Category
HVAC Outdoor Temperature Sensors
Outdoor temperature input for weather-compensated heating and HVAC control.
An outdoor temperature sensor feeds the BMS the input it needs for weather-compensated heating, ventilation free cooling and frost protection. The Produal TEU is a Pt1000 sensor covering -50 to 50 °C, accurate to ±0.3 °C at 0 °C, in an IP54 housing with cable entry facing downwards to shed rain.
1 Product · Outdoor Temperature Sensors
Selection guide
HVAC Outdoor Temperature Sensors Guide
What outdoor temperature is used for
Heating systems use it to adjust flow temperature so the building doesn't overheat on mild days and stays warm on cold ones, a control strategy called weather compensation. Ventilation systems use the same signal to decide when free cooling with outdoor air is worthwhile, and to trigger frost protection on coils and pipework. The BMS can also log it alongside energy consumption to see how usage tracks the weather.
How to install an outdoor temperature sensor
- Orientation: mount on a north-facing or shaded wall, out of direct sun, which would otherwise push the reading above true outdoor air temperature.
- Clearance: keep it away from windows, vents, exhausts and other heat sources that leak building warmth into the reading.
- Height: mount high enough to avoid tampering, and clear of snow build-up or splash from ground level.
- Housing: the TEU's IP54 rating and downward cable entry are built for permanent outdoor exposure.
- Range: -50 to 50 °C covers all normal Indian climate extremes on one part.
For a 4 to 20 mA version for longer cable runs, see the TEU LL under HVAC temperature transmitters.
FAQ
Common questions
Which wall is best for an outdoor air temperature sensor?
On a north-facing or shaded wall, away from direct sun, windows, vents and exhaust outlets that would otherwise warm the reading above the true outdoor air temperature. Mount it high enough to avoid tampering and clear of ground-level snow or splash.
What range does the Produal TEU outdoor sensor cover?
-50 to 50 °C, accurate to plus or minus 0.3 °C at 0 °C, using a Pt1000 element to EN 60751 class B in an IP54 housing. The downward-facing cable entry helps shed rain and keeps moisture out of the terminal compartment.
What is weather compensation in HVAC?
It's a control strategy where the heating flow temperature is automatically adjusted according to the measured outdoor temperature, so the building gets just enough heat on a mild day and more on a cold one. It reduces overheating and cuts energy use compared with a fixed flow temperature.
Is a transmitter version of the outdoor sensor available?
Yes, the TEU LL, giving a 4 to 20 mA output instead of the TEU's raw Pt1000 resistance. Choose it for a long cable run between the sensor and the BMS panel, or when the controller only accepts an analogue current input.
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