Cryotherm BIOSAFE 120, Operating Manual

Page: 18 / 65

Level Control Unit and Vessel
Control System
BIOSAFE-CONTROL® ß
14
Languages
•
The device display readings and the PC software can
be set to
German
or
English
. Combinations are pos-
sible, too, i. e. German display and English PC soft-
ware or German PC software and English display.
Level control
•
The level of the liquid nitrogen inside the storage ves-
sel is kept between minimum and maximum.
•
If the level falls below minimum, a solenoid valve is
triggered and liquid nitrogen continues flowing into the
storage vessel.
•
A delayed reaction between 0 and 999 minutes can
be selected for the magnetic valve
(1)
. This delay
cannot be set for “Filling after Min. Alarm” and “Manu-
al Filling”.
•
The filling procedure is stopped as soon as the level
reaches the maximum level.
•
If the level falls below the minimum alarm level or
exceeds the maximum alarm level, a visual and
acoustic alarm is triggered. In addition, an alarm out-
put is connected..
•
The level and the operating states are displayed both
at the device and at the PC.
•
Delay times for triggering an alarm can be set both at
the device and via PC.
•
All alarms can only be activated or deactivated via a
service menu in the PC software
(1)
. This menu can
only be accessed by service personnel. At the time of
delivery ex works all alarms are activated.
•
With opened cover, automatic refilling is suppressed.
Manual refilling (e. g. for unfogging) is possible.
•
The distances between the sensors of the level probe
(standard design) are as follows:
Minimum alarm to minimum: 3 cm
Minimum to maximum: 4 cm
Maximum to maximum alarm: 3 cm
•
Alternatively there is a level control probe spaced at
2 cm/2cm/2cm. If required, please contact the
manufacturer or service.
•
In order to set the requested level in the storage ves-
sel, the vessel probe has to be inserted more or less
deeply into the instrument leads provided for this.
4 Level Control Unit and Vessel
Control System
BIOSAFE-CONTROL
®
ß
4.1 Functions