Indoor probes are used to enable room temperature-controlled heating and air conditioning systems to respond quickly and reliably to temperature fluctuations. Testo Sensor offers various room temperature sensors with different sensor characteristics and housing designs.
We often get questions like: What should I look for when selecting an indoor probe? Or how can I install my room temperature sensor correctly? That is why we have compiled this guide for you.
Room temperature probes should be of high quality and at the same time most cost-efficient. Heating and air conditioning systems can only be operated efficiently if the indoor probes measure the temperature reliably and within specification. At the same time, the probe should operate with long-term stability over its entire service life of 15 years.
How does an indoor probe work?
Room temperature probes measure the air temperature and transmit the value to the heating system. This allows the heating or air conditioning system to control the heating output so that the room temperature remains constant at the value set on the thermostats, even if weather conditions change. For correct operation, on the one hand, it is necessary to have a faultless installation in a place free of environmental disturbances. In addition, the characteristic curve of the probe should match the one stored in the heating system.
What are the different types of indoor probes?
All room temperature probes have one feature in common: The measuring element is installed in a housing and is protected by it. The housing also contains the connection terminals to which the user can connect his cable for signal processing. To ensure an optimal air supply, the housings have air inlet slots. Therefore, the indoor probes may only be used indoors. The housing designs differ only in appearance.
We offer a room temperature probe in the classic design. This measures the air temperature in the room.
Our room radiation probe is used to measure the radiant heat for safe and constant temperature detection and control indoors.
You can find all room temperature probes here in the overview.
In addition, outdoor temperature probes also differ according to which sensor has been installed and how the probes are connected to the heating system.
At Testo Sensor we offer indoor probes with these sensors:
- Pt100: Pt100 Cl. A, Pt100 Cl. B
- Pt1000: Pt1000 Cl. A, Pt1000 Cl. B
- NTC: 5kOhm, 10kOhm, 20kOhm
- KTY: KTY81-110, KTY81-210
We offer the Pt sensors and the Ni1000 sensor in two-, three- or four-wire circuit.
What should I pay attention to when choosing the right indoor probe?
The correct selection of the temperature probe depends on your measuring task and the associated requirements for the temperature probe.
- Do you want to measure the air temperature?
- Or do you want to measure radiant heat?
- What characteristic curve must your sensor have?
Answering the following questions can help you with your selection:
What design do you need?
Select a design that best fits your measurement task.
What is the right sensor?
Pay attention to whether and if so what type of sensor your heating system specifies. Especially with NTC sensors, please check carefully whether the characteristic curve of the sensor matches the characteristic curve stored in your heating system. If necessary, you will find this information in the operating instructions. You can find the characteristic curves of our sensors here in the overview or also in the operating instructions, which you can download for each sensor type.
What is the correct connection type for your temperature sensor?
Pt-sensors and Ni-sensors are also available as three- and four-wire versions. Please check on your measuring device whether you need a three-wire or a four-wire.
Which connection cable do you need?
Our room temperature sensors are delivered WITHOUT a connection cable. If you need one, please order the appropriate connection cable. Pay attention to whether you need a two-wire, three-wire or four-wire version.
We offer the following options:
What do I have to consider when mounting the indoor probe?
Our indoor probes are supplied with mounting material. You can find the information about the drill holes in the operating instructions. There you will also find information on the exact installation location. You should avoid disturbing influences such as sunlight, but also heat sources such as windows or air vents. Please also make sure that the air movement is not obstructed by furniture or curtains and thus does not reach your room temperature probe. Please also order a suitable connection cable, this is not included in the scope of delivery. Depending on the installation location, it may be useful to order a sunshade or a ball throw protection.