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Proportional (135 ohm) remote bulb controllers for ducts, tanks, boilers, pipes and other heat exchangers.


  • Provide proportioning control of three-wire, low-voltage valve or damper motors.
  • Used to regulate temperatures of either air or liquids.
  • All models ambient compensated. Ambient temperature compensation provides good temperature control. Refer to T775 Electronic Remote Temperature Controller where more exact control is required and/or remote controller location is preferred.
  • Temperature setting scale markings in both Fahrenheit and Celsius. Steel case has a clear plastic cover to make setting readily visible.
  • Surface mount using two screws through back of case.

Product Specifications

Hazmat Information
UN 1155, ETHYL ETHER, 3, I
Used with Series 90 Modutrol Motors for proportional control of valves and dampers
Dimensions (in.)
5 1/2 in. high x 4 1/2 in. wide x 2 3/4 in. deep
Dimensions (mm)
140 mm high x 114 mm wide x 70 mm deep
Item Type
Setpoint Temperature Range (C)
27 C to 99 C
Setpoint Temperature Range (F)
80 F to 210 F
Operating Temperature Range (F)
230 F Maximum
Operating Temperature Range (C)
110 C Maximum
Analog Output
One 135 Ohm Potentiometer
Sensor Inputs
Sensor Element
Copper bulb, high temperature fill
Capillary Length (ft)
5 ft
Capillary Length (m)
1.5 m
Bulb Size (in.)
1/2 in. diameter x 4 in. long
Bulb Size (mm)
13 mm diameter x 102 mm long
Throttling Range (F)
6 F to 32 F
Throttling Range (C)
3.3 C to 17.8 C
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