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VWR
Connecting the alarm contact
NOTICE!
Expert work:
VWR warrants the operational safety and the operativeness of the device only if installation and
repairs are performed properly.
The connection of the device to an external alarm system must only be carried out by adequately
trained and authorized expert electrical/telecommunication personnel!
Function:
When failures occur in the temperature or gas control circuits, an alarm message is issued to the
connected alarm/monitoring system. The potential-free contacts (1 changeover contact) have been
laid out for the following circuits:
Circuit
Circuits with system voltage
SELV circuits
(cf. VDE 0100, Part 410)
SELV-E circuits
(cf. VDE 0100, Part 410)
Alarm relay
Operating state
No failure, power off
No failure, power on
Failure
X: Contact closed / O: Contact open
NOTE!
Switching structure:
For all failures reported by the device (sensor circuit open, deviation from the nominal value and
door open for more than 10 minutes), the alarm relay changes state!
Voltage
max. 250 V ~
25 V ~
60 V =
50 V ~
120 V =
Contact 4 - 1
X
O
X
Start-up |
Chapter 5
External fusing
max. 6 A
max. 2 A
max. 1 A
max. 1 A
max. 0.5 A
Contact 4 - 3
O
X
O
CO2 Incubator Basic | 37
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