Teledyne MD300 - Oxygen analyzer and monitor (Diving) - Manual (Page 26)

Operation AD300/MD300
Teledyne Analytical Instruments 26
2.3.4 Discrepancy in Readings
When a discrepancy in oxygen readings is suspected, the oxygen
analyzer readings should be verified by checking the AD/MD300 battery
condition and calibration using 100% oxygen. If the monitor can be
calibrated, the unit can be assumed to be in good working order and
capable of providing readings to specification. If, after checking the unit,
the discrepancy in oxygen readings persists, the gas being analyzed
should not be used. Further investigation should be made until the
discrepancy in readings is resolved. The troubleshooting section of this
manual may provide additional assistance in locating the problem.