ABB EL6010, Руководство оператора

Страница: 38 / 76

36 EL6010 Gas Analyzer in Category 2G Operator’s Manual 42/24-30 EN Rev. 1
EL6010-Caldos17: Notes for Calibration
For zero-point calibration:
Test gas or sample component-free process gas Test Gases
For end-point calibration: Test gas or process gas having a known sample
component concentration
Measuring Ranges
with Suppressed
Zero-Point Zero-point and end-point should only be calibrated with test gases with concen-
trations in the selected measuring range.
EL6010-Magnos106: Notes for Calibration
For zero-point calibration:
Oxygen-free process gas or nitrogen (N
2
) Test Gases
For end-point calibration: Process gas with a known oxygen concentration or
dried air or test gas with concentration in the measur-
ing range
Carrier Gas
Offset Correction The influence of carrier gases is seen in the form of a displacement of the zero
point (see Section “EL6010-Magnos106: Metrological Data”, page 56).
If it is expected that, due to a particular carrier gas specified by the customer with
the order, this zero point displacement is greater than 1 % of the smallest selected
measuring range, then the gas analyzer will be calibrated in the factory with an
average process gas, and the deviation with respect to the carrier gas N
2
will be
corrected with the software function “Carrier gas offset correction”.
This correction function has the effect that the influence of the carrier gas is
minimized in the measuring operation. It is also active in the course of calibration
while the concentration of the test gases is being measured. As a result, during
zero-point and end-point calibration measured values are displayed which differ
from the “true” measured value by the amount of the offset correction value.
During calculation of the calibration however this correction function is switched
off so that the offset correction value is not taken into account in the calibration
results.