Temperature Sensors Comparisons
A number of Temperature Sensors / Heat Detectors are available in the market. Some of them includes:
- Thermistor (Resistive Inverse Non Linear)
- Thermocouple (Nom Linear - High Temperature Ranges)
- RTD (Resistive Linear)
- LM34 / LM35 / LM334 / LM335 (Solid State)
- Diode based Temperature sensor
THERMISTOR:
This device offers the benefit of a very high sensitivity for a range of temperatures but has a non-linear scale. Extensive mathematical calculations are required to cater for this nonlinearity. The benefit is that it is very cheap compared to others. Normally used to detect a threshold temperature and used where accuracy is not needed.
THERMOCOUPLE:
The major advantage that a thermocouple offers to us is the Temperature range. It can be used for a very wide range of temperatures but at the same time it is highly insensitive. Dedicated linearize-rs like AD594( for J-Type - Temp range: 1800'C) and AD595 ( for K-Type - Temp range: 1200'C) are used compensation / amplification / linearization purposes.
DIODE AS TEMPERATURE SENSOR:
The diode is an extremely low cost device but has the disadvantage of a non-linear scale and rates poorly on the reliability scale.
RTD:
Resistor Temperature Device gives linear change in voltage with temperature. Famous of them are PT100 and PT1000. It also has a range that is suitable for normal laboratory and typical applications like fire alarm system. The cost of the RTD sensor is also less compared to thermocouple.
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