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.
Table 3: Actual process moisture at
0
vol.% H
2
O
Default value
entered
1
(Vol.-% H
2
O)
Absolute differ‐
ence to input
value
(Vol.-% H
2
O)
Process tempera‐
ture (°C)
Additional rela‐
tive % measure‐
ment 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
Table 4: Actual process moisture at
10
Vol.-% H
2
O
Default value
entered
1
(Vol.-% H
2
O)
Absolute differ‐
ence to input
value
(Vol.-% H
2
O)
Process tempera‐
ture (°C)
Additional rela‐
tive % CO meas‐
urement error
2
0
-10
100
3.8
0
-10
200
9.3
0
-10
300
14.2
0
-10
400
22.2
5
-5
100
1.2
5
-5
200
2.9
5
-5
300
4.3
5
-5
400
6.8
15
5
100
-0.9
15
5
200
-2.2
15
5
300
-3.3
15
5
400
-5.2
20
10
100
-1.7
20
10
200
-4.1
20
10
300
-6.2
20
10
400
-9.6
1
See Section 9.4.8
2
Based on 500 ppm CO, the uncertainty is lower for higher concentrations
Table 5: Actual process moisture at 20 Vol.-% H
2
O
Default value
entered
1
(Vol.-% H
2
O)
Absolute differ‐
ence to input
value
(Vol.-% H
2
O)
Process tempera‐
ture (°C)
Additional rela‐
tive % CO meas‐
urement error
2
10
-10
100
1.8
10
-10
200
4.2
10
-10
300
7
PRODUCT DESCRIPTION
3
8008932/16YT/V4-0/2022-02 | SICK
O P E R A T I N G I N S T R U C T I O N S | GM901-02
13
Subject to change without notice
