Pressure Systems user manual Pressure Systems, Inc 98RK-1 & 9816 User’s Manual

Pressure Systems, Inc. 98RK-1 & 9816 User’s Manual©

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.

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