Sensor System; Door Switch; Fig.5: Temperature Sensor; Fig.6: Door Switch - VWR symphony 5.3 A Operating Instructions Manual

Operating Instructions | symphony 5.3 A – 06/2009
4 4 4 Description of the device Description of the device Description of the device
atmosphere. The CO content of the work space
2
atmosphere can be controlled within a range of
0 - 20 %.
The CO must be of the following quality:
2
• Purity 99,5 % min.,
or
• medical grade.

4.4 Sensor system

Fig.5: The blower wheel and two sensor modules are
integrated in the baseplate [1] of the measuring cell:
• Sensor [2] for the measurement of the work space
temperature and of the thermal protection,
• CO sensor [3] for the measurement of the CO
2
content in the work space atmosphere.
The sensor for the measurement of the work space
temperature as well as the CO
control system of the device. Their measured values
are compared to the set nominal values. Based upon
this data, the control system controls heating and CO
supply.
The blower intermixes the supplied gases and ensure
uniform temperature distribution within the work
space.
The thermal protection has been preprogrammed at
the factory and cannot be changed. It protects the
stored cultures from overheating. If the temperature is
exceeded by more than 1 °C, the thermal protection
responds and the work space temperature is automa-
tically reduced to the set nominal value so that the
incubation process can be continued even in case of a
failure. Any response of the thermal protection will
simultaneously trigger an audible and visual alarm.

4.5 Door switch

Fig.6: A door switch [1] is installed in the upper edge
of the work space opening. If the door switch is activa-
ted by opening the glass door, the gas supply and the
heating of the work space are interrupted and the dis-
play 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.
2
sensor form part of the
2
2
21
A

Fig.5: Temperature sensor

1

Fig.6: Door switch