Category
HVAC Water Temperature Sensors
Immersion, strap-on and frost guard sensors for chilled water, hot water and coil protection.
A water temperature sensor measures chilled, heating or domestic hot water for control and coil protection, as an immersion probe in a pocket or a strap-on sensor clamped to the pipe. Produal's Pt1000 range covers TEAT and TENA immersion sensors, TEPK and TEP strap-on sensors, and the fast-response TEV frost guard, from -50 to 120 °C depending on model.
5 Products · Immersion & Water Temperature Sensors
Selection guide
HVAC Water Temperature Sensors Guide
How a water temperature sensor works
An immersion sensor sits inside a thermowell (pocket) threaded into the pipe, in direct contact with the water for a fast, accurate reading. A strap-on sensor clamps to the outside of the pipe with an adjustable tie, sensing through the pipe wall, which is slower to respond but needs no pocket and no draining of the system to fit.
How to choose a water temperature sensor
- New installation with a pocket: choose the TEAT immersion sensor, an AISI 316L probe on an R½" thread, -50 to 120 °C, ±0.3 °C at 0 °C, with a 5 s time constant.
- Domestic hot water: choose the TENA immersion sensor, designed specifically for fast response on hot water systems, also R½" thread.
- Retrofit without draining: choose the TEPK strap-on sensor, -20 to 80 °C, fitted with an adjustable tie directly to the pipe.
- Radiator circuits: the TEP strap-on, using a T1 element, covers -50 to 120 °C for radiator temperature measurement.
- Freeze protection: the TEV frost guard sensor is built for fast response, on an R¼" thread, to catch a falling coil or radiator temperature before it freezes.
- Accuracy priority: immersion sensors are more accurate than strap-on, since they contact the water directly rather than sensing through the pipe wall.
For a 4 to 20 mA version, see the TEAT LL under HVAC temperature transmitters. For an industrial process probe with a different thread or wetted material, see RTD temperature probes.
FAQ
Common questions
Immersion or strap-on sensor for water temperature?
Choose an immersion sensor, such as the TEAT or TENA, for the best accuracy, on a new installation where a thermowell pocket can be fitted. Choose a strap-on sensor, such as the TEPK, for a retrofit onto existing pipework, since it clamps on with an adjustable tie without opening or draining the pipe.
Which sensor protects coils from freezing?
The TEV frost guard sensor, built for a fast response time on an R¼ inch thread, so a falling coil or radiator temperature is caught quickly enough to trigger a frost protection sequence before ice forms. Its speed matters more here than the wider range of the immersion sensors.
Which sensor suits domestic hot water?
The TENA immersion sensor, which Produal designs specifically for domestic hot water systems, with a faster response time than the general-purpose TEAT and the same R½ inch thread for fitting into a pocket.
What temperature range does the TEAT immersion sensor cover?
-50 to 120 °C, accurate to plus or minus 0.3 °C at 0 °C, using an AISI 316L stainless steel probe on an R½ inch thread with a 5 second time constant. That range and material suit chilled water, heating water and most process water duties in a plant room.
Can a strap-on sensor be fitted without draining the system?
Yes, that's its main advantage. The TEPK strap-on sensor clamps to the outside of the pipe with an adjustable tie, so it can be added to a live, full pipe during a retrofit, unlike an immersion sensor which needs a pocket welded or threaded into the pipe beforehand.
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