Note
A set limit only triggers a relay contact if a relay has previously been assigned to the
corresponding limit signal (see section Conguration: Inputs/outputs/pump: Assign relays
(Page 140)). The limits are not updated:
• During the rst warm-up phase
• During an AUTOCAL
• During the message: Function control and analog output at 'Hold measured value' (see
section Conguration: Inputs/outputs/pump: Analog outputs (Page 137))
Limit 1 SO2
Lim. 1: 2000 mg/m
Alarm conc. :-----
8321
3
If you have selected "Limit 1" or "Limit 2", a menu display appears
in which you can enter the lower or upper limit for each com‐
ponent. You can dene the value in the second line, and the
condition under which a contact is be triggered in the third
(Alarm at conc.:):
• High: with upward violation
• Low: with downward violation
• - - - - -: no message
The limit value has a hysteresis of ≤ 2% of the set full-scale value.
8.3.3 Parameters: Limits: H2S sensor protection
832
Limit 1 H2S
Limit 2 H2S
Protec. sensor H2S
If 'H
2
S' is selected as the component in the higher-level menu
display, the 'H
2
S sensor protection' function is selected in addi‐
tion to the limits. The 'Limit' function is described in section Pa‐
rameters: Limits (Page 130).
8323
Protec. sensor H2S :
ON
In the 3rd line you can select the 'H
2
S sensor protection' function.
The adjacent menu display appears when you select the func‐
tion in which you can switch the 'H
2
S sensor protection' function
on and o.
Hydrogen sulde (H
2
S) is a corrosive gas, especially in wet con‐
dition and in combination with other gases. This function pre‐
vents damage occurring to the H
2
S sensor from high concentra‐
tions of H
2
S. This function is enabled by default (ON). Execution
of this function is described in section Probe protection function
(Page 157).
Functions
8.3 Parameter
ULTRAMAT 23
Equipment Manual, 04/2022, A5E37100388-012 131
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