Loading ...
Loading ...
Loading ...
MK LIT (E5) 01/2021 page 44/172
The CO
2
fire suppression device can be triggered in four different ways:
• Automatically via the alarm system (notification level 2) by gas detection. At least one programmed
alarm threshold 2 threshold value for O
2
/ H
2
/ CO has been exceeded. To this end, the main switch for
gas detection must be activated (ON position). (chap. 7.8)
• Automatically via the alarm system (notification level 2) by rod controller temperature monitoring. The
temperature of 120°C has been exceeded. (chap. 13.1)
• Mechanically by pressing the manual release
In these three cases, an alarm is output via the indicator light (flashing red) and buzzer
• Manually, directly on the valve after pin pulled
This operation does NOT activate the alarm via the indicator light and buzzer.
7.9.1 Automatic triggering of the CO
2
fire suppression device
When the main switch of the gas detection system is switched on, the CO
2
fire suppression device is auto-
matically
activated when the alarm threshold 2 is reached
.
In that case, the concentration of the monitored
parameters (temperature, O
2
, H
2
, CO) has, in at least one case, exceeded the threshold value for notifica-
tion level 2, indicating a defect on a battery with outgassing.
Activation of the CO
2
fire suppression device includes CO
2
flushing with cooling effect.
When triggered, the entire content of the CO
2
pressurized gas cylinder is introduced into the interior of the
battery test chamber via a stainless steel pipe and nozzle. The resulting overpressure is discharged through
the pressure relief flap and the connection to customer-provided exhaust air. The oxygen concentration in
the working space is thereby reduced so that a fire can be stabilized or suppressed.
The triggering of alarm threshold 2 with activation of the CO
2
fire suppression device can be used by
forwarding to the customer’s systems (chap. 13.1.1) to switch off the power supply to the batteries, the
heating system, and for report-forwarding to a control station.
When alarm threshold 2 is triggered, the indicator light flashes red and the buzzer sounds.
7.9.2 After triggering of the CO
2
fire suppression device
Please observe the correct procedure when/after triggering of the CO
2
fire suppression
device (chap. 14).
If the CO
2
fire suppression device has been triggered, whether automatically by gas detection or tempera-
ture monitoring, or manually, a check must be carried out in each case to determine, depending on the fire
or chamber damage, whether the chamber can still be used afterwards. For further use, the three gas
sensors must be checked and calibrated. In addition, the CO
2
pressurized gas cylinder must be replaced.
Both must be carried out by trained specialists and are the responsibility of the operator.
A reset is carried out by switching the mains switch of the gas detection system off and on again.
7.10 Mechanical door lock
There are two door tensioners on the locking side of
the chamber. These are used to prevent uncontrolled
swinging of the doors during pressure reduction in the
event of an error.
On two-door chamber, the door tensioners are lo-
cated between the doors, and on single-door cham-
ber, on the side of the chamber.
Figure 13: Mechanical door lock
Loading ...
Loading ...
Loading ...