Maxtec MaxO2 OM-25A - Atmospheres of High Humidity; 9 Spare Parts and Accessories

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the “CAL Er” may appear. For example, if the analyzer had just been
calibrated on a known high concentration of oxygen source gas and then
exposed to ambient air, you should wait until the reading has stabilized.
If you try to adjust the display to read 20.9% before the sample line has
cleared of high concentration O2, the sensor may actually be exposed
to residual high % oxygen. The signal from the sensor would still be high
and considered “out of spec” for air, thus resulting in a “CAL Er”. The
proper procedure is to wait for the reading to stabilize before adjusting
the display. This may take 30 seconds or more.
8.4 Atmospheres of High Humidity
The MAXO
2
®
analyzer can be used in applications where the relative
humidity of the sample gas ranges from 0 to 95%, non-condensing.
However, it should be noted that water vapor exerts its own pressure in
the same manner as oxygen does in a sample gas stream.
For example, if the MAXO
2
®
analyzer is calibrated in dry gas and then
the gas is humidied, the analyzer will correctly display a reading which
is slightly lower than previously displayed. This is due to the dilution of
oxygen in the sample gas by water vapor.
Gas streams of high humidity may tend to condense on the sensor.
Condensation on the sensor may eventually affect performance. For this
reason, it is recommended that the unit be used in a vertical position,
with the barb tting pointing downward to prevent condensate from
owing onto the sensing surface.
9.0 SPARE PARTS AND ACCESSORIES
Part Number Item
R125P01-002 MAX-250 Internal Sensor
R212P91 Battery Cover
R212P17 Keypad
R212P10 LCD Display
R212P30-002 PCBA Board
Accessories
R213P02 Monitor/Analyzer Protective Carrying Case
R213M15 OM-25A Operating Instructions
R213M66 Technical Service Manual
Although normal usage will not require repair, Maxtec will make
available, on request, diagrams, descriptions and instructions to assist
user’s appropriately qualied technical personnel in repairing and
replacing broken or worn components.