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Service Manual MX300-I
Teledyne Analytical Instruments 34
DO: Recalibrate after replacing batteries.
The MX300-I instrument incorporates a battery test feature that
provides the approximate amount of useful life remaining on the set of
batteries. Excessive alarm activation will wear down the battery faster
than usual.
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 R17MED sensor in liquid.
DON’T autoclave the R17MED 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. Contact your locale
Representative or Teledyne to receive a copy of the Material Safety Data
Sheet.
3.5 Calibration
Incorrect readings can often traced to improper calibration. The
MX300-I should be calibrated before each use and every 8 hours to
maintain accuracy. It must be calibrated whenever new batteries are
installed. Calibration using methods other than described below can lead
to improper operation and are discouraged.
Whenever new batteries are installed or removed for any reason,
the oxygen monitor defaults to the calibration mode with the LCD
display flashing 00.0. Only the CAL and ON/OFF (I/O) keys are