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 500°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 500°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 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 30°F to 500°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.
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