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Series 1900 Compact Low Differential Pressure Switches

Series 1900 Compact Low Differential Pressure Switches

Series 1630 Large Diaphragm Pressure Switches

Series 1630 Large Diaphragm Pressure Switches

Series 1950 Explosion-proof Differential Pressure Switch

Compact, Low Cost, Explosion-proof and Weatherproof

Series 1950 Explosion-Proof Differential Pressure Switch combines the best features of the popular Dwyer® Series 1900 Pressure Switch with an integral explosion-proof 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 & 9), Raintight 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 50 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 weather-proof 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.

Product Applications

  • HVAC applications
  • Process applications
  • All-weather applications
Starting at $311.00
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Grouped product items
Model Description Availability* Qty Price
1950-1-2F Differential pressure switch, range .4-1.6" w.c., approx. deadband @ min. set point 0.15, approx. deadband @ max. set point 0.20. Call for Details*
$311.00
1950-10-2F Differential pressure switch, range 3-11" w.c., approx. deadband @ min. set point 0.40, approx. deadband @ max. set point 0.50. Call for Details*
$311.00
1950-20-2F Differential pressure switch, range 4-20" w.c., approx. deadband @ min. set point 0.40, approx. deadband @ max. set point 0.60. Call for Details*
$311.00
1950-5-2F Differential pressure switch, range 1.4-5.5" w.c., approx. deadband @ min. set point 0.30, approx. deadband @ max. set point 0.40. Call for Details*
$311.00
1950P-15-2F Differential pressure switch, range 3-15 psid, approx. deadband @ min. set point 0.9, approx. deadband @ max. set point 0.9. Call for Details*
$357.00
1950P-2-2F Differential pressure switch, range 0.5-2 psid, approx. deadband @ min. set point 0.3, approx. deadband @ max. set point 0.3. Call for Details*
$357.00
1950P-25-2F Differential pressure switch, range 4-25 psid, approx. deadband @ min. set point 0.7, approx. deadband @ max. set point 0.7. Call for Details*
$357.00
1950-0-2F Differential pressure switch, range .15-.50" w.c., approx. deadband @ min. set point 0.10, approx. deadband @ max. set point 0.15. Call for Details*
$311.00
1950P-50-2F Differential pressure switch, range 15-50 psid, approx. deadband @ min. set point 1.0, approx. deadband @ max. set point 1.5. Call for Details*
$357.00
1950P-8-2F Differential pressure switch, range 1.5-8 psid, approx. deadband @ min. set point 1.0, approx. deadband @ max. set point 1.0. Call for Details*
$357.00

Specifications

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.
Pressure Limits:
Continuous: 1950's - 45" 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).
Enclosure Rating:
NEMA 3 (IP54), NEMA 7 and 9.
Switch Type:
Single-pole double-throw (SPDT).
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.
Process Connections:
1/8" female NPT.
Mounting Orientation:
Diaphragm in vertical position. Consult factory for other position orientations.
Set Point Adjustment:
Screw type on top of housing.
Weight:
3.25 lb (1.5 kg); 1950-02 model 4.4 lb (2 kg).
Compliance:
CE, CSA, FM, UL.

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

Support Library

Manuals

Catalog Pages

Product Data Sheet

Model Chart

EXAMPLE 1950 02 2 S AT Series 1950-02-2S-AT Explosion-proof Differential Pressure Switch, range 0.03-0.10" w.c., mica silver contact micro switch, silicone diaphragm, with aluminum tag.
SERIES 1950
1950P
        Explosion-proof Differential Pressure Switch (for Inches w.c. Ranges)
Explosion-proof Differential Pressure Switch (for psid Ranges)
RANGE   02
00
0
1
5
10
20
2
8
15
25
50
      0.03-0.10" w.c.
0.07-0.15" w.c.
0.15-0.5" w.c.
0.4-1.6" w.c.
1.4-5.5" w.c.
3.0-11.0" w.c.
4.0-20.0" w.c.
0.5-2.0 psid
1.5-8.0 psid
3.0-15.0 psid
4.0-25.0 psid
15.0-50.0 psid
MICRO SWITCH TYPE     2
6
M
    10G Mica Silver Contact
10G Phenolic Gold Contact
10G Phenolic Silver Contact
DIAPHRAM MATERIAL       B
F
N
S
V
  Buna-N
Fluorosilicone
Neoprene  (1950 only)
Silicone  (1950 only)
Fluoroelastomer  (1950 only)
OPTIONS         AT
PRESET
ST
Aluminum Tag
Preset
Stainless Steel Tag

Questions

Question
I am going to order the d/p switch 1950-5-2-S-AT. Option "-AT" is an aluminum tag. I would like to know the size of the tag.
Answer
Aluminum tags may contain 2 lines, approximately 9 characters per line.
Question
Does Dwyer offer a fully UL/FM/CSA approved explosion proof pressure switch?
Answer
Yes. The 1950 and 1950G Series.
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Model Description Availability* Price