Common Operator Errors - Ametek Thermox WDG Insitu User Manual

The cell produces zero voltage when the same amount of oxygen is on
both sides, and the voltage increases as the oxygen concentration of the
sample decreases. The voltage created by the difference in the sample gas
and the reference air is carried by a cable to the microprocessor control
unit, where it is linearized to an output signal.

NOTE

Common Operator Errors

There are some common errors to avoid. If they are avoided, your ana-
lyzer will operate with a minimum of maintenance and troubleshooting.
 Do not use pipe dope or any other contaminant that gives off combus-
tible vapor that can cause erroneous measurements on any joints of
the sample tubing.
 Do not use calibration gases if they contain a mixture of oxygen and
combustibles.
 Do not handle the cell or heater (white end) excessively. Do not try to
clean the cell. When handling, grasp by touching the seal fitting.
Because of the high operating temperature of the cell, combustible
gases that are present may burn. When this occurs, the cell will gener-
ate high millivolts and cause the display to indicate less oxygen than
is actually in the gas (net oxygen content).
All the parts inside the probe are hot and will cause severe burns if
touched. Use gloves, wrenches and care when working inside the sen-
sor cabinet.
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