Knick Stratos Pro A401B PH, User Manual

Page: 44 / 196

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Alarm
Manual activation of HOLD
The HOLD mode can be activated manually from the HOLD menu. This
allows checking or replacing a sensor, for example, without provoking
unintended reactions at the outputs or contacts.
Press meas key to return to selection menu.
Alarm
When an error has occurred, Err xx is displayed immediately.
Only after expiry of a user-defined delay time will the alarm be
registered and entered in the logbook.
During an alarm the display blinks, the display backlighting turns red .
Error messages can also be signaled by a 22 mA output current
(see Configuration).
The alarm contact is activated by alarm and power failure, see also
“Configuration / Alarm Settings“.
2 sec after the failure event is corrected, the alarm status will be
deleted.
External activation of HOLD (SW-A005)
The HOLD mode can be activated from outside by sending a signal to
the HOLD input (e.g. from the process control system).
HOLD inactive 0...2 V AC/DC
HOLD active 10...30 V AC/DC
Process control system
Power supply
12...24 V AC/DC
Stratos Pro A4...
HOLD
input
11
12