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(2) Method for span calibration by check gas
The method for span calibration by use of check gas (give in 2) is explained. Since span calibration has
an error of calibration curve, preset a calibration indication on the calibration curve graph attached to
this analyzer for indirect calibration.
1) The following calibration curve graph is attached to the test results for the product.
In graph, the calibration curve by the scale gas (that is similar to plant gas and determines scales of
this analyzer) and the calibration curve by the check gas that is adjusted by the scale gas (gas of
simple composition of N
1.0V
0.9
0.89V
0.8
0.7
0.6
Output
0.5
0.4
0.3
0.2
0.1
0
0
2) When using 0.95% CO
on X-axis should be stretched to upward, draw a line toward Y-axis from the cross point with the
check gas calibration curve. From the cross point with calibration curve on the scale gas composi-
tion, 0.89% or equivalent values can be obtained.
3) Set this point (0.89%) to the span calibration concentration of the calibration concentration set
value.
4) Supply 0.95% check gas to perform span calibration. It is calibrated to 0.89%.
Measurement suited to actual plants can be performed by this error correction of calibration curve.
INZ-TN2ZSVS-E
balance gas to facilitate the analyzer check) are drawn.
2
0.1
0.2
0.3
0.4
Measu red gas con centration
Calibration cu rve graph attached to the analy zer
and remainder N
2
0.5
0.6
0.7
0.8
0.89% CO
2
(check gas) as calibration gas, in graph, a point of 0.95%
2
- 77 -
Calibration cu rve by scale gas
(composition of pla nt gases)
Calibration cu rve by check
gas (N
balan ce gas)
2
* When supplying check
gases to instrume nts
adjus ted by the scale gas
composition.
0.9
1% CO
2
0.95% CO
2
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