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CALIBRATION
9 - 4
ETC00781(4) Series 100 e 02/2004
9.1.2 Spanning
Verification of the span calibration is essential for accurate concentration measurement.
Spanning can be performed only after zeroing has been done.
Spanning will set the actually measured gas concentration to the entered “span gas setpoint”.
Note: 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 make use of pressure correction
(see chapter 8.1) !
MANUAL SPANNING