RTD stands for resistance temperature detectors, it is used to measure temperature. RTD is generally high repeatability, good precision, Accurate, and repeatability compared to a thermocouple. So here this post gives information about the advantages and disadvantages of RTD to better understand this topic.
Advantages of RTD:
- Very stable output
- Most accurate
- Linear and predictable
- High accuracy
- High repeatability
- Good precision
- Low Drift
- More linearity compare to a thermocouple
- No special wire required for installation, easily install and update
- It is available for in wide range
- It can be used to measure differential temperature
- No necessity of temperature compensation
- Stability maintained over a long period of time
- They are suitable for remote indication
- Easy to verify and recalibrate
- RTD does not require a special extension cable
Disadvantages of RTD:
- High initial cost
- Low sensitivity
- It requires a more complex measurement circuit
- Large bulb size
- Low absolute resistance
- Current source needed
- Less rugged in a high vibration environment
- A bridge circuit is needed with power supply
- Shock and vibrations affect the reading
- Point sensing is not possible
- A circuit is little more complicated as it 34/4 wire measurement
- Costlier as compared to other sensors like thermocouples
- Slower response time than a thermocouple
- More limited temperature range
- Possibility of self-healing
- Power supply failure can cause an erroneous reading
- It can be avoided in industries for ranges above 650 deg. C
- The RTD requires more complex measurement circuit
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