4-14 | Thermox TM2000 Oxygen Analyzer
primary calibration, then the furnace temperature set point cannot be in-
creased any further to prevent damage to the cell housing and/or furnace
assembly.
Failure limits for standard calibration -
+/- 10 mVs of the anticipated mVs for the gas concentration applied (air 0
mV expected).
+/- 5 mVs of the anticipated mVs for the gas concentration applied (2%
O2 applied, 44 mV expected at 615°C cell temp) as referenced to the actual
span gas mV reading.
T/C ratio adjustment limits for Primary Calibration -
For a cell operating temperature of 615°C, the T/C ratio low limit is 0.7
and the high limit is 1.3, which corresponds to a thermocouple indicated
temperature range of 473°C to 878°C.
If the analyzer is configured for a cell operating temperature of 615°C, the
highest possible operating temperature for the analyzer at after a primary
calibration is 878°C.
This menu option allows you to perform a primary calibration on the
zirconium oxide oxygen sensor. Perform a primary calibration on your
system rather than a regular calibration (from the Calibrate Key) in the
following cases:
When you replace your zirconium oxide oxygen cell.
When your system fails a regular calibration.
CELL TEMP °C MAX T/C RATIO MIN T/C RATIO
615 1.3 0.7
650 1.24 0.74
695 1.22 0.777
824 1.139 0.861
790 same as 824°c
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