Outdoor temperature sensor

THERMASGARD® outdoor temperature sensors (passive) are available as surface-mounted or pipe-mounted sensors.
They are used to precisely measure the outside temperature - e.g. in damp rooms, on pipes to measure the surface temperature or directly outdoors.
Ideal for applications in heating, air conditioning and building automation systems where reliable temperature data is required.

Guide and useful information about outdoor temperature sensors

Guide to outdoor temperature sensors

A look back

Long before digital sensors found their way into building automation, the outside temperature was measured using purely mechanical or liquid-based measuring systems. Classic bimetal thermometers used the different expansion rates of two metals, while liquid thermometers were based on the temperature-dependent volume change of alcohol or mercury. These measuring principles enabled reliable temperature readings early on and formed the basis for weather-compensated heating controls. Today, these physical effects still form the basis of modern electronic outdoor temperature sensors – only now they are significantly more precise and faster.

Content

How does an outdoor temperature sensor work? Typical applications of an outdoor temperature sensor for HVAC What to look for when buying an outdoor temperature sensor Outdoor temperature sensor from S+S

As the name suggests, an outdoor temperature sensor measures the temperature outside buildings, systems or vehicles.

Temperature sensors such as NTC or PT1000 are used, which precisely detect temperature changes and convert them into electrical signals. These signals enable a heating control system, for example, to react automatically to falling outside temperatures - efficiently and in an energy-saving manner.

Correct positioning is crucial: the sensor should not be exposed to direct sunlight or sources of interference such as exhaust air ducts.

Typical areas of application for HVAC

heating systems:
For weather-compensated flow temperature control according to the heating curve - e.g. in combination with boiler or heat pump controls.
Ventilation and air conditioning systems:
For temperature-dependent control of ventilation volume flows, damper positions or cooling capacities - especially in larger buildings or systems with BMS/GLT connection.
Building automation & MSR technology:
In smart building systems, outdoor sensors serve as input signals for numerous control strategies, such as demand-based air conditioning, shading or enabling heating/cooling circuits.
Refrigeration and technical centers:
For monitoring and control in outdoor areas of technical systems - e.g. for frost protection monitoring or for controlling recooling plants.
Industrial & functional buildings:
In areas exposed to the weather, e.g. halls, warehouses or machine houses, outdoor temperature sensors provide reliable values for energy-efficient operation.

Wherever temperature data forms the basis for intelligent control or safety systems, these sensors ensure reliable values.

What you should look out for when buying

The requirements for outdoor temperature sensors in HVAC technology are high - especially when they are integrated into building automation systems, central heating systems or ventilation systems.
To ensure that the sensor works reliably and provides permanently correct values, you should pay attention to the following criteria:

Measurement characteristics & sensor type:
Different sensors are used depending on the system requirements - e.g. PT1000 or NTC 10k. Compatibility with the control technology used (e.g. WAGO, Siemens, SAIA etc.) is important.
Rule relevance & accuracy:
Precise detection is crucial in weather-controlled heating systems or for frost protection functions. Pay attention to small tolerances in the relevant temperature range (e.g. -20 °C to +40 °C).
Mounting type & sensor type:
Depending on the installation location, different designs are available - wall sensors, surface-mounted sensors, pipe-mounted sensors or combinations with weather protection hoods for exposed locations.
Housing quality & protection class:
At least IP54 is required for outdoor use - IP65 is better if direct weathering or an industrial environment is to be expected. The housing should be UV and temperature resistant.
Cable routing & ease of installation:
Make sure there is sufficient space in the connection compartment, well-labeled terminals and options for different cable types. Some models offer pre-assembled cable lengths or quick installation systems.

Discover our selection of outdoor temperature sensors now

Outdoor temperature sensor for precise HVAC control - direct from the specialist supplier

As a specialist in measurement and control technology, we offer you a wide selection of outdoor temperature sensors for professional use in heating, ventilation and air conditioning systems.
Whether for building automation, industrial applications or classic heating technology - our sensors stand for reliability, precision and durability.
Discover high-quality models with different sensor types, types of protection and mounting options - suitable for your application.

Select outdoor temperature sensor for your application now

FAQ

Where should an outdoor temperature sensor be installed?

If possible, the sensor should be installed in a shady location protected from the weather - ideally on the north side of a building to avoid direct sunlight. This is because the sun, exhaust air pipes or other heat sources can falsify the measurement results.

If installation in such locations is not possible, special weather and sun protection housings are recommended to protect the sensor from environmental influences and ensure correct temperature detection.

What protection class should an outdoor temperature sensor have?

Sensors with at least IP54 protection are recommended for outdoor use. In particularly humid environments (e.g. in industry or on façades without roof overhang), IP65 or higher may also be appropriate.

Can an outdoor temperature sensor also be installed on pipes?

Yes, there are special pipe contact sensors that are used to measure the temperature of heating or cooling pipes. Good thermal coupling (e.g. using heat-conducting paste) and suitable insulation against environmental influences are important here.

What to do if the measured values fluctuate greatly?

Fluctuating values may be due to incorrect installation locations (solar radiation, draughts, exhaust air) or unprotected sensors. Correct positioning, a sun protection housing if necessary or checking cable connections and contact resistances can help here.

Are there differences between sensors for indoor and outdoor temperature?

Yes, outdoor temperature sensors are specially designed for weather resistance (UV-stable, suitable for damp rooms, larger temperature ranges). They often have a robust housing and are mechanically more resistant than indoor sensors.

We also manufacture individually

Do you have special requirements? As a manufacturer with our own production in Germany, we are always able to produce outside the standard range.

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Outdoor temperature sensor

Guide to outdoor temperature sensors