To order
specify Model
Number*
1950G-00-B-__
1950G-0-B-__
1950G-1-B-__
1950G-5-B-__
1950G-10-B-__
1950G-20-B-__
Operating
Range
Inches, W.C.
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
At Min.
Set Point
0.04
0.06
0.11
0.4
0.9
1.2
Approximate
Dead Band
At Max.
Set Point
0.06
0.11
0.29
0.9
1.8
3.0
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. Box 373 • Michigan City, IN 46360-0373, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com
The Model 1950G Explosion-Proof Switch combines the best features
of the popular Series 1900 Pressure Switch with a compact explosion-
proof housing.
This unit is UL, CSA, FM listed for use in Class I, Groups A*, B, C, D,
Class II, Groups E, F, & G and Class III atmospheres and Directive
94/9/EC (ATEX) Compliant for II 2G Ex d IIB + H
2
T6 Gb. IECEx
certified Ex d IIB + H
2
T6 Gb (-40°C < Ta < + 60°C) units are available.
It is also totally rain-tight for outdoor installations. Six models allow set-
points from 0.07 to 20 inches W.C. ( 1.78 mm to 508.0 mm W.C.).
Easy access to the SPDT relay for electrical hook-up is provided by
removing the top plate of the aluminum housing. A captive screw allows
the cover to swing aside while remaining attached to the unit.
Adjustment to the set point of the switch can be made without
disassembly of the housing. The unit is very compact, about half the
weight and bulk of equivalent conventional explosion-proof switches.
SPECIFICATIONS
Service: Air and compatible combustible gases.
Wetted Materials: Contact Factory.
Temperature Limits: 0 to 140°F (-17 to 60°C). Note: Set point drift may
occur with ambient temperature changes.
Pressure Limits: 45˝ w.c. (11.2 kPa) continuous; 10 psig (68.95 kPa)
surge.
Enclosure Rating: IP54, NEMA 3, 7 and 9.
Switch Type: 1 Form C relay (SPDT).
Electrical Rating: 10A, 120/240 VAC, 28 VDC. Resistive 50mA, 125
VDC.
Power Requirements: 24 VDC ±10%. 120 or 240 VAC ±10% optional.
Electrical Connections: Internal Terminal Block.
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: 2 lb, 15.7 oz (1.35 kg).
Series 1950G – Integral Explosion-Proof Pressure Switches
Specifications - Installation and Operating Instructions
Bulletin E-57G
UL, CSA, FM Listed For
CL, I GR. A*, B, C, D - CL. II GR. E, F, G - CL. III
Directive 94/9/EC (ATEX) Compliant For
0344 II 2G Ex d IIB + H
2
T6 Gb
EC-Type Certificate Number: KEMA 03ATEX2402 X
ATEX Standards:
EN60079-0: 2009
EN60079-1: 2007
IECEx Certified for:
Ex d IIB + H
2
T6 Gb (-40°C < Ta < +60°C)
IECEx Certificate of Conformity:
IECEx DEK 11.0092X
IECEx Standards:
IEC 60079-0: 2007
IEC 60079-1: 2007
Model 1950G Switches:
Operating ranges and deadbands
Set Point
Adjustment
Screw
1/2˝ female
NPT
Electrical
Conduit
Connection
Vent Drain
Plug
Captive
Screw
*GR. A is Only.
External
Ground Screw
* Specify either 24 for 24 VDC, 120 for 120 VAC or 240
for 240 VAC when ordering. Example: 1950G-00-B-120
* Add “NA” suffix for models with UL, CSA, and FM approvals
only. Example: 1950G-00-B-120-NA
Attention: Units with the “NA” suffix are not Directive 94/9/EC (ATEX)
compliant. These units are not intended for use in potentially explosive
atmospheres in the EU. These units may be CE marked for other
Directives of the EU.
(8 pages)
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