Hach-Lange SI794 C User Manual - Manual (Page 27)

27
Alarm
The alarm delay is configurable.
During an error message the alarm LED blinks or lights.
Error messages can also be signaled by a 22 mA output current.
The alarm contact is activated by alarm or power failure, see also
Pg 54.
External activation of HOLD mode
The Hold mode can be activated from outside by sending a signal
to the Hold input (e.g. from the process control system).
Hold active Hold inactive
10 ... 30 V AC/DC 0 ... 2 V AC/DC
6
7
Hold
input
Process control system
Power supply
12...24 V AC/DC
si794
The alarm LED on the front panel can be configured as follows
HOLD off: Alarm: LED blinks
HOLD on: Alarm: LED on. HOLD: LED blinks