C437D,E GAS PRESSURE SWITCHES
3 68-0286
Maximum Sustained Operating Pressure: See Table 4.
Table 4. Maximum Sustained Operating Pressure.
Pipe Connections:
Main or High Pressure: 1/2 in. NPT, female.
Vent or Low Pressure: 1/8 in. NPT, female.
Electrical Wiring: Hole tapped for 1/2 in. conduit.
Maximum Ambient Temperature: 125°F (52°C).
Minimum Temperature: 32°F (0°C).
Approvals:
Underwriters Laboratories Inc. Listed: File No. MP2168, Guide
No. MFHX.
Canadian Standards Association Certified: File No. LR95329,
Certificate No. 1736842.
Factory Mutual Approved: Report No. 3024921.
Replacement Parts:
106729 Cover Glass, 6 in. (152.4 mm) diameter.
118733-21 Retaining Clip.
Accessories:
4074BWK Bag Assembly: Contains two 137755 Mounting
Brackets and four self-tapping screws: for surface
mounting. Mounting brackets are shown by dashed lines in
Fig. 1.
Field-addable Orifices:
124674: 0.011 in. (0.28 mm) diameter.
122160: 0.018 in. (0.46 mm) diameter.
Fig. 1. Installation dimensions of the C437 gas pressure switches, in in. (mm).
RECYCLE NOTICE
If this control is replacing a control that contains
mercury in a sealed tube, do not place your old control
in the trash.
Contact your local waste management authority for instructions
regarding recycling and the proper disposal of an old control
containing mercury in a sealed tube.
Pressure Range
Maximum Pressure
psi kPa
1/2 to 5-1/2 in. of water 3.0 20.7
1 to 26 in. of water 5.0 34.5
1/2 to 5 psi 15.0 103.4
1 to 10 psi 30.0 206.8
2 (50.8)
45
45
7-3/8 (187.3)
1/8–27 NPT
1/2–14 NPT
TAPPED FOR 1/2 IN.
CONDUIT
1
1
2
2
137755 MOUNTING BRACKET (2), IN 4074BWK BAG ASSEMBLY – OPTIONAL.
VENT TAPPING. REMOVE DUST-SEAL LABEL BEFORE MOUNTING.
M7192A
6-1/4 (158.8)
5/16 (7.9) (4)
5/8
(15.9)
(4)
7-11/16
DIA.
(195.3)
7-3/4
(196.9)
6-1/2
(165.1)
1/8
(3.2)
1
(25.4)
1-5/16
(33.3)
3-7/16 (87.3)
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