Dwyer Instruments 1950 Data sheet
Series
EXTERNAL
GROUND
(2) Ø17/64 [6.75]
MOUNTING HOLES
EQUALLY SPACED
ON A 4-7/8 [123.83] B.C.
RANGE
ADJUSTMENT
SCREW
5-7/16
[138.13]
1/2 FEMALE
NPT
ELECTRICAL
CONNECTION
VENT DRAIN
PLUG
CAPTIVE
SCREW
1/8 FEMALE NPT
LOW PRESSURE
CONNECTION
1-15/32
[37.30]
3/8
[9.53]
27/32
[21.43]
27/32
[21.43]
3-1/2
[88.90]
1-23/32
[43.64]
3/8
[9.53]
1/8 FEMALE NPT
HIGH PRESSURE
CONNECTION
1950
Explosion-proof Differential Pressure Switches
PRESSURE
Model 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
Differential Pressure Switches
include a drain plug and O-r ing seal in cover. Electr ical 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. (7.5 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.
Series 1950 Switches - Operating Ranges and Dead Bands
Model
1950-02-2S
1950-00-2F
1950-0-2F
1950-1-2F
1950-5-2F
1950-10-2F
1950-20-2F
Range,
in w.c.
.03 to .10
.07 to .15
.15 to .50
.4 to 1.6
1.4 to 5.5
3 to 11
4 to 20
Compact, Low Cost, Explosion-proof and Weatherproof
Approximate Dead Band at
Min. Set Point
.025
.04
.10
.15
.30
.40
.40
Max. Set Point
.05
.05
.15
.20
.40
.50
.60
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 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).
Enclosure Rating: NEMA 3 (IP54), NEMA 7 & 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
®
Model*
1950P-2-2F
1950P-8-2F
1950P-15-2F
1950P-25-2F
1950P-50-2F
CAUTION: For use only with air or compatible gases.
Applications with hazardous atmospheres and a single positive
pressure may require special venting. *P=PSID range models
Range,
psid
0.5 to 2
1.5 to 8
3 to 15
4 to 25
15 to 50
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 Ib (1.5 kg); 1950-02 model, 4.4 lb
(2 kg).
Agency Approvals: CE, CSA, FM, UL.
Approximate Dead Band at
Min. Set Point
.3
1.0
.9
.7
1.0
Max. Set Point
.3
1.0
.9
.7
1.5
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