Honeywell C437K User Manual
C437D,E,F,G,H,J,K AND C637B GAS PRESSURE SWITCHES
60-2320—9
3
Switch:
Mercury switch (C437F,J and K have two spst switches in one mercury bulb).
Mercury switch (C437F,J and K have two spst switches in one mercury bulb).
Differentials:
Fixed, nominal; measured at pressure indicated:
a
in. = inches of water; mm = millimeters of water.
b
Restrictive orifice in inlet pressure channel to compensate for momentary surges in gas pressure.
c
Not available for C437J.
d
Subtractive models: switching action occurs on pressure rise to the setpoint.
e
Not available for C437K.
f
Additive models: switching action occurs on pressure fall to the setpoint.
Pressure Ranges (Scale Range):
Specify one:
Specify one:
1/2 to 5-1/2 inches of water (10 to 140 mm of water, or
0.1 to 1.4 kPa).
1 to 26 inches of water (50 to 700 mm of water, or 0.5 to
7 kPa).
1/2 to 5 lb per sq in. (300 to 3500 mm of water, or 3 to
35 kPa).
1 to 10 lb per sq in. (500 to 7000 mm of water, or 5 to
70 kPa).
Maximum Sustained Operating Pressure:
Minimum Temperature:
32
32
°
F (0
°
C).
Approvals:
Underwriters Laboratories Inc. Listed: File No. MP2168,
Guide No. MFHX.
Canadian Standards Association Certified: File No. 1620,
Guide No. 380-W-1.16.
Factory Mutual Approved: Report No. 13031-S5 and
19291.
Replacement Parts:
106729 Cover Glass, 6 in. (152.4 mm) diameter.
139870A Cover Glass, for rainproof enclosures.
106747 Cover Retaining Ring, for models manufactured
139870A Cover Glass, for rainproof enclosures.
106747 Cover Retaining Ring, for models manufactured
before 1973.
118733-21 Retaining Clip, for models manufactured since
1975.
Accessories:
4074BWK Bag Assembly: Contains two 137755 Mounting
Brackets and four self-tapping screws: for surface
mounting (standard on C437G and H). Mounting
brackets are shown by dashed lines in Fig. 1.
mounting (standard on C437G and H). 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.
122160: 0.018 in. (0.46 mm) diameter.
Pressure Range
a
Model
1/2 to 5-1/2 in.
(10-140 mm, or
0.1-1.4 kPa)
Differential Measured
at 1/2 in.
1 to 26 in.
b
(50-700 mm, or
0.5-7 kPa)
differential
measured at 15 in.
1/2 to 5 psi
(300-3500 mm, or
3-35 kPa) differential
measurement at
midscale
1 to 10 psi
(500-7000 mm,
or 5-70 kPa)
differential
measurement
Numbers
in.
mm
kPa
in.
mm
kPa
psi
mm
kPa
psi
mm
kPa
Type
a
C437D,J
—
—
—
1-3/4
44.5
0.44
1/2
352
3.45
1
c
703
c
6.89
c
Subtractive
d
C437E,F,H,K
0.25
e
6.4
e
0.06
e
1-1/4
31.8
0.31
1/4
176
1.72
1/2
e
352
e
3.45
e
Additive
f
C637B
0.15
3.8
0.04
C437G
—
—
—
1-1/4
31.8
0.31
1/4
176
1.72
1/2
352
3.45
Subtractive
Maximum Pressure
Pressure Range
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
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.
Vent or Low Pressure: 1/8 in. NPT, female.
Electrical Wiring: Hole tapped for 1/2 in. conduit.
Maximum Ambient Temperature:
125
125
°
F (52
°
C).