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what is the principal of flow transmeter,level trans
meter,presser transmeter?
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Answer Posted / kathirvan.b
Basically TRANSMITTER is a device which transmits the
signal based on its input signal.There is a difference
between the excitation signal and input signals.The
excitation signal may be air signal(less than or equal to
15 PSI)known as pneumatic transmitter OR electrical signal
(+24V DC or 110 V AC) known as electronic transmitter.Then
the output signal will be 3 to 15 PSI for pneumatic
transmitter and 4 to 20 mA for electronic transmitter.
Then the input given to the transmitters may be of FLOW or
LEVEL or PRESSURE.Based on this input given to
transmitter,it produces a output accordind to process input.
STEP I: [LEVEL MEASUREMENT]
The level sensor may of any type (eg:air purging system)
which measures the leves with the appication of ~20 PSI
inlet pressure,because of back pressure the output air
pressure taken back and given to the transmitter,it
produces 4 to 20 mA or 3 to 15 PSI based on the natuire of
transmitter given to the control room.
STEP II: [PRESSURE MEASUREMENT]
The same procedure for each ,transmitter just measures the
process variables ans produces the output based on the
application of process inputs.
FINALLY TRANSMITTERS ARE SAME BUT THE INPUT,EXCITATION
AND OUTPUT SIGNALS MAY VARIED.
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