CO
2
Incubator BB 150 Operating Instructions
20
4.
Description of the device
4.7
Door switch
Fig. 7:
A door switch [1] is installed in the upper edge of the work
space opening. If the door switch is activated by opening the
glass door, the gas supply and the heating of the work space are
interrupted and the display shows will flash.
If the door remains open for more than 30 seconds, a short
acoustic alarm sounds. If the door remains open for more than
10 minutes, the acoustic alarm sounds continuously.
The outer door can only be closed after the glass door has been
latched properly.
4.8
Switchbox with supply interface
All supply connections are installed in the switchbox at the rear
of the device.
Gas connection:
Fig. 8:
The gas supply line between the device and the gas
supply system is connected using the supplied connecting
hoses. CO
2
is supplied to the device through a separate con-
necting sleeve [1].
The process gas must be supplied to the device at a fixed
pressure that has been preset within a range of 0.8-1.0 bar,
this must remain unchanged.
Before the gas is fed into the work space, it flows through a
sterile filter with a separation rate of 99.97 % for a particle size
of 0.3
μ
m (HEPA filter quality).
Label:
Fig. 8:
The label [2] contains information about gas supply, an
alarm contact terminal legend, and notes about the electrical
fusing of the device.
RS 232 interface:
Fig. 8:
Via the RS 232 interface [3], the incubator can be con-
nected to the serial interface of a PC. This connection allows
the computer-aided acquisition and documentation of the major
operating parameters (temperature, CO
2
concentration, failure
codes, etc.).
Alarm contact:
Fig. 8:
The device can be connected to an on-site, external
alarm system (e.g. telephone system, building monitoring
system, visual or acoustic alarm system). For this purpose, a
potential-free alarm contact [4] is preinstalled in the device.
Fig. 8
Supply interfaces
Fig. 7
Door switch
