Answer Posted / pankaj nandasana

As you know....0.2 to 1 kg/cm2 is equal to 3-15 psig..
Generally we are considering this range...reasons are following...

1) Suppose if your have set lower limit at 0 psig, then how you can differentiate zero signal level and pipe breakage..!!!! You can not distinguish two thing..That why we select some elevated range from 0 psig.

2) Our all instrument are producing linear response in the range of 3-15 psig.

3) Pneumatic supply to all instrument is 20 psig..so alway there is bleading of air from instrument..for standardlisation purpose all are considering 3-15 psig..

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