1950-1-2F

## **SERIES 1950** ~~Duyer~~ 

## ~~C € @~~ 

EXPLOSION-PROOF DIFFERENTIAL PRESSURE SWITCH Compact, Low Cost, Explosion-proof and Weatherproof 1/8 FEMALE NPT 

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1/8 FEMALE NPT 1-15/32 [37.30] NOTE: 1950-02: 7-3/4˝ [196.9] DIA.<br>EXTERNAL LOW PRESSURE CONNECTION 3/8 [9.53] X 4-11/32˝ [110.3] DEPTH. FOR<br>GROUND et CAPTIVE SCREW — fie s 27/32 [21.43] DRAWING 28-700175-00 FROM COMPLETE DIMENSIONS REQUEST<br>[2] Ø17/64 [6.75] MOUNTING OUR CUSTOMER SERVICE<br>HOLES EQUALLY SPACED ON 27/32 DEPARTMENT<br>A 4-7/8 [123.83] B.C. VENT DRAIN [21.43]<br>PA CH i PLUG I oe 1/8 FEMALE NPT HIGH<br>RANGE ADJUSTMENT SCREW PRESSURE CONNECTION<br>5-7/16 3/8 [9.53]<br>[138.13] 1-23/32 [43.64]3-1/2 [88.90] 1/2 FEMALE NPTELECTRICAL CONNECTION<br>**----- End of picture text -----**<br>


**Series 1950 Explosion-Proof Differential Pressure Switch** combines the best features of the popular Dwyer[®] Series 1900 Pressure Switch with an integral explosionproof and weatherproof housing, making it an exceptional value for either application. It is CE, UL and CSA listed, FM approved for use in Class I, Div 1, Groups C and D, Class II Groups E, F, and G and Class III hazardous atmospheres NEMA 7 and 9. Rain tight NEMA 3 (IP54), weatherproof features include a drain plug and O-ring seal in cover. Electrical connections are easily made by removing front cover. For convenience the set point adjustment screw is located on the outside of the housing. Twelve models offer set points from .03 to 20 in w.c. (0.0075 to 5 kPa) and from .5 to 60 psi (0.035 to 3.5 bar). The unit is very light and compact - about half the weight and bulk of other explosion-proof or weatherproof switches with separate enclosures. **CAUTION:** For use only with air or compatible gases. Applications with hazardous atmospheres and a single positive pressure may require special venting. 

## **SPECIFICATIONS** 

**Electrical Rating:** 15 A @, 125, 250, 480 VAC, 60 Hz. Resistive  1/8 HP @ 125 VAC, 1/4 HP @ 250 VAC, 60 Hz. **Electrical Connections:** 3 screw type, common, normally open and normally closed. 

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

**Wetted Materials:** Consult factory. **Temperature Limits:** -40 to 140°F (-40 to 60°C); 0 to 140°F (-17.8 to 60°C) for 1950P-8, 15, 25, and 50. -30 to 130°F (-34.4 to 54.4°C) for 1950-02. 

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

**Pressure Limits:** Continuous: 1950’s - 45 in w.c. (0.11 bar); 1950P’s - 35 psi (2.41 bar); 1950P-50 only - 70 psi (4.83 bar). Surge: 1950’s - 10 psi (0.69 bar), 1950P’s - 50 psi (3.45 bar), 1950P-50 only - 90 psi (6.21 bar). 

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

1950P’s - 50 psi (3.45 bar), 1950P-50 **Set Point Adjustment:** Screw type on only - 90 psi (6.21 bar). top of housing. **Enclosure Rating:** NEMA 3 (IP54), **Weight:** 3.25 Ib (1.5 kg); 1950-02 model, NEMA 7 and 9. 4.4 lb (2 kg). **Switch Type:** Single-pole double-throw **Compliance:** CE, CSA, FM, UL. (SPDT). 

## **BENEFITS/FEATURES** 

- Explosion-proof and weatherproof housing provides device protection for outdoor use or harsh environment operation 

- External set point screw provides easy access that simplifies making adjustments without opening or disassembling enclosure 

- Easily accessible electrical connection simplifies the installation 

## **APPLICATIONS** 

- HVAC applications • Process applications • All-weather applications 

## **MODEL CHART** 

|**MODEL CHART**|**MODEL CHART**|**MODEL CHART**|**MODEL CHART**|**MODEL CHART**|**MODEL CHART**|**MODEL CHART**|**MODEL CHART**|**MODEL CHART**|**MODEL CHART**|**MODEL CHART**|**MODEL CHART**|
|---|---|---|---|---|---|---|---|---|---|---|---|
|**Model**|**Range,**<br>**psid**|**Approximate**<br>**Deadband**||**Model***|**Range***|**Approximate**<br>**Deadband**||**Model**|**Range,**<br>**in w.c.**|**Approximate**<br>**Deadband**||
|||**Min.**<br>**Set Point**|**Max.**<br>**Set Point**|||**Min.**<br>**Set Point**|**Max.**<br>**Set Point**|||**Min.**<br>**Set Point**|**Max.**<br>**Set Point**|
|**1950P-2-2F**<br>**1950P-8-2F**<br>**1950P-15-2F**<br>**1950P-25-2F**|0.5 to 2<br>1.5 to 8<br>3  to 15<br>4  to 25|0.3<br>1.0<br>0.9<br>0.7|0.3<br>1.0<br>0.9<br>0.7|**1950P-50-2F**<br>**1950-00-2F**<br>**1950-0-2F**|**Range**<br>15 to 50<br>.07 to .15<br>.15 to .50|1.0<br>.04<br>.10|1.5<br>.05<br>.15|**1950-1-2F**<br>**1950-5-2F**<br>**1950-10-2F**<br>**1950-20-2F**|**1950-1-2F**<br>.4 to 1.6<br>1.4 to 5.5<br>3 to 11<br>4 to 20|.15<br>.30<br>.40<br>.40|.20<br>.40<br>.50<br>.60|
|*P=PSID range models. Other ranges in w.c.||||||||||||
|PSID range models. Other ranges in w.c.<br>**Caution:**For use only with air or compatible gases. Applications with hazardous atmospheres and  a single positive pressure may require special venting.||||||||||||