Ametek CEM/Humox, User Manual

Page: 58 / 136

4-14 | Thermox CEM/Humox Analyzer
This menu option allows you to perform a primary calibration on the zirconium
oxide oxygen sensor. You will wish to perform a primary calibration on your system
rather than a regular calibration (from the Calibrate key) for the following cases:
•
When you replace the zirconium oxide oxygen cell or thermocouple.
•
When your system fails a regular calibration due to a deteriorating cell.
You should always attempt to perform a regular calibration before
resorting to a primary calibration for all cases other than when you
install a new cell. If you find that a regular calibration isn’t working
correctly, first check that your calibration gas values match the values
written on the gas cylinders; also be sure that the correct flow of gases
have been set and that the gases are allotted enough time to flow through
the sensor. Only if these checks have been made and the system still
can’t be properly calibrated should you perform a primary calibration.
Make sure you have properly entered your calibration gas values using
the Cal Gas Values option from the Calibrate key before starting your
primary calibration (see the “Cal Gas Values” section in the Calibrate
Key Chapter for help).
1. Select Primary Calib from the Setup key.
2. You will be placed into a manual calibration, where you will be told to inject
your span gas into the calibration gas inlet port.
From this point, operations work as they do for a regular calibration. Please see
the “Initiate Cal/Initiate Verify” section in the Calibrate Key chapter for help
on how to perform the calibration.
Upon completion of the primary calibration, the system will notify you
that a standard calibration is required by displaying a Calibration
Required message (see the “Calibrate Key” chapter for help on how
to perform a standard calibration). Sensor readings on the display will
not be accurate until the regular calibration is performed. In addition,
a 15 minute recovery time follows the primary calibration to allow the
cell to stabilize. After this 15 minute stabilization period, perform the
regular calibration.
During the recovery time immediately following the primary calibra-
tion, you may see some temperature related error messages. You can
ignore these messages and assume no problem exists. This is because
after a primary calibration, the cell temperature is adjusted.
NOTE

NOTE
