GAS PRESSURE SWITCHES
Compact, Low Cost, 4 to 20 in w.c. Range
Model 1996-20 gas-air pressure switch.
Connections, dimensions and visible
on-off indicator are shown.
Reliable and convenient, the SERIES 1996 Gas Pressure Switches serve as a
compact, low cost switch for gas fired furnaces and equipment. Pressure ranges for
both models are ideal for high or low gas pressure interlock. Visible set point and
on-off indicators add convenience in servicing. Use either NO or NC contacts on
SPDT switch. Bottom connection has both 1/8˝ female and 1/4˝ male threads for pipe
nipple or coupling. Top connection vents diaphragm chamber to outside or to furnace
combustion chamber. Mount switch with diaphragm in a horizontal position and gas
pressure connection at bottom. Used with natural, manufactured or LP gas.uv
FEATURES/BENEFITS
• Visible set point and on-off indicator simplifies operation and trouble shooting
• Compact size and low cost make it ideal for gas fired or gas equipment OEM
applications
APPLICATIONS
• Gas furnaces
• Natural, manufactured or LP gas applications
MODEL CHART
Model Range (in w.c.) Model Range (in w.c.)
1996-5 1.4 to 5.5
1996-20 4 to 20
REMOVABLE CONDUIT ENCLOSURE COVER
Ø7/8 [22.23] OPENING FOR 1/2 CONDUIT CONNECTION
WINDOW AND VISIBLE ON-OFF INDICATOR
VENT CONNECTION ON OPPOSITE SIDE
3-1/8
[79.38]
PRESSURE
®
1/4 NPT EXTERNAL THREAD [ALTERNATE GAS CONNECTION]
1/8 [F] GAS PRESSURE CONNECTION
3-1/2
[88.90]
SPECIFICATIONS
Service: Air, natural & manufactured
gas, LP gas.
Wetted Materials: Consult factory.
Temperature Limits: 32 to 110°F (0 to
43.3°C). -30 to 110°F (-34.4 to 43.3°C)
for dry gas or dry air.
Pressure Limits: 45 in w.c. (11.2 kPa)
continuous; 10 psig (68.95 kPa) surge.
Switch Type: SPDT.
Electrical Rating: 15A @ 120-480 VAC,
60 Hz. Resistive 1/8 H.P. @ 125 VAC,
1/4 H.P. @ 250 VAC 60 Hz.
Electrical Connections: 3 screw type,
common, normally open, normally
closed.
Process Connections: 1/8˝ female NPT
or 1/4˝ male NPT.
Vent Connection: 1/8˝ female NPT.
Mounting Orientation: Diaphragm in
horizontal position. Consult factory for
other position orientations.
Set Point Adjustment: Screw type
with visible indicator, inside conduit
enclosure.
Weight: 1 lb 2.3 oz (349 g).
Agency Approvals: CE, CSA, FM, UL.
Process Tubing Options: See page 443 (Gage Tubing Accessories)
uExplosion-Proof Alternative: See page 29 (Series 1950)
vExplosion-Proof Alternative: See page 29 (Series 1950G)
GAS PRESSURE/DIFFERENTIAL PRESSURE SWITCHES
External Adjustment, Visible Dial, Hermetically Sealed Snap or Mercury Switch
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Large sensitive diaphragm and reliable, time proven mechanical design are combined
in SERIES PG pressure/differential pressure switches. For use with air and other
compatible gases, they feature excellent ±1% of full scale repeatability, clear easy-toread scale and convenient external set point adjustment.
Application flexibility is assured by a large variety of switching options including
SPST, SPDT, DPST and DPDT; opening or closing on increasing pressure, vacuum
or differential. PR and PRL models add manual reset operation on increasing
or decreasing pressure. Mercury switches or hermetically sealed snap switches
are available where high humidity would be a problem. If vibration or other factors
preclude the use of mercury, snap switches can be provided. Standard housing is
NEMA 1. Optional enclosures can be supplied for weather resistant and explosionproof requirements.
FEATURES/BENEFITS
• Clear easy-to-read scale and external set point adjustment simplifies operation and
trouble shooting
• Large diaphragm provides accuracy for precise control
• Multiple switching options meet the design of applications
APPLICATIONS
• Natural, manufactured or LP gas applications
45°
Ø7/8 [22.23]
CONDUIT
CONNECTION
Ø6-1/64
[152.78]
[3] Ø13/64 [5.16]
MOUNTING HOLES
Ø7
[177.80]
EQUALLY SPACED ON
6-1/2 [165.10] B.C. 8-1/4
1/8 FEMALE
[209.55]
30° NPT PRESS. CONN.
1/2 MALE NPT X
1/8 FEMALE NPT
PROCESS CONN.
3/4 [19.05] CLEARANCE
FOR COVER REMOVAL
SPECIFICATIONS
Wetted Materials: Fairprene, brass,
steel, and aluminum.
Temperature Limits: -10 to 180°F (-23
to 82°C).
Pressure Limit: Single pressure use on
high side: Sustained pressure: 15 psig
(1.0 bar); Surge limit: 20 psig (1.4 bar).
Differential pressure use: Sustained
pressure, range P1: 2 psig (.14 bar);
Sustained pressure, range P2: 10 psig
(0.7 bar).
Enclosure Rating: General purpose.
Weatherproof and explosion-proof
optional.
Repeatability: ±1% of full range.
Switch Type: SPST mercury switch,
SPDT mercury switch, SPDT snap
switch, or SPDT hermetically sealed
snap switch. Optional DPDT.
Electrical Rating: SPDT mercury: 4A
@ 120 VAC/VDC, 2A @ 240 VAC/VDC.
SPST mercury: 6A @ 120 VAC/VDC, 3A
MODEL CHART
Model
Range
Max. Deadband Switch Type
Model
Range
PG-153-P1 1-30 in w.c.
1.9 in w.c.
SPDT mercury PG-7000-153-P1
1-30 in w.c.
(.25-7.47 kPa) (0.47 kPa)
(.25-7.45 kPa)
PG-153-P2 0.5-5 psid
0.4 psid
SPDT mercury PG-7000-153-P2
0.5-5 psid
(0.3-.345 bar) (0.38 bar)
(.03-.345 bar)
PG-3-P1
1-30 in w.c.
1.3 in w.c.
SPST mercury* PG-7000-153HS-P1 1-30 in w.c.
(.25-7.47 kPa) (0.32 kPa)
(.25-7.47 kPa)
PG-3-P2
0.5-5 psid
0.3 psid
SPST mercury* PG-7000-153HG-P1 1-30 in w.c.
(.03-.345 bar) (0.21 kPa)
(.25-7.47 kPa)
*SPST switches shown are close on increase of pressure.
For open on increase of pressure replace 3 in middle of model number with 2. Example: PG-2-P1.
Max. Deadband
4 in w.c.
(1.0 kPa)
.5 psid
(.035 bar)
4 in w.c.
(1.0 kPa)
4 in w.c.
(1.0 kPa)
1/4
[6.35]
4 [101.6]
1-27/64 [36.12]
17/32 [13.49]
1-3/16 [30.16]
@ 240 VAC/VDC. SPDT Snap: 15A @
120 VAC, 8A @ 240 VAC, 0.5A @ 120
VDC, 0.25A @ 240 VDC. SPDT H.S.
Silver Snap: 5A @ 125/250 VAC, 30
VDC resistive. SPDT H.S. Gold Snap:
1A @ 125 VAC, 30 VDC resistive.
Electrical Connections: Screw type.
Conduit Connection: 7/8˝ (22.23 mm)
hole for 1/2˝ (12.7 mm) conduit hub.
Process Connection: 1/2˝ male NPT
and 1/8˝ female NPT used for single
positive pressure or high differential
pressure, 1/8˝ female NPT used for
single vacuum or low differential
pressure.
Mounting Orientation: Vertical.
Set Point Adjustment: External screw.
Weight: 4.5 lb (2 kg).
Deadband: See model chart.
Agency Approvals: FM, UL for mercury
switch models. UL only on snap switch
models.
Differential Pressure Switches
MERCOID
CONTROL
ADJUSTMENT
SCREW
Switch Type
SPDT snap
SPDT snap
SPDT hermetically
sealed silver snap
SPDT hermetically
sealed gold snap
CONTACT US | U.S. 219/879-8000 | U.K. (+44) (0)1494-461707 | A.U. (+61) (0) 2 4272 2055 | China +852-23181007
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