Question

Give the guidelines for choosing a right sensor.

Answer 1

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Answer 2

Six Key Items to Consider When Selecting a Sensor

1. Accuracy & Precision –

Both the accuracy and precision of a given instrumentation system must be appropriate for the requirements of the system. Too high of precision can give a false impression that the reading is also accurate or can result in the system detecting noise rather than the actual desired data. A sensor with more accuracy than necessary will be more expensive and more difficult to use properly than one more appropriate to the measurement required.

2. Environment –

Selection of the proper sensor requires a good understanding of the environment in which the instrument will be operated. Many sensors can be affected by the non-ideal conditions of a production floor (such as temperature variation, vibration, humidity, chemicals, etc.) It is important to take the environment into account when selecting the sensor and its packaging, mounting, and other options.

3. Excitation – Many transducers require power to produce an output signal and it is important to provide a power source that will not introduce additional errors.

4. Signal Conditioning –

Signal conditioners and other protection circuits can provide some protection from these effects before conversion.

5. Conversion –

The analog to digital converters must be evaluated and matched appropriately to the sensors or errors can be introduced, or money wasted by overpaying for precision in one that is not present in the other.

6. Processing –

Even if signal conditioning is performed, the sensor and conversion process is full of various sources of error. Some of these errors are linear (consistent effect across the measurement range), while others are non-linear.

Whatever is done with the data, remember that a test system can only perform as well as the data that it is provided, so appropriate analysis must be done when selecting and implementing the instrumentation