# Factors that influences while choosing a Transducers

**URL:** <https://forumautomation.com/t/factors-that-influences-while-choosing-a-transducers/2353>\
**Category:** Field Instrumentation\
**Tags:** transducer, instrumentation\
**Created:** [September 27, 2017, 3:24pm UTC](https://forumautomation.com/t/factors-that-influences-while-choosing-a-transducers/2353 "2017-09-27T15:24:30Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sivaranjith](https://forumautomation.com/letter_avatar_proxy/v4/letter/s/ba9def/32.png) [@sivaranjith](https://forumautomation.com/u/sivaranjith)\
**Post date:** [September 27, 2017, 3:24pm UTC](https://forumautomation.com/t/factors-that-influences-while-choosing-a-transducers/2353/1 "2017-09-27T15:24:31Z")

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Transducers are often employed at the boundaries of automation, measurement, and control systems. Before choosing a transducer we have to ensure that the transducer is suitable for our need. These are factors which may influence the selection.

**Operating principle:**

There are operating principles such as resistive, inductive, capacitive, piezoelectric, photo-voltaic, ionization etc., . **Sensitivity:**

Transducer must be sensitive enough not to give an output, but to give an detectable output.

**Operating range:**

A transducer should have good resolution over it’s entire range of operation. We cannot choose a temperature sensing transducer that work in range 0-100 degree Celsius for a use in boiler where temperature is up to 1000 degree Celsius, that’s what it means.

**Accuracy:**

High degree of accuracy is needed and small value of repeatablity.

**Cross-sensitivity:**

Cross-sensitivity must taken into account while measuring mechanical quantity. Cross-sensitivity must reduced. Because when transducer subjected to measure variations in one plain, while actual quantity to be measured is in another plain.

**Error:**

A transducer must avoid error. For which a transducer should maintain expected input output relationship by it’s transfer function.

**Transient & Frequency response:**

Transducer should meet desired time domain specifications such as peak over shoot, raise time, setting time & small dynamic error, it should flat frequency response curve with higher cut-off frequency at high limit in-order to have a high value.

**Loading effect:**

Transducer should have high input impedance and low output impedance to avoid loading effect.

**Environment compatibility:**

Under specified environment conditions the transducer maintain input-output relationship and doesn’t breakdown. Transducer should be able to withstand temperature, pressure shock etc., when subjected to it, if it is application require so.

**Insensitivity to unwanted signals:**

Noise should be avoided in measuring, so that a good transducer should insensitive to unwanted signals. But high sensitive to desired signals.

**Usage and ruggedness:**

Ruggedness both of mechanical and electrical intensities of transducer VS it’s size and weight must be considered while selection.

**Electrical aspects:**

Length and type of cable required must be considered. Signal to noise ratio must be taken care. Frequency response limitation must be taken to account.

**Stability & reliability:**

Should have high degree of stability during it’s operation & storage life. Reliability should be assure in case of failure of transducer in-ordered that functioning of the instrumentation system continues uninterrupted.

**Static characteristics**

Apart from low static error transducers should have a low non linearity, high resolution, and a high degree of repeat-ability. Transducer selected should be free from temperature effect and load alignment effects. it should not need frequent calibration.