Field Instruments

General

The C437D,E Gas Pressure Switches are pressure-actuated switching devices used in industrial gas system applications for safety shutoff, pressure control, and differential-pressure control. All Series 4 models have MicroSwitch™ snap switches to open or close a circuit on pressure rise or drop.

Features

• C437 models have direct- and reverse-acting (spst) switching.
• Pressure ranges: 1/2 to 5-1/2 in. of water (0.1 to 1.4 kPa); 1 to 26 in. of water (0.5 to 7 kPa); 1/2 to 5 psi (3 to 35 kPa); 1 to 10 psi (5 to 70 kPa).
• Models intended for lockout applications must be manually reset before resuming operation.
• Trip-free mechanism on manual reset models ensures that the limit function of the switch cannot be defeated by jamming the reset lever.
• External manual reset button on side of lockout models.
• Enclosed setting impedes tampering and provides dust-resistant operation. •Buna-N fiber-reinforced material for increased strength of control diaphragm. •Two Buna-N fiber-reinforced seal-off diaphragms for added reliability.
• Clear glass cover allows observation of interior mechanism to aid setting and checkout.
• Heavy die-cast case increases durability and resistance to corrosion.
• Main control diaphragm completely enclosed a leakproof chamber can be vented to a safe area.
• Models with a pressure range of 1 to 26 in. of water (0.5 to 7 kPa) have a restrictive orifice in the inlet pressure channel to compensate for momentary surges in gas pressure.
• Field-addable orifices of various sizes are available..

Specifications

• Make:  Honeywell
• Model: C437D2003/U
• Sensor Element:BUNA N Diaphragm
• Materials (Case): Die-cast aluminum
• Thread Connections: 1/2 in. NPT internal thread
• Maximum Sustained Operating Pressure (psi)   5.0 psi
• Maximum Sustained Operating Pressure: (kPa)  34.5 kPa
• Application: Industrial gas system applications for safety shutoff, pressure control, or differential-pressure control.
• Pressure Differential: (psi)  1 3/4 in. wc
• Pressure Differential: (kPa) 0.44 kPa
• Operating Range: (psi)       1 to 26 in. wc
• Maximum Ambient Temperature (F):125 F
• Operating Range (kPa): 0.5 to 7.0 kPa
• Maximum Ambient Temperature (C): 52 C
• Switch Operation: Manual Reset
• Switching Action: SPST, break on rise, non-mercury

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