50. A temperature transmitter is calibrated 100 F for 4 mA and 500 F for 20 mA.

Question

50. A temperature transmitter is calibrated 100 F for 4 mA and 500 F for 20 mA. If the transmitter output is 13 mA What temperature does the operator read? 500-100 160325 20mA-4mA 51. A pressure transmitter is calibrated 0 to 300 psig. If the transmitter detects 200 psig what milliamp reading does an instrument tech read? 52. A level transmitter is calibrated 20 inches 4 milliamps and 120 inches 20 milliamps. If the level in the tank is 60 inches what is the output of the transmitter in milliamps?

Explanation / Answer

1.Pressure transmitter

(Process variable-Lower value)/span = (mA- Lower value)/span

=>(200-0)/300 = (mA-4)/20

=>mA = 14.667

2. Level transmitter

(Process variable-Lower value)/span = (mA- Lower value)/span

=>(60-20)/(120-20)=(mA-4)/20

=>mA= 10.4

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