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Honeywell C437 Auto Recycle Gas/Air Pressure Switches

Auto Recycle Gas/Air Pressure Switches
C437

Pressure or differential pressure limit controls for industrial gas systems.

• Use C437 for SPST 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.

Select a link under the "item" tab below to order.

Cat #Operating Pressure Range (psi)Pressure Differential (psi)Switching ActionMaximum Sustained Operating Pressure (psi)
C437D20031 to 26 in. wc1 3/4 in. wcSPST, break on rise, non-mercury5.0 psi
C437D20111/2 to 5 psi1/2 psiSPST, break on rise, non-mercury15.0 psi
C437D20291 to 10 psi1 psiSPST, break on rise, non-mercury30.0 psi
C437E20021 to 26 in. wc1 3/4 in. wcSPST, break on rise, non-mercury5.0 psi
C437E20101/2 to 5 psi1/2 psiSPST, break on rise, non-mercury15.0 psi
C437E20281 to 10 psi1 psiSPST, break on rise, non-mercury30.0 psi
C437E20360.5 to 5.5 in. wc0.25 in. wcSPST, break on rise, non-mercury3.0 psi
Application Industrial gas system applications for safety shutoff, pressure control, or differential-pressure control.
Dimensions, Approximate see diagram on page 887
Pipe Connections, Main or High Pressure 1/2 in. NPT internal thread
Pipe Connections, Vent or Low pressure 1/8 in. NPT internal thread
Electrical Connections Screw terminals
Sensor Element BUNA N Diaphragm
Differential Type Additive
Switch Operation Auto recycle
Switch Contact Ratings (120 Vac) 8.0 AFL, 48.0 ALR, 10.0 A resistive
(120 Vdc) 2.0 AFL, 20.0 ALR, 8.0 A resistive
(240 Vac) 5.1 AFL, 30.6 ALR, 5.0 A resistive
(240 Vdc) 1.0 AFL, 10.0 ALR, 4.0 A resistive
Temperature Range 32 F to 125 F (0 C to 52 C)
Maximum Ambient Temperature 125 F (52 C)
Materials (Case) Die-cast aluminum
Approvals
Canadian Standards Association File No. LR1620, Guide No. 380-W-1.16
Factory Mutual Approved: Report No. 22018, 24127, J.I.IF4A3.AF
Underwriters Laboratories Inc. Listed File No. MP2168, Guide No. MFHX


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