Original manual – Iss. 0.1 User manual – BM 3E Freezer 31/ 44
7. OPTIONS
7.1 Remote alarm
The connector located at the rear of the unit can be used to connect a remote alarm.
We highly recommend using the NC contact, which also enables an alarm to be transmitted if one of the wires is
disconnected.
Maximum allowable current: 5 A at 30 V DC, 5 A at 250 V AC
Note: After connecting the wires, screw the connector to its base to avoid any risk of the wires being pulled loose.
7.2 CO
2
/ NO
2
backup
7.2.1 Risks and precautionary measures
Whenever a CO
2
or N
2
backup system is used, it is essential to refer to the safety data sheet (see sections 13.1 and
13.2).
7.2.2 Cold burns (cryogenic burns)
The “extreme cold” pictogram must be used to warn of this hazard.
If CO
2
or N
2
injection has been used, the door must not be opened, in order to avoid any risk of cryogenic burns.
In the event of an accident: WARNING! The temperature of the injury site must be returned to body temperature as
quickly as possible. The appearance of a cryogenic burn initially seems to be minor and does not cause concern. Rinse
the burn with warm water for at least 15 minutes.
Cover with a sterile dressing and consult a doctor.
7.2.3 Risk of asphyxiation
The “asphyxiation risk” pictogram must be used to warn of this hazard.
Cold vapours are heavier than air and can accumulate in confined locations, particularly at or below floor level.
These gases can result in asphyxiation, even from the second breath, leading to unconsciousness (oxygen content of
less than 18%).
To avoid this hazard:
- Ensure that storage and use areas are well ventilated.
- Do not discharge nitrogen into locations where it could build up to dangerous levels (sewers, basements, pits, closed
rooms).
In the event of an accident: If asphyxiation occurs, the rescuer must use a self-contained breathing apparatus to
access the victim, or must be able to quickly ventilate the room to a sufficient extent without entering it.
7.2.4 CO
2
backup
General remarks
CO
2
The pressure in the cylinders and hoses reaches 70 bar. It is therefore recommended to call on qualified
personnel for any servicing of this system.
Cylinders of liquid CO
2
must be used.
Connection
Principle: The freezer injects liquid CO
2
into the chamber if the interior temperature rises. The temperature is
regulated by the CO
2
injection solenoid valve.
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