Teledyne MD300 - Oxygen analyzer and monitor (Diving) - Manual (Page 30)

Service Manual AD300/MD300
Teledyne Analytical Instruments 30
DO: Recalibrate after replacing batteries.
The MD300 instrument incorporates a battery test feature that
indicates the approximate amount of useful life remaining on the set of
batteries. Excessive alarm activation will wear down the battery faster
than usual. The AD300 instrument continuously displays the battery
status bar graph. There is no BATT TEST key on the AD300.
The minimum detectable change in battery voltage corresponds to
an increment of about 50 hours, meaning that the battery voltage reading
may not change for several hours at a time.
If the monitor is not used for a period of 30 days or more, the
batteries should be removed prior to storage.
3.4 Sensor Maintenance
DO: check the sensor for damage or leaks before use.
DO: recalibrate after replacing the sensor.
DON’T: immerse the R17S sensor in liquid.
DON’T freeze the R17S sensor.
DON’T: open or try to repair the sensor.
Before every use, the sensor, cable and connections should be
checked. Check the sensor for leaks and condensation. Check the cable
for splitting or cracked insulation. Make sure the connections are tight
and dry.
In the event that the sensor has been damaged, consult the Material
Safety Data Sheet available from the factory or online at www.teledyne-
ai.com for handling guidelines.
3.5 Gas Sampling
3.5.1 Discrepancy in Readings
The AD300/MD300 instrument should be used to measure the
oxygen concentration exiting gas cylinder or another or life support
system. When a discrepancy in oxygen readings is detected, 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 reinstalling the