1910-00

Duyer 

Cee 

**SERIES 1900** 

COMPACT LOW DIFFERENTIAL PRESSURE SWITCHES Set Points from 0.07 to 20 in w.c. Repetitive Accuracy within 3% 

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1/8 FEMALE NPT<br>HIGH PRESS. CONNECTION 60° TYP<br>ee ~<br>3 (2) Ø3/16 [4.76]<br>[76.20] MOUNTING HOLES<br>1-5/16 ON A 4-3/16 [106.36] B.C.<br>[33.32]<br>r TYP (3 @l 1/8 FEMALE NPT<br>Ø3-1/2<br>LOW PRESSURE<br>[88.90] CONNECTION<br>41/64 Ø7/8 [22.23] 51/64<br>[16.27] 1-19/32 CONDUIT [20.24] 1-7/8<br>[40.48] CONNECTION [47.63]<br>2-11/32 1-3/4 [44.45] 2-9/32<br>[59.53] CLEARANCE [57.94]<br>FOR COVER REMOVAL 2-7/16<br>[61.90]<br>**----- End of picture text -----**<br>


## **Series 1910 switch with conduit enclosure off.** 

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Shows electric switch and set point adjustment screw located<br>VIDEOONLINE on same side for easy installation.<br>**----- End of picture text -----**<br>


**The Dwyer-engineered force-motion amplifier increases the leverage of diaphragm movement and results in a switch with excellent sensitivity and repeatability.** 

Our most popular **Series 1900 Compact Low Differential Pressure Switches** combine advanced design and precision construction to make these switches able to perform many of the tasks of larger, costlier units. Designed for air conditioning service, they also serve many fluidics, refrigeration, oven and dryer applications. Series 1900 switches have set points from 0.07 to 20 in w.c. (1.8 to 508 mm). Set point adjustment is easy with range screw located inside conduit enclosure. Internal location helps prevent tampering. UL, CE and CSA listed, and FM approved. For use with air or compatible gages. 

## **BENEFITS/FEATURES** 

- Compact size and repeatability, provides a high-value switch for many industrial and OEM applications 

- Wide range of models from 0.07 in w.c. to 20 in w.c. can meet exacting OEM specifications for a low pressure switch 

- Range screw protected inside enclosure provides simplifies making adjustments but prevents tampering 

## **APPLICATIONS** 

## **SPECIFICATIONS** 

**Service:** Air and non-combustible, compatible gases. 

**Wetted Materials:** Consult factory. **Temperature Limits:** -30 to 180°F (-34 to 82.2°C). 

**Pressure Limits:** 45 in w.c. (11.2 kPa) continuous, 10 psig (68.95 kPa) surge. **Switch Type:** Single-pole double-throw (SPDT). **Repeatability:** ±3%. 

**Electrical Rating:** 15 A @ 120-480 VAC, 60 Hz. Resistive 1/8 HP @125 VAC, 1/4 HP @ 250 VAC, 60 Hz. Derate to 10 A for operation at high cycle rates. **Electrical Connections:** 3 screw type, common, normally open and normally closed. 

**Process Connections:** 1/8˝ female NPT. 

**Mounting Orientation:** Diaphragm in vertical position. Consult factory for other position orientations. 

**Set Point Adjustment:** Screw type inside conduit enclosure. **Weight:** 1 lb 4.5 oz (581 g). 

**Compliance:** CE, CSA, FM, and UL. Optional-EXPL explosion-proof enclosure does not possess any compliance. 

- Air conditioning refrigeration coil icing detection; defrost cycle initiation 

- Clogged filter detection 

- Variable air volume controller 

|**MODEL CHART**|**MODEL CHART**|**MODEL CHART**|**MODEL CHART**|
|---|---|---|---|
|**Model**|**Operating Range in w.c.**|**Approximate Deadband**||
|||**At Min. Set Point**|**At Max. Set Point**|
|**1910-00**<br>**1910-0**<br>**1910-1**<br>**1910-5**<br>**1910-10**<br>**1910-20**|0.07 to 0.15<br>0.15 to 0.5<br>0.40 to 1.6<br>1.40 to 5.5<br>3.0 to 11.75<br>4.0 to 20.0|0.04<br>0.10<br>0.15<br>0.30<br>0.40<br>0.40|0.04<br>0.10<br>0.16<br>0.30<br>0.40<br>0.50|



|**ACCESSORIES**|**ACCESSORIES**|
|---|---|
|**Model**|**Description**|
|**A-302F-A**<br>**A-329**<br>**A-399**<br>**A-489**|303 SS static pressure tip with mounting flange; for 3/16˝ ID rubber or<br>plastic tubing; 4˝ insertion depth; includes mounting screws<br>Street ell; brass adaptor for applications requiring right angle<br>connections; two required for differential pressures<br>Duct pressure monitor kit; for use with standard or manual reset model<br>switches; includes mounting flange, tubing and adapters<br>4˝ straight staticpressure tipwith flange|



## **OPTIONS** 

## **Weatherproof Housing** 

16 ga. steel enclosure with gasketed cover (NEMA 4, IP66) for wet or oily conditions. Withstands 200 hour salt spray test. Wt. 5-1/2 Ib (2.5 kg). Switch must be factory installed. 

**Note:** To order, change 1910 base number to 1911, add -WP suffix. **Example:** 1911-1-WP 

## **Explosion-Proof Housing** 

Cast iron base with brass cover. Rated Class I, Groups D; Class II, Div. 2, Groups E, F, G; Class III and NEMA 7, 9 NEMA 3. (7 lb). Switch must be factory installed. 

**Note:** To order, change 1910 base number to 1911, add -EXPL suffix. **Example:** 1911-1-EXPL 

## **Manual Reset Option (Model 1900 MR)** 

Includes special snap switch which latches on pressure increase above the setpoint. Switch must be manually reset after pressure drops below the setpoint. Available on -1, -5,-10 or -20 ranges only. Option is not UL, CSA or FM listed. For use only in single positive pressure applications. 

**Note:** To order, change 1910 base number to 1900, add -MR suffix. **Example:** 1900-10-MR 

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## USA: California Proposition 65 

**WARNING:** This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. 

**Process Tubing Options: See page 453 (Gage Tubing Accessories)** 

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