On-Off Thermostats

An on-off thermostat is a digital temperature controller that fully switches its output off when the measured temperature reaches the setpoint and switches it on again when the temperature drifts away by the hysteresis. It is used in places such as cooling cabinets, cold rooms, incubators and water heating, where it does no harm for the temperature to oscillate in a narrow band around the setpoint. In this category, GEMO, Enda and Tense models are available with NTC, PTC, J type, K type and PT100 sensor inputs, in housings such as 77x35 mm, 48x48 mm, 72x72 mm and 96x96 mm, with supplies such as 100-240 V AC, 10-30 V DC / 8-24 V AC and 10-16 V DC. Select the sensor input type by the probe you will use, the supply voltage by the control voltage in the panel, the housing dimension by the mounting location, and the number of outputs by your heating, cooling and alarm needs. Some sets come with an NTC measuring probe; verify the box contents from the product page. An on-off thermostat is not a substitute for a PID device; since its output is only on or off, the temperature oscillates around the setpoint, and processes with narrow tolerances need a PID thermostat.

Products

How to choose On-Off Thermostats

An on-off thermostat is a digital temperature controller that fully switches its output off when the measured temperature reaches the setpoint and switches it on again when the temperature drifts away by the hysteresis. It is used in places such as cooling cabinets, cold rooms, incubators and water heating, where it does no harm for the temperature to oscillate in a narrow band around the setpoint.

  • Separate sensing, motion control, logic processing and operator interface requirements.
  • Select signal type, supply voltage, communication protocol and I/O count for the machine network.
  • Verify housing size, sensing distance and PNP/NPN output polarity against the PLC input card.

Frequently asked questions

What is On-Off Thermostats and where is it used?

An on-off thermostat is a digital temperature controller that fully switches its output off when the measured temperature reaches the setpoint and switches it on again when the temperature drifts away by the hysteresis. It is used in places such as cooling cabinets, cold rooms, incubators and water heating, where it does no harm for the temperature to oscillate in a narrow band around the setpoint.

What should I compare when choosing On-Off Thermostats?

Select the sensor input type by the probe you will use, the supply voltage by the control voltage in the panel, the housing dimension by the mounting location, and the number of outputs by your heating, cooling and alarm needs.

Where can I find technical details for On-Off Thermostats products?

An on-off thermostat is not a substitute for a PID device; since its output is only on or off, the temperature oscillates around the setpoint, and processes with narrow tolerances need a PID thermostat.

On-Off Thermostats Selection Guide: Technical Criteria and Engineering Practice