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I HAVE PRESSURE TRANSMITTER WITH TWO WIRES 24 VOLTS SUPPLY.IF
TRANSMITTER WILL GIVE SIGNAL TO THE DCS WHAT HAPPEN TO THE 24
VOLTS POWER SUPPLY IT WILL DROP OR REMAIN TO 24 VOLTS POWER
SUPPLY.
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Answer Posted / carl_ellis
You describe a situation with a 24Vdc power supply, a 250
ohm dropping resistor and a 2 wire loop powered transmitter
at 4.0mA
To get the voltage to vary across the transmitter, you have
to change whatever the transmitter is measuring to get its
output to change, or force an output with a HART
communicator. The loop current does not vary on its own,
it varies in response to whatever the transmitter is
measuring.
Carl's Loop Rules
The voltage across the power supply remains constant: 24Vdc
The voltage drops across the transmitter and analog input
vary with the current in the loop.
Assuming a bench setup with very short wire runs and a very
low wire resistance, then if the analog input dropping
resistor is 250 ohms, then
at 4.0mA the transmitter drops 23.0V, the AI resistor drops
1.0V
at 12.0mA the transmitter drops 21.0V, the AI resistor
drops 3.0V
at 20.0mA the transmitter drops 19.0V, the AI resistor
drops 5.0V
The sum of the voltage drops must equal the power supply
voltage.
You can bank on it.
Carl Ellis
Measure First
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