System Overview | 2-17
Common Operator Errors
If you follow the steps below, your analyzer will operate with a minimum
of maintenance and troubleshooting.
• Connect the air supply to the aspirator air supply inlet but DO NOT
turn on the air until the sensor is at operating temperature. If the ana-
lyzer is turned off or the process is shut down, the aspirator air should
be turned off to avoid plugging problems.
• If your process is running and the analyzer is installed on the pro-
cess, the analyzer must have power applied to it to prevent plugged
plumbing and sensor component damage. The case heaters must be
on if the process is running to maintain sensor plumbing above 200°C.
• Do not use pipe dope or any other contaminant that gives off combus-
tible vapor on any joints of the sample tubing.
• For O2 calibration gases, do not use calibration gases to check AM-
ETEK/Thermox analyzers if they contain a mixture of oxygen and
combustibles. Note, however, that this is acceptable for combustibles
span gases (used only if you purchased the combustibles option).
• Always introduce calibration gases at the recommended flow rate of
3.0 scfh.
• When working on the plumbing inside the sensor cabinet, turn the
power off.
• Use caution if performing maintenance on the sensor while the pro-
cess is running. Removing any part of the sensor can allow process
gases and gases of high temperature to escape into the sensor.
• Do not handle the cell excessively. Do not try to clean the cell except
by rinsing. If you need to handle the cell, grasp by touching the seal
fitting at the top; never touch the bare part of the cell.
• Do not remove a cell or type “K” thermocouple that you may want to
use again when the inside of the furnace is still hot - severe thermal
shock can be destructive to either of them.
• Always replace the metal cell O-ring when replacing the oxygen cell.
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