Equipment
Pressure Transmitter range (0 to 300 psig ) “must be Hart enabled”
Pressure source, range (0 to 350 or more than)
Hart communicator
24vdc power supply
Calibration Procedure
-
Connect the Hart communicator with the transmitter
-
Connect its terminals across the 250 Ohms resistor connected in series of power supply to the transmitter
-
When Hart communicator detects your device then go into its setup
-
Adjust the range through the option lower/upper range value
-
Set lower range value to zero (0) and upper range value to 300 psig
-
Set the zero by zero trim option (given pressure must be zero)
-
Apply 300 psig pressure to the transmitter and set it the 100% range value of transmitter by span trim option
-
After this setting check the 0 and 100% out put by connecting also multi meter in the series of the power supply
-
At 0 psig pressure multi meter must read 4ma
-
Apply the 300 psig where multi meter must read 20ma
-
Repeat this practice two or three times your transmitter will be calibrated when it matches its output reading match to the input