Siemens ULTRAMAT 23 Series - Configuration: Factory Configuration; Automatically Executed Functions of the H2 S Sensors; Probe Protection and Purging Function; Probe Protection Function

8.4.4 Con󹪝guration: Factory con󹪝guration
Overview
844
Factory configur.!
Enter special code
: 0000
These are factory settings made especially for your analyzer.
Since incorrect modi󹪝cations to these parameters may perma‐
nently in󹪞uence the functions of your analyzer, access to these
functions is only possible by specially trained and authorized
servicing engineers using a special access code.
8.5 Automatically executed functions of the H2S sensors
8.5.1 Probe protection and purging function
A protection and purging function is implemented by means of software since H
2
S
concentrations above the speci󹪝ed continuous concentration impair the functionality and
service life of the H
2
S probes.
In addition, a purging function is implemented for the 50 ppm H
2
S probe in order to allow an
intermittent measurement above the permissible continuous concentration.
These functions are executed automatically when certain operating states occur.
8.5.2 Probe protection function
De󹪝nition of probe protection function
A value 1.1 times the speci󹪝ed range can be considered as the maximum continuous
concentration. Although a measurement above such a concentration is still correct, the probe
is damaged by longer exposure. The maximum continuous concentration remains constant
even when changing the measuring range.
The protection function is also implemented with the 50 vpm probe for compatibility reasons
even though its maximum continuous concentration is 12.5 vpm. The protection function is
executed above this value.
Execution of this function is the same for all probes. The function test is set during execution of
the protection function in order to signal that the displayed value is incorrect.
How the protection function works
The protection function is triggered if the continuous measured value of H
2
S is greater than the
maximum continuous concentration (110 % of full-scale value) in measuring mode for a period
of 3 seconds.
Functions
8.5 Automatically executed functions of the H2S sensors
ULTRAMAT 23
Equipment Manual, 04/2022, A5E37100388-012 157