Honeywell BW RigRat User Manual page 53

6. After the audio-visual test, bump test, the instrument is ready for calibration.
7. Mount the calibration adapter and apply gas when the display shows "Apply test gas now."
Otherwise, the bump test will fail. Also, it may be necessary to change gas cylinders to provide
the necessary gas for each sensor bump test.
8. When the test is complete, test results are shown on the display.
BW RigRat User's Guide
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