Resistance-based temperature sensors
PTC thermistor (PTC: Positive Temperature Coefficient):
These sensors, such as Pt100 or Pt1000, increase their resistance as the temperature rises and offer high accuracy and stability. A major advantage of these sensors is that the characteristic curve is linear and they are uniformly standardized. For example, the resistance of a PT1000 sensor at 0°C is always 1000 Ohm.
With S+S Regeltechnik we offer you the following PTCs (thermistors) depending on the temperature sensor:
- Pt100 sensors: Pt100 class A, Pt100 class B, Pt100 1/3 class B, Pt100 1/10 class B
- Pt1000 sensors: Pt1000 class A, PT1000 1/3 DIN class A, PT1000 1/10DIN class A, Pt1000 class B
- Ni sensors: Ni1000 1/2 DIN Class B, NI1000 Class B
- NI1000TK5000 sensors
- LM235Z
- KTY sensors: KTY81-210, KTY81-110, KTY11-6
As we attach great importance to customer satisfaction, we can of course also install sensors that are not listed. To do this, simply send us a Request.
Thermistors (NTC: Negative Temperature Coefficient):
Thermistors reduce their resistance as the temperature rises and consist of metal oxides or semiconductors.
S+S Regeltechnik has the following NTCs (thermistors) in its range:
- NTC1.8K
- NTC2.2K
- NTC10K
- NTC10K Precon
- NTC10K Carell characteristic curve
- NTC20K
As we attach great importance to customer satisfaction, we can of course also install sensors that are not listed. To do this, simply send us a Request.
Basically, the higher/better the class, the more accurate the sensor. This accuracy is categorized in the DIN classes. The picture shows the different tolerances of the various sensor types. S+S offers you this in the Download area under "Useful information" for download. In the PDF you will also find the resistance table for each sensor
Thermocouples
Thermocouples consist of two different metals that generate a low electrical voltage when there is a temperature difference. They are ideal for use at high temperatures and offer a fast response.
Selection criteria for temperature sensors
1. design of the temperature sensor
The design of the sensor depends on the type of measurement and the area of application:
- Insertion sensorFor core temperature measurements in liquids or solids.
- Screw-in sensorFor measuring in liquid or gaseous media, e.g. in heating technology.
- Cable sensorFlexible use for a wide range of applications.
- Surface sensorFor measuring the temperature of surfaces.
- Pipe contact sensorFor indirect measurement of the temperature of pipes.
S+S Regeltechnik offers you 4 out of 5 of these types of sensors: Screw-in sensors, cable sensors, surface sensors and pipe contact sensors.
2. sensor type
Different sensor types can be used depending on the requirements:
- Pt100/Pt1000Precise measurement, ideal for industrial applications.
- NTC: Cost-effective and quicker response, suitable for household appliances, among others.
- ThermocouplesFor high temperatures and fast reaction times.
The figure shows the characteristic curves of several sensors for illustration purposes. In this case, the graph on the left shows the characteristic curve of a PT100 and PT1000 sensor. The graph on the right shows the NI1000 and NI1000 TK5000 sensors.
3. sensor cable (cable temperature sensor)
Here too, there are different cable types that are used depending on the requirements. These differ mainly in terms of the cable material and the corresponding minimum/maximum temperature:
- PVCLiYY 2x0.25mm²: -35...+105°C/ -31...+221°F
- SiliconeSiHF 2x0.25mm²: -50...+180°C/ -58...+356°F
- PTFE2x1.0mm²: -50...+250°C/ -58...+482°F
- Glass silk2x0.25mm²: -50...+350°C/ -58...+662°F
4. measuring medium and temperature range
Take into account the medium in which the measurement is to take place (air, liquid, gas) and the required temperature range:
- Air: Room and outdoor temperature sensor.
- Liquid: screw-in and immersion sensors.
- High temperatures: Thermocouples.
5. mechanical connection
Make sure that the sensor can be mechanically integrated correctly into the process. Select the appropriate thread size, sleeve length and sleeve diameter.
6. environmental conditions (IP protection class)
Take into account the ambient conditions such as Pressure, Humidity, Dust and chemical influences. Select suitable materials and protection classes (e.g. IP protection classes).
What applications do passive temperature sensors have?
Passive temperature sensors are versatile and are used in a variety of industries and applications to ensure accurate temperature measurements. Some of the following examples represent the main industries in which our customers use our sensors. By no means does this include all applications and areas of use for temperature sensors.
