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CROSS COMPENSATION / SETTING OF RESPSONSE TIME (TC ONLY)
ETC00781(4) Series 100 e 02/2004
14. Cross Compensation / Setting of Respsonse time (TC Option only)
14.1 Cross Compensation
For gas mixtures of two gas components (binary gas mixtures) with different thermal
conductivities the analyzer may be calibrated to directly show the concentration of one of the
gas component. The same is applicable for “quasi-binary” gas mixtures of more than two
components with only a single component (the component to be measured) of varying
concentration. The compostition of the remainder of the gas mixture remains constant in time.
For the more common case that more than one component of a sample gas mixture has varying
concentrations the result of this measuring principle is non-selective; i.e., it will not be
unambiguously related to the true concentration of the gas component of interest.
If the concentrations of interfering gas components are detected by using other gas analyzers
and the analytical signals thus obtained are supplied to the analyzer via rear panel plug
“CROSS COMP.” (Item 9 of Fig. 1-5) or “Analog In” (Item 5 of Fig. 1-7 and 1-8), then the disturbing
effects of any interfering gas component may be electronically compensated .
The analyzer is designed for compensating up to 3 interfering gas components.
Possible signal inputs are 0 (0.2)- 1 V, 0 (2)- 10 V or 0 (4) - 20 mA.
Observe the wiring hints in chapter 29.10 !
CROSS COMPENSATION
Fig. 14-1: Pin assignments “Cross. Comp:” / “Analog In”
(TC-Option analog signal inputs for interference compensation)
1 interfering gas 1
2
⊥⊥
⊥⊥
⊥ (GND) interfering gas 1
3 interfering gas 2
4
⊥⊥
⊥⊥
⊥ (GND) interfering gas 2
5 not used
6 interfering gas 3
7
⊥⊥
⊥⊥
⊥ (GND) interfering gas 3
8 not used
9 not used
9
6
5
1
9
6
51