48
8024252/AE00/V1-0/2020-07| SICK
O P E R A T I N G I N S T R U C T I O N S | ZIRKOR200 Ex-D
Subject to change without notice
7
MENU OVERVIEW AND EXPLANATIONS
7.2.4
O
2
limit value alarms
Fig. 27: O
2
limit value alarm settings
The entry “at” defines the O
2
value from which the O
2
limit value alarm is to be signaled.
With the O
2
limit value alarm function “min” (1), limit value alarm (3) is triggered when the
O
2
measured value falls below the defined O
2
limit value “min”.
If a hysteresis unequal to 0.00% O
2
is defined (2), the limit value alarm is reset when the O
2
measured value rises above the O
2
limit value
plus
hysteresis value (4).
With the O
2
limit value alarm function “max” (5), limit value alarm (7) is triggered when the
O
2
measured value rises above the defined O2 limit value “max”.
If a hysteresis unequal to 0.00% O
2
is defined (2), the limit value alarm is reset when the
O
2
measured value drops below the O
2
limit value
minus
hysteresis value (6). If the hystere-
sis is set to 0.00% O
2
, the O
2
limit value alarm must be reset manually on the device.
7.2.5
O
2
sensor adjustment values
A 1-point adjustment should be carried out every 4-6 weeks and a 2-point adjustment every
6 months.
With EMI, a 1-point adjustment should be carried out every 3 days and a 2-point adjust-
ment every 6 months.
7.2.6
Time per test gas feed
Defines the time per test gas feed (test air feed) during a sensor adjustment. If the sensor
stability is not reached within the preset maximum time, the adjustment is aborted with the
error message:
“O
2
sensor adjustment failed - O
2
sensor signal unstable”.
Extend the time when this error
message appears.
The maximum time set at the factory is 10 minutes. If necessary, the time can be set
between 5 and 30 minutes.
Note:
The O
2
sensor adjustment values can be changed by a 1- or 2-point adjustment. Manual
entry is only necessary after replacing the O
2
probe.
