Manual Part Number:
5-06-4900-65-0
Revision Level: A
ECO 8541
File Name: MN-A-0177
Page 27
Appendix A: Ambient Air Calibration
The Model 5124BE-N1-WO analyzer, along with its remote sensor is shipped from the
factory fully calibrated for its operational measurement range. It may be necessary,
however, to perform air calibration at commissioning to account for differences in
atmospheric pressures at the installation site.
Air calibration is necessary after sensor replacement.
Air calibration can only be done through the RS-232 terminal. See Appendix D for the
procedure to set up RS-232 terminal communications
WARNING:
The ambient air calibration procedure is complicated, and should
only be performed by trained technicians.
CAUTION:
Before attempting this air calibration procedure, verify that clean,
dry, oil-free ambient air is being supplied to the analyzer as required by this manual.
CAUTION:
The Model 5124BE-N1-WO RS-232 serial communications do not have flow
control. The serial output string will not pause while the calibration input commands are being
entered into the analyzer. It is strongly recommended that the serial output string be paused while
the calibration is being performed. Type the serial output string pause command slowly.
The following are the steps to the calibration procedure:
Verify calibration is necessary:
•
Start with the analyzer in run mode.
Verify on the RS-232 terminal that the serial
output stream from the analyzer is indicating operations in the “RUN” mode. If there are
system faults active, verify that not of the system faults may cause the calibration to be
invalid. If necessary, contact factory for clarification on active system faults.
•
Flow ambient air into the process chamber.
•
Allow fifteen minutes for the sensor to stabilize.
•
Observe the display for one minute.
If the display drifts more than 0.2%, over the
one-minute period, check the ambient air source for contaminants such as a nearby
nitrogen vent.
•
Determine calibration is necessary:
If the analyzer display reads 21.0% or greater, or
the analyzer displays 20.8 or less, then calibration is necessary.
•
If calibration is not necessary:
Disconnect ambient air or calibration gas source from
the analyzer. Apply process gas that is to be analyzed to the analyzer.
Calibration procedure:
•
Reset the analyzer RS-232 serial input buffer:
Press the
“enter” key once to reset
the serial buffer. The analyzer will indicate that the serial buffer is empty by sending an
asterisk character “*”. See example below:
...
