Answer / rijo dennis

A Flow transmitter will produce 4-20mA as its output. According to the differential pressure applied to the diaphragm of the D.P it will produce electrical signal. In the cause of the flow the out put current will be in the square root proportional mode, i.e
input= 0% then output= 0% 4.00 mA
input= 25% then output= 50% 12.00 mA
input= 50% then output= 70.71% 15.31 mA
input= 75% then output= 86.60% 17.85 mA
input=100% then output= 100% 20.00 mA

For a level transmitter it will be operated in linear mode,i.e,
input= 0% then output= 0% 4 mA
input= 25% then output= 25% 8 mA
input= 50% then output= 50% 12 mA
input= 75% then output= 75% 16 mA
input=100% then output= 100% 20 mA

The same DP(Differential pressure) Transmitter can also used for both flow and level,but the one and only change in the mode of operation. flow is proportional to the
square root of the DP,but floe is directly proportional.

I have transmitter of range -20 to -5 kpa.if it is possible to zero trim with atmospheric pressure,means HP and lp having no pressure...what will get after zero trim and it is the right way.....plz give me reply ....

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