Eppendorf CO2 Back-up System - Manual (Page 23)

Operation
New Brunswick CO2 Back-up System
English (EN)
23
When the back-up battery's voltage drops below 11.4 volts, the Battery Low LED will illuminate and an
alarm will sound.
7.6 Alarm system monitoring socket
The CO
2
Back-up System is designed with a fixed socket at the rear labelled Alarm Socket, and a plug for
external monitoring purposes.
Within the control unit, the alarm socket is connected to volt-free, switching contacts rated at 24 volts, 1
amp. In normal operation, pin 1
(E) is connected to pin 2 (L) and in the alarm condition, pin 1 (E) is
connected to pin 3 (N).
The alarm plug can be used to connect to a remote alarm device or central monitoring system.
WARNING! Hazardous voltages
 Hazardous voltages must not be connected to the remote alarm socket. Maximum rating is
24 volts, 1 amp.
NOTICE!
 External device shall secure double reinforced insulation from mains voltage in accordance
with 61010-1
1 Freezer Socket
2 Alarm Plug (external view)
3 Alarm Plug (internal view)
1 2 3