Frequently asked questions
Which sensor type is right for my heating control?
The selection of the right sensor depends on the specifications of your heating control or thermostat. The most common sensor types in HVAC technology are Pt1000 sensors and NTC probes. Check the documentation for your control system: The new probe must have the same characteristic curve as the old one so that the display is correct. With a Pt1000 sensor, the resistance at 0°C is exactly 1000 ohms, with a Pt100 sensor it is 100 ohms. These two types are not compatible with each other.
If you are unsure, you can measure the old probe with a digital multimeter or determine the item number of the defective probe. If you have any questions about sensor selection, please feel free to contact us by phone.
Are the temperature probes compatible with my heating control?
Yes, our temperature probes are compatible with all common heating controls, provided that the sensor type and connection technology match. We offer all standard sensors (Pt100, Pt1000, NTC, KTY) as well as different connection types (2-, 3- or 4-wire).
Simply select the sensor type required for your controller in the product configurator. The connection technology depends on the cable length: for short distances up to 10 m, a 2-wire connection is usually sufficient; for longer cable runs, we recommend 3- or 4-wire technology to compensate for the line resistance.
Can I replace a defective temperature probe myself?
Usually yes, provided you observe a few important points. Make sure that the replacement part has the same technical specifications as the defective probe (sensor value at 0°C, tolerance class, connection type).
Disconnect the system from the power supply before replacing the probe. Replacing probes in immersion sleeves is particularly easy: you can pull the probe out of the sleeve without emptying the system and insert the new one. For permanently installed probes, follow the installation instructions and use thermal conduction paste if necessary to ensure optimum heat transfer.
How do I install an outdoor probe correctly?
The outdoor probe should be mounted on a north or north-west wall where it is not exposed to direct sunlight or heating exhaust air. The optimum mounting height is approximately 2.5 meters above the ground.
It is important that the probe measures the actual outside temperature and is not influenced by sunlight, waste heat from appliances or heat radiation from windows. Route the connection cable into the building in such a way that it is protected from the weather and ensure that the cable entry is properly sealed.
When and how do I use thermal conduction paste?
Thermal conduction paste is recommended if the temperature sensor is not in direct contact with the medium being measured. This is typically the case with immersion sleeves and pipe contact probes. The paste fills air pockets between the sensor and the measuring point, thereby significantly improving heat transfer.
Apply the paste thinly and evenly to the sensor sleeve before inserting the probe. The result: The probe reacts more quickly to temperature changes and provides more accurate measured values. A 10 ml tube is sufficient for many installations.
Can I change the cable length of my temperature probe?
In principle, this is possible, but there are important technical aspects to consider. With resistance sensors (Pt100/Pt1000), a longer cable influences the measured value due to its inherent resistance.
The solution: For longer cable runs, use 3- or 4-wire connection technology, which automatically compensates for the cable resistance. If you need to extend cables, use
shielded cable and make professional, permanent connections in a suitable junction box.
With NTC or KTY sensors, moderate cable extension usually has less influence on the measurement accuracy as long as the connections are reliable and corrosion-resistant.
