|075|||
|Mineral Oil|
|Natural Gas|-100|
|Nitric Acid (Dil.)Oxygen to 70˚C|x|6721-40|“125|
|Petrol|-150|
|Plating Solution  (Chrome)|LJ|
|Salt Water|
|O|175|
|Sewage|-200|
|Sulphur Dioxide|x|pos|||
|Turpentine|
|Vinegar|O|-250|
|Water|
|-275|
|In|
|=|Recommended|Chart 2|WG|
|LC]|=|Suitable with modification|
|x|Note:|Differentials are approximate|

**----- End of picture text -----**<br>


## **Key:** = Recommended 

= Not suitable 

**==> picture [163 x 22] intentionally omitted <==**

**----- Start of picture text -----**<br>
Alternative Vacuum Connections<br>Back entry [1] /8” BSPT and NPT Connectors<br>**----- End of picture text -----**<br>


1999 **FOR FURTHER INFORMATION TEL: +44 (0)1284 701422  FAX: +44 (0)1284 753112** ISSUE 01 As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. 

## **Pressure Conversion Table** 

**==> picture [148 x 46] intentionally omitted <==**

|P.S.I|P.S.I|in/H20|in/Hg|mm/H20|mm/Hg|kg/cm2|bar|mbar|Pa|kPa||P.S.I|in/H20|in/Hg|mm/H20|mm/Hg|kg/cm2|bar|mbar|mbar|Pa|kPa|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
||1.0|27.71|2.036|703.1|51.75|.0703|.0689|68.95|6895|6.895||5.6|155.0|11.40|3937|289.6|.3937|.3861|386.1||38610|38.61|
||1.1|30.45|2.240|773.4|56.89|.0773|.0758|75.84|7584|7.584||5.7|157.8|11.60|4008|294.8|.4007|.3930|393.0||39300|39.30|
||1.2|33.22|2.443|843.7|62.06|.0844|.0827|82.74|8274|8.274||5.8|160.5|11.81|4078|299.9|.4078|.3999|399.9||39990|39.99|
||1.3|35.98|2.647|914.0|67.23|.0914|.0896|89.63|8963|8.963||5.9|163.3|12.01|4148|305.1|.4148|.4068|406.8||40680|40.68|
||1.4|38.75|2.850|984.3|72.40|.0984|.0965|96.52|9652|9.652||6.0|166.1|12.22|4218|310.3|.4218|.4137|413.7||41370|41.37|
||1.5|41.52|3.054|1055|77.57|.1055|.1034|103.4|10340|10.34||6.1|168.8|12.42|4289|315.5|.4289|.4206|420.6||42060|42.06|
||1.6|44.29|3.258|1125|82.74|.1125|1103|110.3|11030|11.03||6.2|171.6|12.62|4359|320.6|.4359|.4275|427.5||42750|42.75|
||1.7|47.06|3.461|1195|87.92|.1195|.1172|117.2|11720|11.72||6.3|174.4|12.83|4429|325.8|.4429|.4344|434.4||43440|43.44|
||1.8|49.82|3.665|1266|93.09|.1266|1241|124.1|12410|12.41||6.4|177.2|13.03|4500|331.0|.4500|.4413|441.3||44130|44.13|
||1.9|52.59|3.868|1336|98.26|.1336|1310|131.0|13100|13.10||6.5|179.9|13.23|4570|336.1|.4570|.4482|448.2||44820|44.82|
||2.0|55.36|4.072|1406|103.4|.1406|.1379|137.9|13790|13.79||6.6|182.7|13.44|4640|341.3|4640|.4550|455.0||45500|45.50|
||2.1|58.13|4.276|1476|108.6|.1476|.1448|144.8|14480|14.48||6.7|185.5|13.64|4711|346.5|.4710|.4619|461.9||46190|46.19|
||2.2|60.90|4.479|1547|113.8|.1547|.1517|151.7|15170|15.17||6.8|188.2|13.84|4781|351.7|.4781|.4688|468.8||46880|46.88|
||2.3|63.67|4.683|1617|118.9|.1617|.1586|158.6|15860|15.86||6.9|191.0|14.05|4851|356.8|.4851|.4757|475.7||47570|47.57|
||2.4|66.43|4.886|1687|124.1|.1687|.1655|165.5|16550|16.55||7.0|193.8|14.25|4922|362.0|.4921|.4826|482.6||48260|48.26|
||2.5|69.20|5.090|1758|129.3|.1758|.1724|172.4|17240|17.24||7.1|196.5|14.46|4992|367.2|.4992|.4895|489.5||48950|48.95|
||2.6|71.97|5.294|1828|134.5|.1828|.1793|179.3|17930|17.93||7.2|199.3|14.66|5062|372.3|.5062|.4964|496.4||49640|49.64|
||2.7|74.74|5.497|1898|139.6|.1898|.1862|186.2|18620|18.62||7.3|202.1|14.86|5132|377.5|.5132|.5033|503.3||50330|50.33|
||2.8|77.51|5.701|1969|144.8|.1968|.1930|193.0|19300|19.30||7.4|204.8|15.07|5203|382.7|.5203|.5102|510.2||51020|51.02|
||2.9|80.27|5.904|2039|150.0|.2039|.1999|199.9|19990|19.99||7.5|207.6|15.27|5273|387.9|.5273|.5171|517.1||51710|51.71|
||3.0|83.04|6.108|2109|155.1|.2109|.2068|206.8|20680|20.68||7.6|210.4|15.47|5343|393.0|.5343|.5240|524.0||52400|52.40|
||3.1|85.81|6.312|2180|160.3|.2180|.2137|213.7|21370|21.37||7.8|215.9|15.88|5484|403.4|.5484|.5378|537.8||53780|53.78|
||3.2|88.58|6.515|2250|165.5|.2250|.2206|220.6|22060|22.06||8.0|221.4|16.29|5625|413.7|.5625|.5516|551.6||55160|55.16|
||3.3|91.35|6.719|2320|170.7|.2320|.2275|227.5|22750|22.75||8.2|227.0|16.70|5765|424.1|.5765|.5654|565.4||56540|56.54|
||3.4|94.11|6.922|2390|175.8|.2390|.2344|234.4|23440|23.44||8.4|232.5|17.10|5906|434.4|.5906|.5792|579.2||57920|57.92|
||3.5|96.88|7.126|2461|181.0|.2461|.2413|241.3|24130|24.13||8.6|238.0|17.51|6047|444.7|.6046|.5929|592.9||59290|59.29|
||3.6|99.65|7.330|2531|186.2|.2531|.2482|248.2|24820|24.82||8.8|243.6|17.92|6187|455.1|.6187|.6067|606.7||60670|60.67|
||3.7|102.4|7.533|2601|191.3|.2601|.2551|255.1|25510|25.51||9.0|249.1|18.32|6328|465.4|.6328|.6205|620.5||62050|62.05|
||3.8|105.2|7.737|2672|196.5|.2672|.2620|262.0|26200|26.20||9.2|254.7|18.73|6468|475.8|.6468|.6343|634.3||63430|63.43|
||3.9|108.0|7.940|2742|201.7|.2742|.2689|268.9|26890|26.89||9.4|260.2|19.14|6609|486.1|.6609|.6481|648.1||64810|64.81|
||4.0|110.7|8.144|2812|206.9|.2812|.2758|275.8|27580|27.58||9.6|265.7|19.54|6750|496.5|.6749|.6619|661.9||66190|66.19|
||4.1|113.5|8.348|2883|212.0|.2883|.2827|282.7|28270|28.27||9.8|271.3|19.95|6890|506.8|.6890|.6757|675.7||67570|67.57|
||4.2|116.3|8.551|2953|217.2|.2953|.2896|289.6|28960|28.96||10.0|276.8|20.36|7031|517.1|.7031|.6895|689.5||68950|68.95|
||4.3|119.0|8.775|3023|222.4|.3023|.2965|296.5|29650|29.65||11.0|304.5|22.40|7734|568.9|.7734|.7584|758.4||75840|75.84|
||4.4|121.8|8.958|3094|227.5|.3094|.3034|303.4|30338|30.34||12.0|332.2|24.43|8437|620.6|.8437|.8274|827.4||82740|82.74|
||4.5|124.6|9.162|2164|232.7|.3164|.3103|310.3|31030|31.03||13.0|359.8|26.47|9140|672.3|.9140|.8963|896.3||98630|89.63|
||4.6|127.3|9.366|3234|237.9|.3234|.3172|317.2|31720|31.72||14.0|387.5|28.50|9843|724.0|.9843|.9652|965.2||96520|96.52|
||4.7|130.1|9.569|3304|243.1|.3304|.3240|324.0|32400|32.40||14.7|406.9|29.93|10340|760.2|1.033|1.014|1014||101400|101.4|
||4.8|132.9|9.773|3375|248.2|.3375|.3310|331.0|33100|33.10||15.0|415.2|30.54|10550|775.7|1.055|1.034|1034||103400|103.4|
||4.9|135.6|9.976|3445|253.4|.3445|.3378|337.8|33780|33.78||16.0|442.9|32.58|11250|827.4|1.125|1.103|1103||110300|110.3|
||5.0|138.4|10.18|3515|258.6|.3515|.3447|344.7|34470|34.47||17.0|470.6|34.61|11950|879.1|1.195|1.172|1172||117200|117.2|
||5.1|141.2|10.38|3586|263.7|.3586|.3516|351.6|35160|35.16||18.0|498.2|36.65|12660|930.9|1.265|1.241|1241||124100|124.1|
||5.2|143.9|10.59|3656|268.9|.3656|.3585|358.5|35850|35.85||19.0|525.9|38.68|13360|982.6|1.336|1.310|1310||131000|131.0|
||5.3|146.7|10.79|3726|274.1|.3726|.3654|365.4|36540|36.54||20.0|553.6|40.72|14060|1034|1.406|1.379|1379||137900|137.9|
||5.4|149.5|10.99|3797|279.3|.3797|.3723|372.3|37230|37.23||25.0|692.0|50.90|17580|1293|1.758|1.724|1724||172400|172. 4|
||5.5|152.2|11.20|3867|284.4|.3867|.3792|379.2|37920|37.92||**Liquid**<br>MI = Millilitre<br>Fl oz = Fluid Ounce<br>1MI = 0.0352 Fl/oz<br>1 Litre = 0.21998 UK<br>Gallon<br>**Force**<br>N   = Newton<br>Lbf = Pounds force<br>Kgf = Kilogram force<br>1 N = 0.225Lbf<br>1 N = 0102Kgf||||||||**Weight**<br>Kg = Kilogram<br>Lb = Pound<br>1Kg = 2.2045Lb|||
||||||||||||||||||||||||



1999 **FOR FURTHER INFORMATION TEL: +44 (0)1284 701422  FAX: +44 (0)1284 753112** ISSUE 01 As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. 

**Certification Markings** 

**==> picture [148 x 46] intentionally omitted <==**

|**Country**<br>Australia<br>Austria<br>Belgium<br>Canada<br>Denmark<br>Europe<br>Finland<br>France<br>Germany<br>India<br>Ireland<br>Italy|**Agency**<br>SAA<br>OVE<br>CEBEC<br>CSA<br>DEMKO<br>MANY<br>FEI<br>UTE<br>VDE<br>ISI<br>IIRS<br>IMQ|**Mark**<br>**CEBEC**<br>**D**<br>**FI**|Japan<br>Netherlands<br>New Zealand<br>Norway<br>Republic of<br>South Africa<br>Sweden<br>Switzerland<br>United Kingdom<br>United States<br>**Country**|MITI<br>KEMA<br>SECV<br>SECQ<br>SECWA<br>EANSW<br>ETSA<br>HECT<br>SANZ<br>NEMKO<br>SABS<br>SEMKO<br>SEV<br>ASTA<br>BSI<br>BEAB<br>UL<br>**Agency**<br>**M**<br>**K**<br>**B**<br><br>®|**ark**<br>**EMA**<br>**EUR**<br><br> **S**<br>**BEAB**<br>or<br>**®**|
|---|---|---|---|---|---|



1999 **FOR FURTHER INFORMATION TEL: +44 (0)1284 701422  FAX: +44 (0)1284 753112** ISSUE 01 As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. 

## **Accessories: Switch Housings** 

## **Benefits** 

- O IP40 and IP67 Housings with rear fixing positions 

- O Variations of air or electrical connections 

- O Unlimited options available - contact herga with your requirements 

- O Back entry versions for pressure switch connections 

- O Available for all herga switching systems 

- O Custom designed labels and housing colours available for volume OEM requirements 

## **Part Number: 6819-00 Variants** 

## **Part Number: 6816-00 Variants** 

## **Part Number: 6819-01** 

The most economical and compact housing, produced especially for hergair switches.  Double insulated sealed enclosure is moulded in two tone black and white ABS as standard. The lid has an integral rubber sealing gasket and captive screws.  Mounting holes and lid fixing screws are outside the seal, thus preventing the ingress of moisture and making the box waterproof to IP65. 

The standard 6819-00 housing is supplied with a cable gland for cable diameter 5mm to 7mm and a type 6418-00 air tube connector is fitted. 

The housing is suitable for all airswitches except model 6806. 

Blue flexible PVC protective boot for air and pressure switch types 6721, 6731, 6741, 6861, 6863 and 6869. Covers all electrical connections and grips round outside of switch body. Can be used with cable 5mm to 9mm diameter. 

Diecast aluminium housing for airswitch types except 6806 models. Finished in blue stove enamel. Ideal for use where electrical screening is required. 

Other colour variants are available upon request as are specified fixing positions to suit your requirements. 

We recommend a cable restraint is used in connection with this part. 

Where a number of airswitches are to be fitted in one box, herga can supply a variety of special boxes complete with multi-way air connectors and electrical connections as required. **Note:** 

Herga can offer many other variants of electrical housings in size and colour up to IP67. We also manufacture world-wide (plug in) switch housings with or without cordsets in conjunction with our airswitching systems. Please contact us with your specific requirements **.** 

**FOR FURTHER INFORMATION TEL: +44 (0)1284 701422  FAX: +44 (0)1284 753112** ISSUE 01 

1999 

**Rapid Response Form (Photostat and fax back)** 

**==> picture [148 x 46] intentionally omitted <==**

It is our goal to give you a response within 24 hours. By completing this form it will help us to help you! Thank you. 

CUSTOMER CONTACT NAME TEL: FAX: ________________________________________________PRESSURE   ___________________________________________________VACUUM INDUSTRY: MEDICAL POOL & SPA CHEMICAL/PROCESS INDUSTRIAL OTHER ______________________ CLASSIFICATION:         OEM DISTRIBUTOR / RESELLER END USER OTHER __________________________________ REQUIREMENTS: __________________  PRESSURE.  __________________  VACUUM. _________________   DIFFERENTIAL PRESSURE. IF PRESSURE OR VACUUM MEASURED GAUGE (AS IN CATALOGUE) OR ABSOLUTE? ___________________________________________ ________________ INCHES WG _________________ PSI GAUGE    OPERATING RANGE: ______________TO____________±____________ HERGA TO SET WE WILL SET ON RISING ON FALLING MAX PRESSURE/VACUUM UNIT WILL BE SUBJECTED TO ___________________________ SETTING PREFERENCE ±__________________ MAX DIFFERENTIAL (DIFF. BETWEEN RISE & FALL) ________________________________ MIN DIFFERENTIAL _______________________ MEDIA GAS ___________________    TEMPERATURE ___________________     AMBIENT ___________________ TO ________________ LIQUID _________________    TEMPERATURE ____________________   MEDIA ___________________  TO ________________ ELECTRICAL:    VOLTS ______________ AC _______________/_______________ DC     MAX CURRENT:  AMPS___________HP___________ ______________ RESISTIVE ________________ INDUCTIVE    LOAD DESCRIPTION ______________________________________________ APPROVAL NEEDED:  UL CSA OTHER  _______________________________________________________________________ CONTACT CONFIGURATION: SINGLE POLE DOUBLE POLE GOLD CONTACT MECHANICAL:  MOUNTING PREFERENCE   1/8” BSPT BRASS 1/8” BSPT STAINLESS SIDE SPOUT CENTRE SPOUT 1/8” NPT BRASS 1/8” NPT STAINLESS PCB MOUNT OTHER ____________________________________________________ APPLICATION (WHAT WILL SWITCH CONTROL?) ________________________________________________________________________ ________________________________________________________________________ QUANTITY REQUIRED FOR PROTOTYPE? ___________________________________ REQUIRED DATE ________________________ ANNUAL PRODUCTION QUANTITY? ___________________________________ START DATE ___________________________ CURRENT SWITCH USED? ___________________________________ PRICE RANGE __________________________ ANY PROBLEMS WITH PRESENT UNIT? _____________________________________________________________________________ _____________________________________________________________________________ 1999 **FOR FURTHER INFORMATION TEL: +44 (0)1284 701422  FAX: +44 (0)1284 753112** ISSUE 01 As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale.