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8008250/1F7Y/V4-0/2022-06 | SICK
O P E R A T I N G I N S T R U C T I O N S | GM901
Subject to change without notice
3
PRODUCT DESCRIPTION
3
Product description
3.1
Product identification
3.2
Product features
The in-situ gas analyzer GM901 serves for continuous measurement of gas concentrations
in industrial plants.
●
The GM901-02 is an in-situ measuring system which means measuring is done directly
in the gas carrying duct.
●
Measuring components: CO and reference value temperature.
●
Measuring principle: Infrared spectroscopic gas filter correlation.
3.2.1
Cross-sensitivities
Accurate temperature input is a critical factor that may be required to maintain desired
measurement accuracies. The temperature of an external RTD temperature sensor should
be connected to the analog input of the control unit.
The influence of temperature can be assessed in the following Table.
The humidity in the process affects measurement accuracy. GM901 does not measure
humidity, but a static humidity default value can be set.
The influence of the humidity on measurement accuracy depends on the process
temperature, the absolute process humidity and the humidity input error. The effect can be
assessed in the following Tables..
Product name
GM901
Device version
Cross-Duct
Manufacturer
SICK AG
Erwin-Sick-Str. 1 · D-79183 Waldkirch · Germany
Type plates
●
Sender unit: On the side
●
Receiver unit: On the side
●
Control unit: At the rear
Process temperature
Absolute temperature
error
Relative temperature
error
Additional relative %
measurement error
100 °C
5 °C
5%
3%
200 °C
10 °C
5%
4.8%
300 °C
15 °C
5%
6%
400 °C
20 °C
5%
6.8%
Table 2: Actual process moisture at 0 vol. % H
2
O
Default value
[1]
entered
(vol. % H
2
O)
Absolute difference to
input value
(vol. % H
2
O)
Process temperature
(°C)
Additional relative % CO
measurement error
[2]
5
5
100
-2.5
5
5
200
-6.1
5
5
300
-7.6
5
5
400
-13.9
[1] See Section 9.4.8
[2] Based on 500 ppm CO, the uncertainty is lower for higher concentrations
