C437E1038 Pressure or differential - pressure limit controls for industrial gas systems. SPST mercury switch. Opens circuit on pressure fall. Manual reset. 1/2 to 5-1/2 inches water. Max sustained operating pressure 3.0 PSI (20.7 kPa)
|Product Name:||Honeywell Gas Pressure Limit Switch|
|Description:||Pressure or differential - pressure limit controls for industrial gas systems. SPST mercury switch. Opens circuit on pressure fall. Manual reset. 1/2 to 5-1/2 inches water.|
Use C437 for spst switching or C637 for spdt switching. Compensate for momentary surges in gas pressure with a restrictive orifice in inlet pressure channel on the models with pressure range of 1 to 26 in. wc (0.25 to 6.5 kPa). Resume operation by manually resetting when using lockout application models. Impede tampering and provide dust-resistant operation with enclosed setting. Increase strength of control diaphragm with Buna-N fiber-reinforced material. Clear glass cover allows observation of interior mechanism to aid in setting and checkout. Mercury switch provides visual indication of switch position.
Underwriters Laboratories Inc. Listed: File No. MP2168, Guide No. MFHX.
Canadian Standards Association Certified: File No. LR1620, Guide No. 380-W-1.16.
Factory Mutual Approved: Report Nos.22018,24127, J.I.IF4A3.AF.
Industrial Risk Insurers Acceptable.
32 F to 125 F (0 C to 52 C).
1/2 in. NPT female for main or high pressure.
1/8 in. NPT female for vent or low pressure.
106729 Cover Glass, 6 in. (152.5 mm) diameter.
106747 Cover Retaining Ring for C437 and C637 models manufactured before 1973.
118733-00021 Retaining Clip for C437 and C637 models manufactured since 1975.
139870A Cover Glass for rainproof enclosures.
122160 Orifice - 0.018 in. (0.46 mm) diameter.
124674 Orifice - 0.011 in. (0.28 mm) diameter.
4074BWK Mounting Brackets, for surface mounting.
Differential at midscale. Subtractive for C437D, J, G. Additive for C437E, F, H, K and C637B.
|Units Per Package:||1|
|-Applications:||Safety Shutoff, Pressure and differential - pressure limit controls for industrial gas systems.|
|Pressure Range:||1/2 to 5-1/2 in. water (0.1 to 1.4 kPa)|
|Differential:||0.25 in. (0.06 kPa)|
|Pressure Surge, Maximum:||3.0 psi, (20.7 kPa)|
|Max. Sustained Operating Pressure||3.0 PSI (20.7 kPa)|
|Switch, Mercury:||Spst, break on fall|
|Switch Action (Breaks):||Fall|
|Reset, Manual (Lockout On Switch Break):||Yes, Manual reset|
|Switch Contact Rating (120 Vac)||8.0 AFL, 48.0 ALR, 10.0 resistive|
|Switch Contact Rating (120 Vdc)||2.4 AFL, 24.0 ALR, 5.0 resistive|
|Switch Contact Rating (240 Vac)||5.1 AFL, 30.6 ALR, 5.0 resistive|
|Switch Contact Rating (240 Vdc)||1.2 AFL, 12.0 ALR, 2.0 resistive|
|Minimum Order Quantity:||1|
|Trade Name Type:||Registered Trademark|
Please visit Industrial Process and Sensor for more info.
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