CO
2
Incubator BB 150 Operating Instructions
30
5.
Start-up
5.7
Connecting the alarm contact
NOTE – Expert work
Thermo Fisher Scientific Products 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 elec-
trical/telecommunication personnel!
Function:
When failures occur in the temperature or gas control circuits, an alarm mes-
sage is issued to the connected alarm/monitoring system. The potential-free con-
tacts (1 changeover contact) have been laid out for the following circuits:
Alarm relay
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.
Circuit
Voltage
External fusing
Circuits with system voltage
max. 250 V ~
max. 6 A
25 V ~
max. 2 A
60 V =
max. 1 A
50 V ~
max. 1 A
120 V =
max. 0.5 A
SELV circuits (cf. VDE 0100, Part
410)
SELV-E circuits (cf. VDE 0100,
Part 410)
Operating state
Contact 4 - 1
Contact 4 - 3
No failure, power off
X
O
No failure, power on
O
X
Failure
X
O
X: Contact closed / O: Contact open
