Compact and low cost, Model FM-437 employs a bimetal element inside an immersion well. Instrument is detachable from the well, allowing maintenance without draining system. Visible calibrated dial reduces "start up" time and speeds set point changing. Contacts are hermetically sealed and mercury wetted. High current (up to 17A) capacity switches available on special order.

SPECIFICATIONS
Service: Compatible liquids or gases.
Wetted Materials: Well: Copper or 304 SS.
Temperature Limit: Process: 375°F (190°C), Ambient: 180°F (82°C).
Pressure Limit: Copper well: 200 psi (13.8 bar) @ 300°F (149°C), 304 SS well: 900 psi (62 bar) @ 300°F (149°C).
Enclosure Rating: General purpose.
Switch Type: SPDT mercury switch. Optional SPST.
Electrical Rating: 4A @ 120 VAC/DC, 2A @ 240 VAC/DC. 1/8 HP @ 120/240 VAC single phase.
Electrical Connections: Screw terminal.
Conduit Connection: 7/8" (22.23 mm) hole for 1/2" (12.7 mm) conduit hub.
Process Connection: 3/4" NPT male.
Mounting Orientation: Horizontal and level.
Set Point Adjustment: Internal moveable pointers for set point and reset point.
Weight: 2 lb (0.9 kg).
Deadband: Adjustable, see model chart on "Ordering" Page.
Options: SPST mercury switches with higher current ratings.
Set Point Scale: Indication in °F standard. °C optional.
Agency Approvals: UL, FM and CSA.