THE ONLY METAL CARTRIDGE THERMOSTATS THAT WITHSTAND MECHANICAL CLAMPING OR PINCHING OF CARTRIDGE WITHOUT AFFECTING THE SET CALIBRATION

SENSITIVE - RUGGED - CLEAN MAKE AND BREAK

RATING : 1200 WATTS, 115-230 VOLTS AC

SERIES FM THERMOSTATS ARE PATENTED #2,735,912, #2,770,699

WORKING PRINCIPLE

In the FM cartridge thermostat a thermosensitive bimetal element, in optimum thermal contact with the cartridge housing, actuates a pair of switch members to open and close its' contacts in response to temperature change. The bimetal is electrically insulated from the switch blades. Thermal strain relief is incorporated to prevent calibration drift.

FEATURES

• Complete lack of reliance on the expansion of the cartridge shell for the make and break of contacts permits greater mounting flexibility. This assures correct operation when slight pressure might be applied to the cartridge shell during use.
  
• Permits insertion into tighter fitting holes in metal blocks which results in rapid heat response and closer temperature control of the metal block.
  
• Lead wires are mechanically strain relief protected to prevent external movement of wires from being transferred to the contact members in the enclosure.
  
• Maximum temperature operation of the FM cartridge thermostat is 450 °F.
  
• Temperature differential as low as 1°F under ideal test conditions.
  
• Temperature adjustment
  
• Normally closed--turn adjustment screw counter-clockwise to increase temperature above room temperature.
  
• Normally open--turn adjustment screw clockwise to increase temperature above room temperature.
  
• One complete turn of the adjustment screw is 26°F up to 300°F maximum or 80°F up to 450 °F maximum.
  
• Brass cartridge is standard.
  
• The outside diameter of the cartridge is .624" to fit into a 5/8" diameter hole.
  
• MODEL FM-386, an extended version of the FM-132, measures 3-23/32" long.
  
• Rating : 1200W. 115-230 V.A.C. **
  
• FM series thermostats are covered under the UL/CUL Component Recognition Program
  

**Maximum rating applies for temperatures above 175°F.

ORDERING DATA

• The FM series thermostats are made in several adjustable ranges for maximum sensitivity. State approximate working temperature.
  
• Factory calibration is available from 35°F to 450°F.
  
• State contact arrangement.
  
• Normally closed--to open on temperature rise.
  
• Normally open--to close on temperature rise.
  
• Standard lead length of 4 inches. Available with lead lengths up to 48 inches.

MODEL FM-132

Back to the top

MODEL FM-156

Has a 1/2" NPT hex fitting soldered to a basic Model FM-132. The adjustment screw is accessible through the top of the hex. It has a probe length of 2"
RATING : 1200W. 115-230 V.A.C.

Back to the top

MODEL FM-165

Has a 1-3/4" diameter by 1/16" thick mounting flange provided with three 8-32 mounting holes on a 1-1/4" circle soldered to a basic Model FM-132. The probe length is 2-1/16"
RATING : 1200W. 115-230 V.A.C.

Back to the top

MODEL FM-171

Has soldered to a basic Model FM-132 a 1/2" NPT pipe coupling threaded at both ends for installing into tanks or pipe lines. The outer threaded end installs into a standard knockout or explosion-proof box. The adjustment screw is easily accessible through the open end of the coupling. A probe length of 2" is standard. An optional 1" probe is available.
RATING : 1200W. 115-230 V.A.C.

Back to the top

MODEL FM-247

Has a 1/2" NPT hex fitting soldered to a basic MODEL FM-132. The adjustment screw protrudes past the hex fitting. Supplied with a probe length of 1-1/8" or 1".
RATING : 1200W. 115-230 V.A.C.

Back to the top

MODEL FM-344

Was designed for trouble free service in moist environments. It is supplied with a 1/2" NPT hex fitting and probe length of 2-1/4". An extended adjustment shaft is provided for the adjustment knob. Polyvinyl insulated lead wires emerge from a side bushing. All crevices are epoxy sealed to reduce moisture condensation into the thermostat. The standard temperature range is approximately 70°F. (39°C.)with a maximum possible temperature of 212°F. (100°C;.)
RATING : 1200W. 115-230 V.A.C.

Back to the top