12 GM32 · Technical information · 8011923 · V 1.4 · © SICK AG
Product Description (Details)
Subject to change without notice
2.3 Zero adjust (description)
Zero adjust basically fulfills two tasks:
● Adjustment of the device in the measuring path
● Determination of reference values for check cycles
● Zero adjust is started manually (
p. 66, §5.1)
2.4 Reference cycle (description)
The reference cycle serves to compensate changes in lamp intensity (e.g. through aging)
and contamination effects in the SR-unit.
The measured concentration values are retained (e.g. on analog outputs) during the refer-
ence cycle.
The reference cycle interval is adjustable (
p. 34, §4.2.3.1).
2.4.1 Reference cycle sequence
1 Determining the spectrometer offset
2 Setting the lamp parameters
3 Determining the aperture signal (dark signal)
4 Determining the reference spectrum
5 Determining the 4Q offset
2.5 Check cycle (description)
The check cycle serves to check the zero and reference point for each component without
using test gases.
The check cycle meets the requirements of EN14181 and obviates “drift monitoring with
test gases” according to QAL3.
The check cycle interval is adjustable (
p. 34, §4.2.3.1).
2.5.1 Control elements
Control elements that can be swiveled in are used for measuring during the check:
● 2 grating filters:
– Grating filter 1: Finely woven grating with 51% transmission and 0.3 absorption
– Grating filter 2: Finely woven grating with 6.3% transmission and 1.2 absorption
● NO cell:
–Active length 5 mm
– Filling 20% NO in N
2
–Single beam path
Relative to the double beam path used in measuring operation, this gives a C x L of
approx. 500 ppm x m or 600 mg/m³ x m
● 1 zero point reflector
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