Ametek Thermox 2000 ATEX Series, Руководство пользователя

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4-14 | Thermox Series 2000 WDG-HPII / HPIIC - ATEX
mary calibration and then attempt a standard calibration again. If you
get an excess cal error during primary calibration, then the furnace
temperature set point cannot be increased any further to prevent dam-
age 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, 48 mV expected at 695°C cell temp) as referenced to
the actual span gas mV reading.
T/C ratio adjustment limits for Primary 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
For a cell operating temperature of 695°C, the T/C ratio low limit is .777
and the high limit is 1.222, which corresponds to a thermocouple indi-
cated temperature range of 540°C to 848°C.
If the analyzer is configured for a cell operating temperature of 695°C,
the highest possible operating temperature for the analyzer at after a
primary calibration is 848°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:
y
When you replace your zirconium oxide oxygen cell.
y
When your system fails a regular calibration.
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.
NOTE