Types of Temperature Controllers for Silicone Heaters

thermalWe have a variety of options for temperature controllers for silicone heaters. Each type of temperature controller is typically installed right into the silicone heater:

  1. Thermostats
  2. RTDs
  3. Thermistors
  4. Thermocouples

Virtually any type of temperature controller can be incorporated onto the heaters.

These can be designed to work with any of the types of temperature controllers we provide or to work a system of your choosing.

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Thermostats

Thermostats

Snap action and creep action are two different types of thermostats for silicone heaters. Both types have a bimetal expansion-contraction principle and are calibrated at the manufacturer to pre-set to a specific temperature (non-adjustable). If the silicone heater application requires precise temperature control, a digital temperature thermostat with a sensor is suggested.

Silicone heaters used for freeze protection, heated enclosures, and high-limit protection are the applications well-suited for these small and low-cost thermostats.

The creep action units are constructed with a bimetal strip that bends as the temperature rises to work as a switch opening the two contacts. This provides a close differential between on/off. They are relatively accurate with a hysteresis of +/- 5°F. These physically small thermostats are often used to control the process temperature of lower powered heaters or as an over-temperature protection for larger heater.

The snap action units are often called Disc Thermostats since they are round (approximately  5/8” dia.). The disk is shaped like a dish and snaps back and forth at a pre-set temperature to make and break the contact points.

Snap action of Disc Thermostats can carry more amperage without the use of a relay compared to the Creep Action units but the temperature control is not as accurate. The differential between on and off can be as high as 20° to 30°F.

When used for over-temperature

  • The wide differential does not provide narrow band temperature control but also does not generate any radio frequency interference due to the positive make/break action.
  • They can be equipped with a “button” to reset the thermostat manually once tripped.
  • Snap Action thermostats are bonded to the heater and an over-mold cap is used to cover them.

Temperature Sensors

Any of our Temperature Sensors can be located to monitor and control our heater’s surface temperature in order to monitor the component temperature. These small sensors are held in place with a protective cover of silicone rubber and vulcanized to the heater itself.


Thermal Fuses

Thermal fuses open the circuit if the heater exceeds the selected fuse temperature. They are a one-time over-temperature protection device that can prevent heater runaway in the event that a temperature control device fails or has frozen while on.

Fuses can be preset at almost any temperature up to 460°F. These are also covered for safety since the body of the fuse can be electrically live.


Thermocouples, Thermistors and RTDs

Thermocouples, Thermistors and RTDs

These small devices are attached to the heater with a patch of silicone and are integral to the heater. CHR silicone heaters can utilize almost any type thermocouple, thermistor or RTD.

Thermocouple Types ”J” & “K” are most commonly used along with RTDs of either 100 Ohm or 1000 Ohm two conductor type.

Virtually any thermal control sensors can be incorporated onto the heaters.

These can be designed to work with the temperature controllers we provide or to work a system of your choosing.

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