Dräger VarioGard IR EX, Инструкция по эксплуатации, Страница: 35 / 43

Seite 35
In Case of an Alarm
General Information:
When an alarm is triggered as a result of a too high gas concentration, either
the pre alarm or the main alarm are issued. The display indicates the actual
gas concentration alternately flashing with the “pre alarm” or “main alarm”.
Transmitter Without Power Supply:
The preset value for the pre alarm or main alarm is transferred to a controller
via the interface (e.g. main alarm 18mA).
Please note that the VarioGard IR Ex switches currentless as soon as a main
alarm is triggered.
Transmitter With Power Supply:
The pre alarm and main alarm are each assigned a relay via which
countermeasures can be initiated (e.g. activation of additional ventilation).
The relays are NCs (= normally closed contacts; when no current is applied,
the contact is closed).
Please note that the VarioGard IR Ex switches currentless as soon as a main
alarm is triggered.
All alarms are non-latching alarms.