Category
HVAC Duct Temperature Sensors
Measure supply and return air temperature in ducts and air handling units.
A duct temperature sensor measures supply or return air inside an AHU, so the BMS can control heating and cooling coils, heat recovery and supply air temperature. The Produal TEK is a Pt1000 sensor covering -50 to 70 °C, accurate to ±0.3 °C at 0 °C, in an IP54 housing with terminal blocks tilted at 45° for easy wiring.
1 Product · Duct Temperature Sensors
Selection guide
HVAC Duct Temperature Sensors Guide
Where to mount a duct temperature sensor
- Best location: mount the TEK after coils and fans, where the airstream is well mixed, so the reading reflects the air actually delivered rather than a stratified layer near a coil face.
- Avoid: positions directly after a heating coil, where radiant heat from the coil can skew the probe above the true air temperature.
- Sealing: always seal the duct opening around the sensor body to stop air leaking past the fitting and biasing the reading.
How to choose a duct temperature sensor
- Range: the TEK covers -50 to 70 °C, wide enough for supply, return, mixed and outdoor-air-handling duct positions on one part.
- Accuracy: ±0.3 °C at 0 °C, to EN 60751 class B, adequate for coil control and trending on most AHUs.
- Housing: IP54 plastic, suited to a plant room or ceiling void duct mounting rather than an outdoor or wash-down location.
- Installation: the 45° tilted terminal blocks and screw cover speed up wiring in a confined ceiling void.
- Signal type: choose the passive TEK for a resistance input on a short cable run; choose the TEK LL transmitter for 4 to 20 mA or a longer run.
For a 4 to 20 mA duct transmitter instead, see the TEK LL under HVAC temperature transmitters. For a stainless probe with a process fitting in an industrial duct, see RTD temperature probes.
FAQ
Common questions
What range does the Produal TEK duct sensor cover?
-50 to 70 °C, with an accuracy of plus or minus 0.3 °C at 0 °C, using a Pt1000 element to EN 60751 class B. That range covers supply, return and mixed air positions in most AHUs, including cold outdoor-air intake ducts.
Where should a supply air duct sensor be installed?
After the fan and coils, where the airstream is well mixed, rather than immediately downstream of a coil face where the air can be stratified. Positioning it too close to a heating coil also risks radiant heat from the coil skewing the reading above true air temperature.
Is a 4 to 20 mA duct temperature transmitter available?
Yes, the TEK LL duct temperature transmitter, which gives a 4 to 20 mA output instead of the TEK's raw Pt1000 resistance. Choose it when the controller only accepts an analogue current signal or the cable run to the panel is long.
Why seal the duct around a temperature sensor?
An unsealed opening lets air leak past the fitting, mixing conditioned duct air with plant room or ceiling void air right at the sensor tip, which biases the reading away from the true duct temperature. Sealing the gland or grommet keeps the measurement representative of the airstream inside the duct.
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