A
t Min. Set Point
0
.025
0.04
0.10
0.15
0
.3
0
.4
0
.4
Min. Set Point
0.3 psi
1.0 psi
0
.9 psi
0
.7 psi
1
.0 psi
Series 1950 Explosion-Proof Differential Pressure Switches com-
bine the best features of the Series 1900 Pressure Switch with an inte-
gral explosion-proof and weather-proof housing. Each unit is UL &
CSA listed; FM approved for use in Class I, Groups C & D; Class II,
Groups E, F, & G; and Class III atmospheres (NEMA 7 & 9). They are
totally rain-tight for outdoor installations. Twelve models allow set-
points from .03 to 20 inches w.c. and from .5 to 50 psi (3.4 to 345 kPa).
Easy access to the SPDT switch for electrical hook-up is provided by
removing the top plate of the three-part aluminum housing. Adjustment
to the set point of the switch can be made without disassembling the
housing. The unit is very compact, about half the weight and bulk of
equivalent conventional explosion-proof switches.
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: IP54, NEMA 3, 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 Ib (1.5 kg); 1950-02 model, 4.4 lb (2 kg).
Agency Approvals: CE, UL, CSA, FM.
RESPONSE TIME: Because of restrictive effect of flame arrestors,
switch response time may be as much as 10-25 seconds where applied
pressures are near set point.
Series 1950 Explosion-Proof Differential Pressure Switches
Specifications - Installation and Operating Instructions
Bulletin E-57
UL and CSA Listed, FM Approved For
C
L. I GR. C, D - CL. II GR. E, F, G - CL. III
Series 1950 Switches
Operating ranges and deadbands
T
o order
s
pecify
M
odel Number
1
950-02-2S
1950-00-2F
1950-0-2F
1950-1-2F
1
950-5-2F
1
950-10-2F
1
950-20-2F
Model Number
1950P-2-2F
1950P-8-2F
1950P-15-2F
1950P-25-2F
1950P-50-2F
Operating
Range:
I
nches, W.C.
0
.03 to 0.10
0
.07 to 0.15
0.15 to 0.5
0.4 to 1.6
1.4 to 5.5
3.0 to 11.0
4
.0 to 20.0
O
perating
R
ange: PSI
0.5 to 2.0
1.5 to 8.0
3.0 to 15.0
4.0 to 25.0
1
5.0 to 50
A
pproximate
D
ead Band
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P
.O.
BOX 373
•
MICHIGAN
CITY
,
INDIANA
46361, U.S.A.
Fax:
219/872-9057
e-mail:
[email protected]CAUTION
For use only with air or compatible gases. Use of the Model 1950
switch with explosive media connected to the Low pressure port
(including differential pressure applications in such media) is not rec-
ommended. Switch contact arcing can cause an explosion inside the
switch housing which, while contained, may render the switch inoper-
ative. If switch is being used to sense a single positive pressure rela-
tive to atmosphere, run a line from the low pressure port to a non-haz-
ardous area free of combustible gases. This may increase response
time on -0 and -00 models.
Note: The last number-letter combination in the model number identi-
fies the switch’s electrical rating (number) and diaphragm material (let-
ter). The 2F combination is standard as described in the physical data
above. In case of special models, a number 1 rating is the same as 2;
a number 3 or 4 rating is 10A 125, 250, 480 VAC; 1/8 H.P. 125 VAC; 1/4
H.P. 250 VAC; a number 5 or 6 rating is 1A 125 VAC. Letter B indicates
a Buna-N diaphragm; N = Neoprene; S = Silicone; and V = Viton
®
.
At Max. Set Point
0
.05
0
.05
0
.15
0.20
0.4
0.5
0.6
M
ax. Set Point
0
.3 psi
1.0 psi
0
.9 psi
0
.7 psi
1
.5 psi
A
pproximate Dead Band
S
et Point Adjustment
S
crew
1
/2˝ (12.7)
female NPT
Electrical
Conduit
C
onnection
(20 pages)
(8 pages)
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