Dwyer Instruments SERIES 1950G Data Sheet
®
SERIES 1950G | EXPLOSION-PROOF DIFFERENTIAL PRESSURE SWITCH
FEATURES/BENEFITS
• ATEX Approved Explosion Proof for natural gas applications
• External set point screw provides easy access without opening or
disassembling enclosure
•Easilyaccessibleelectricalconnectionsimpliestheinstallation
• Isolated process chambers from electrical compartment
APPLICATIONS
• Natural gas applications
• Process applications
• All-weather applications
DESCRIPTION
The SERIES 1950G Explosion-proof Differential Pressure Switch combines the best
features of the popular Dwyer® Series 1900 Pressure Switch with the benet of natural gas
compatibility. Units are rain-tight for outdoor installations, and are UL listed for use in Class I,
Groups A, B, C, & D; Class II, Groups E, F, & G and Class III atmospheres, Directive 2014/34/
EU (ATEX) Compliant for CE ATEX II 2G Exd IIB+H2 T6, CSA & FM approved for Class I,
Div. 1, Groups B, C, D; Class II, Div. 1, Groups E, F, G and Class III atmospheres IECEx Ex
d IIB+H2 T6 (-40°C < Ta < +60°C). The 1950G is very compact, about half the weight and
bulk of equivalent conventional explosion-proof switches. Easy access to the SPDT relay
and power supply terminals is provided by removing the top plate of the aluminum housing.
A supply voltage of 24 VDC, 120 or 240 VAC is required. 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.
SPECIFICATIONS
Service Air and compatible combustible gases.
Wetted Materials Consult factory.
Temperature Limits 0 to 140°F (-17 to 60°C). Note: Set point drift may occur with ambient temperature changes.
Pressure Limits (Continuous) 45˝ w.c. (11.2 kPa) continuous; 10 psig (68.95 kPa) surge.
Enclosure Rating NEMA 3 (IP54), NEMA 7 & 9.
Switch Type 1 Form C relay (SPDT).
Electrical Rating 10 A, 120/240 VAC, 28 VDC. Resistive 50 mA, 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 lbs 15.7 oz (1.35 kg).
Agency Approvals ATEX, CE, CSA, FM, IECEx, UL.
DWYER INSTRUMENTS, INC.
®
DIMENSIONS WIRING DIAGRAM
[42.86]
CONNECTION
17/64˝ DIA. MTG. HOLES (2)
CAPTIVE
]
RANGE
ADJUSTMENT
SCREW
1/2˝ NPT
ELECTRICAL
CONDUIT
EXTERNAL GROUND
4-7/8
[123.8]
5-7/16
[138.1]
3-1/2
[88.90]
SCREW
1/8˝ NPT HIGH
PRESSURE PORT
1-11/16
1/8˝ NPT
LOW PRESSURE
PORT
VENT
DRAIN
PLUG
1-17/32
[38.89]
13/32
[10.312
HOW TO ORDER
Use the bold characters from the chart below to construct a product code.
1950G
SERIES
1950G
RANGE
-00 - 0.07 - 0.15˝ w.c.
-0 - 0.15 - 0.5˝ w.c.
-1 - 0.4 - 1.6˝ w.c.
-5 - 1.5 - 5.5˝ w.c.
-10 - 3.0 - 11.0˝ w.c.
-20 - 4.0 - 20.0˝ w.c.
DIAPHRAGM
-B - Buna-N
-X
-B
-X -X
OPTIONS
-AT - Aluminum Tag
-NA - Non-Atex Approved Units
-PRESET - Preset
-ST - Stainless Steel Tag
INPUT VOLTAGE SUPPLY
-120 - 120 VAC (standard)
-240 - 240 VAC
-24 - 24 VDC
Important Notice: Dwyer Instruments, Inc. reserves the right to make changes to or discontinue any product or service identied in this publication without notice. Dwyer advises its customers to obtain the
latest version of the relevant information to verify, before placing any orders, that the information being relied upon is current.
DWYER INSTRUMENTS, INC.
DS-1950G | 3/17
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