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CALIBRATION
9 - 1
ETC00781(4) Series 100 e 02/2004
9. Calibration
To insure correct measurement results, zeroing and spanning should be carried out once a week.
Spanning can be performed only after zeroing before.
For the calibration procedure the analyzer has to be supplied with unpressurized test gases
through the respective gas inlets (cf. chapter 5.3) at a gas flow rate of about 1 l/min (the same
as with sample gas) !
After switching on the analyzer, wait at least approx. 15 to 50 minutes
(depending on installed detectors) before admit gas to the analyzer !
Note !
For operation with optional, internal or external solenoid valves the solenoid valves are activated
automatically by the respective function (via digital outputs). If the analyzer is in “calibration mode”,
a digital status signal “calibration” may be set (see chapter 11.3).
Zeroing
For zeroing, the analyzer has to be flushed with nitrogen (N
2
) or adequate zerogas
(e. g. synth. air or conditionned air).
Spanning
The span gas concentration should be in a range of 80 % - 110 % of full - scale range !
For lower span gas concentrations the measuring accuracy could be decreased for
sample gas concentrations which are above the span gas concentration !
Spanning for oxygen measurement can be done using ambient air as span gas, if the
oxygen concentration is known and constant.
When using span gas mixtures the entry for “C.Cal” must be set to “0” (see chapter 8.3)!
If there is no built-in pressure sensor, the correct pressure must be entered before
performing the calibration, if you want to have the possibility of pressure correction
(see chapter 8.1) !