65
8024250/18HT/V2-0/2020-12| SICK
O P E R A T I N G I N S T R U C T I O N S | ZIRKOR200 Ex-G
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
adjustment of the sensors via the digital input provided for this purpose. The automatic
adjustment 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
adjustment should be carried out as a 1-point adjustment with test air only or as a 2-point
adjustment 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”. A new automatic adjustment is
started immediately when the control voltage on the digital input is maintained after
adjustment.
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 checked via System check --
> Sensor check 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.
