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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
MENU OVERVIEW AND EXPLANATIONS
7
7.2.7
Stopping time until process (O
2
)
The entry determines, on the one hand, the stopping time of the measured value memory
(when switched on) after the test gas feed (test air feed) has been completed, and, on the
other hand, the time for which the O
2
trend display should still be shown on the display
after the test gas feed (test air feed) has been completed during sensor adjustment.
7.2.8
Auto. Adjustment (ACAL)
The automatic adjustment enables a cyclic, time-controlled or remote-controlled adjust-
ment of the sensors via the digital input provided for this purpose. The automatic adjust-
ment can be globally switched on or off. It only starts from the main measured value
display.
When an ACAL 2-point is set, a test gas cylinder must be permanently connected and
turned on.
7.2.9
Settings for Auto. adjustment
The settings for automatic adjustment are only visible when automatic adjustment is
switched on globally. The adjustment method determines whether the automatic adjust-
ment should be carried out as a 1-point adjustment with test air only or as a 2-point adjust-
ment with two test gases (test air / test gas). The required concentrations of the test gases
can be entered depending on the adjustment method. Test air (ambient air) is preset with a
fixed O
2
concentration of 20.95%; this value is therefore neither displayed nor can it be
changed.
The automatic adjustment starts via:
●
Time:
Time-controlled start with fixed intervals. The interval time (in days) as well as the
time of the next execution (next ACAL) can be defined here. The entry for the next
execution also allows a date/time before the system time, but this is then automatically
corrected to the system time + interval.
●
Time + digital input:
Same as “Time”, additionally a control voltage of 12...24 V DC must
be applied to the digital input “Adjustment release” to start the automatic adjustment.
●
Digital input:
Automatic adjustment is started as soon as a control voltage of 12...24 V
DC is applied to the digital input “Adjustment release”. If the control voltage on the
digital input is maintained after adjustment, a new automatic adjustment is started
immediately.
Note:
Make sure the test air and test gas flow volumes required for adjustment are set
correctly.
For systems
with flow monitoring
: The flow volumes can be adjusted via
System check --> Sensor check can be checked and adjusted if necessary.
For systems
without flow monitoring
: Check the flow volumes using an external flow
meter and, if necessary, set to 150 - 180 l/h using an external throttle valve.
