Model H1301 Recovery and Recycling System
Installation, Operation and Maintenance Manual
Revision-L September, 2019
Page 74 of 105
VII. System Maintenance Procedures
M. Pressure Controller Adjustment and Calibration
4. Pressure Transmitter Troubleshooting (continued)
l. Observe the display of the ammeter installed to the 4-20mA Loop wire connections:
the ammeter now displays the Output Signal of the Loop Pressure Transmitter. The
calibration of the Loop Pressure Transmitter may be verified by comparison of the
pressure gauge reading to the ammeter at several process tank pressure levels.
Note: the ammeter will indicate a pressure value approximately 15PSI greater than
that indicated by the pressure gauge.
The output signal of the Pressure Transmitter shall be: 64uA per 1PSIA of pressure plus
the 4mA zero offset +/-0.25% of reading. For example:
5 PSIG = 20PSIA = 4mA + (.064mA X 20) = 5.3 +/-0.013mA
25 PSIG = 40PSIA = 4mA + (.064mA X 40) = 6.56 +/-0.016mA
85 PSIG = 100PSIA = 4mA + (.064mA X 100) = 10.4 +/-0.026mA
NOTE: If the signal output of the Pressure Transmitter is found to be out of the
specified range: the Pressure Transmitter should be replaced. Contact the factory for
replacement information. If the signal output of the Pressure Transmitter is found to
be within the specified range: continue with the Pressure Controller
Calibration/Trouble Shooting Procedure.
Complete the following when the testing is complete
m. Place both the N2 Valve and Inlet Valve switches to the AUTO positions.
n. Disconnect the pressure gauge from the nitrogen vent port.
o. Shut off the nitrogen supply. Close the Manual Inlet Valve of the machine and
disconnect the nitrogen supply from the Inlet Valve.
p. Place the System Power Switch to the OFF Position.
q. Disconnect the main electrical power from the machine.
r. Install the Loop Signal Wires, back to the J4 terminal block located on the Pressure
Controller Circuit refer to figure 17.
s. Connect the main electrical power to the machine.
t. Place the System Power Switch to the ON Position.
u. Operate the N2 Valve Switch to vent the process tank to below 50 psi before
turning the machine off. DO NOT TURN THE MACHINE OFF WITH PRESSURE
HIGHER THAN 50 PSI IN THE PROCESS TANK. DO NOT RELEASE THE
PROCESS TANK PRESSURE ABOVE THE TEMPERATURE CONTROLLER
ALARM #2 SETTING THIS WILL RESULT IN EXCESSIVE AGENT LOSS.
v. Place the System Power Switch to the OFF position.
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