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5.
System Description
5.3
Sensors
The fan wheel and two sensor modules are installed
in the base plate [2] of the metering cell:
•
Sensor module [1] measures the sample chamber
temperature and provides overtemperature pro-
tection;
•
CO
sensor module [3] measures the CO
2
of the sample chamber atmosphere.
The sensor to measure the sample chamber tempe-
rature and the CO
sensor form part of the unit's re-
2
gulatory system. The measured values they provide
are compared with the defined setpoints. Based on
this data, the regulatory system controls the heater
and the CO
supply.
2
The overtemperature protection has been preset at
the factory. It protects the cultures against excess
temperature. If the selected setpoint temperature is
exceeded by more than 1 °C, the overtemperature
protector is activated and the sample chamber tempe-
rature is automatically returned to the defined set-
point. Therefore, incubation can continue even in the
case of a fault.
Activation of the overtemperature protector simultane-
ously generates an optical alarm.
5.4
Door Interlock Switch
An interlock switch is installed in the upper edge of the
sample chamber opening. If the interlock [1] is acti-
vated by the opening of the glass door, the gas supply
and heater in the sample chamber are interrupted. A
corresponding indication appears on the control panel.
If the door remains open longer than 30 seconds, a
short audible alarm sounds. If the door remains open
longer than 10 minutes, this signal becomes conti-
nuous.
The exterior door can only be closed if the glass door
is locked.
NOTE – 6-port gas diaphragm models:
On units equipped with the optional 6-port gas dia-
phragm, the door interlock function described above
occurs as soon as the exterior door is opened.
Figure 7 / 8
Fig. 7, Metering cell sensors
content
2
Fig. 8, Door interlock switch
- 22 -
®
HERAcell
240 CO
Incubator Operating Instructions
2
Version: 03.2001 / 50065640
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