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Selecting a temperature sensor can be sometimes tricky considering how many types and varieties are available for sale. Below you can find a comparison that will make the selection of the right temperature sensor for the required application much faster and easier.
The sensors offered in our store are divided into two types:
Fig. Thermistor symbol
A resistance sensor is, in the simplest terms, a resistor whose resistance is dependent on temperature. They differ from standard resistors in that they are much more sensitive to temperature changes. They are made of oxides, the type and proportion of which determine the thermistor's properties. This is because the resistance of the materials from which the sensor is made changes with temperature.
To this type of sensors we include RTD type sensors and NTC type sensors.
Fig. PT100 sensor
PT100 - Most Commonly Used:
Temperature range of use: -50°C to +350°C.
Due to its high accuracy and stability, it is the most widely used in industry! PT100 sensors have a very close to linear characteristic of resistance change in their measurement range -50 to +350 °C. Their disadvantage is a slightly higher price compared to other types of sensors. The Pt100 type gives a true representation of temperature in the measurement range. The name comes from "Pt" for Platinum and the number 100 comes from the resistance that the sensor has at 0°C. :-)
Advantages:
Dependence between temperature and resistance for PT 100.
Tab 1. Pt100 Sensor, Change in Resistance with Temperature.
Type NTC (Negative Temperature Coefficient):
Picture of NTC Sensor
Temperature range of use: -40°C to +125°C.
Thermistors in which the temperature change is also closely related to the change in resistance. They are characterized by high resistance at low temperatures. As the temperature increases, a sharp decrease in resistance occurs. Due to large resistance changes per °C, even small temperature changes are detected with high accuracy.
Advantages:
Figure Symbol of Thermocouple
Picture of a Thermocouple
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A temperature sensor reacts to a change in temperature by changing the voltage at its ends. Two connected different metals form a so-called thermocouple. The principle of thermocouple operation is based on the Seebeck effect, which consists in the creation of an electromotive force in a circuit consisting of two metal connections placed at different temperatures. The first connection is the end of the temperature sensor, which we place in the measurement place, and the second is the connection in the control cabinet. Thermoelectric sensors are not linear, so the measurement must be converted and compensated by the temperature regulator. The accuracy of the sensor is lower than in the case of RTD sensors, e.g. PT100, but they offer work in a much wider temperature range (-200°C to +1200°C). To this type of sensors we include: Type J and Type K.
Type J Thermocouple:
Temperature range of use: -40°C to +750°C.
Advantages:
It has less significance in the industry due to the limited range of measured temperatures (from -40°C to +750°C). Its sensitivity is 55?V/°C.
Type K Thermocouple:
Temperature range of application: -200°C to +1200°C.
Advantages:
Used in the temperature range from -200 to +1200°C. The SEM dependence on temperature for this thermoelement is almost linear, and its sensitivity is 41?V/°C.
