why we use 4-20 mA to do calibration of the instruments.why
we cant use 0-20 mA?
Answer Posted / ramu
For electronic Instruments operates with 24V(DC),will give
output 4-20MA and pnuematic Instruments operates with 20PSI
will output 3-15PSI.These instruments circuits are arranged
in such a manner that the out put should be as mentioned
above because you will get LENIERITY only in these
ranges.If you take 5-22 MA, you will not get lenier output
( 0%-4MA,25%-8MA,50%-12MA,75%-16MA and100%-20MA)
Is This Answer Correct ? | 6 Yes | 3 No |
Post New Answer View All Answers
A DP transmitter is used to measure the level of an open tank. The drain line of the tank is connected to a control valve, and is configured as, if the level of the tank is 90% the valve should get open 10%. And if the tank level is 10%, the valve should get open 90%. Draw wiring diagram and explain how to configure DP transmitter and control valve using HART communicator. If the span error at output is 1%, what will be the %opening of the control valve at 60% level of the tank?
What is 1:1 redundancy ?
Area classification, Equipments, Gas groups, temperature classification, Ingress protection, Fire Extinguishers.
what is commisioning procedure,2)what is is the main work in commisioning in the field tx to dcs, plz send me detail
can anyone can let me know in Eurotron Micro cal 2+ calibrator in milli amps source mode we are not able to get 20 milli amps output it only produces 1.52 milli amps out, but display shows increase in milli amps , and err6 displays, let me know how to remove the err 6.
, Instrument Index, P&ID review, I/O schedule, datasheet, DCS / Analyzers specifications, loop diagrams, hook-up drawings.
what about your moleg in pogrees with company
why we are not using the turbine flow meter in the steam service?
what is the responsibility of an instrument commissioning supervisor
Draw a wheatstone bridge circuit showing supply, meter and 3 wire RTD connection
How to Calibrate Interface Level Troll in field
what is sliding spool valves?
send me last 5 years questions asked in rrb chennai, for section engineer
How to calculate mmwc values into tonnes?
How to Calibrate Flow Switch in field