NOTICE
The zero adjust must be carried out in a CO-free environment
b
The zero adjust can be carried out directly at the sampling point when the plant is
switched off.
b
The zero adjust must be carried out outside the duct when the plant is in opera‐
tion.
NOTE
When using the GPP measuring probe
b
Purge the measuring probe with N
2
.
b
Allow sufficient time to clean the measuring probe.
b
At least 20-60 mbar above process pressure
NOTE
The warming up phase for the measuring system takes 30 minutes. The measuring
system is first stable after this period.
Prerequisites
b
Ensure the optical alignment has been carried out on the measuring probe. Cor‐
rect if necessary.
Performing zero adjust
1.
Press "cal".
2.
Menu navigation for zero adjust (select zero adjust),
.
The zero point adjustment is running while "Zero Measuring" is shown in the
control unit display.
3.
When zero adjust has completed:
–
Refit the GMP measuring probe with the measuring device on the flange,
resp.
–
Terminate the N
2
purge process (GPP measuring probe).
7.11.1
Manual SPAN test (optional)
Manual SPAN test (optional) for linearity control
NOTE
This test requires the optionally available CO cell and holder,
.
7.11.1.1
Determining the test values
The test concentration, this means the value of the test cell, is determined with the
following formula:
TW [ppm
×
m] = MB [ppm]
×
x
×
S [m]
TW =
Test value
MB =
Upper measuring range value
S =
Measuring path
x =
Test point location
COMMISSIONING
7
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
41
Subject to change without notice
