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Pressure Systems, Inc. 98RK-1 & 9816 User’s Manual©
Page 143 www.PressureSystems.com
98RK-1 SUPPLY air transducer. Verify the valve position through the ‘q0B’
command and front panel LEDs. This command reflects the actual sensed
calibration valve position in the Model 9816 Intelligent Pressure Scanner.
● At Re-zero, CAL-REF pressure should be identical to CAL. Typically, both
inputs are at atmosphere. However, if you are planning to do a Span
Calibration, and the CAL port is connected to a pressure generator, then there
is a probability of “trapped pressure” in the CAL line, and atmosphere on the
CAL REF port. As a result, the Re-zero procedure will compensate for a false
offset. If the CAL port is connected to a pressure generator, you must take
care to ensure the CAL REF pressure is identical to the CAL pressure at Re-
zero time.
● CAL valve position errors are common. Re-zero assumes the Cal valve is in
the “RUN” position to begin the event. It then moves the valve to the “CAL”
position, does the Re-zero, and returns the valve to the “RUN” position. This
default behavior may be defeated by the 'w0B' command.
SPAN CAL does not move the CAL valve at all. If you have SPAN CAL
pressure applied to the CAL port, you must shift the valve into the “CAL”
position using the ‘w0C’ and ‘w12’ commands. After the calibration, you must
shift the valve back to the “RUN” position. Failure to do any of these valve
shifts may induce errors into your system.