CB (E7) 06/2018
Page 19/174
2.
Chamber description
The CO
2
incubators CB are equipped with a multifunctional microprocessor display controller for
temperature, CO
2
, and O
2
(chamber with O
2
control) levels and humidity (chamber with active
humidification) and a digital display accurate to one-tenth of a degree resp. 0.1 vol.-%. With its
comprehensive program control functions, the display program controller MB2 permits the high precision
performance of temperature, CO
2
, O
2
(chamber with O
2
control), and humidity (chamber with active
humidification) cycles.
Material:
The inner chamber, the pre-heating chamber and the inside of the doors are all made of
stainless steel V2A (German material no. 1.4301, US equivalent AISI 304). The inner surfaces are
smooth and therefore easy to clean. The inner chamber is deep-drawn from one piece, polished (suitable
for pharmaceutical applications) and has no welds or inaccessible corners. The hinges and the seal of the
inner glass door are glued from the outside to aid cleaning of the inner chamber. When operating the
chamber at high temperatures (sterilization), the impact
of the oxygen in the air may cause discoloration
of the metallic surfaces (yellowish-brown or blue) by natural oxidation processes. These colorations are
harmless and will in no way impair the function or quality of the chamber. The perforated shelves are also
made of stainless steel. You can insert a maximum of 3 (CB 56), 6 (CB 170), resp. 8 (CB 220) shelves.
The housing is RAL 7035 powder-coated. All corners and edges are also completely coated.
Door lock:
The DuoDoor™ door lock offers two to open the outer door and glass door independently or
together. The outer door is regularly equipped with a door lock with keys.
Sterilization:
The chamber’s heating system permits hot-air auto-sterilization at a setpoint of 187.5 °C /
369.5°F.
Thus, a temperature of 180 °C /
356°F
is maintained for at least 30 minutes on all internal
surfaces, resulting in sterilization of the entire inner chamber. Therefore, this procedure meets all
international guidelines regarding hot air sterilization, e.g. AAMI ST63, DIN 58947, European
Pharmacopoeia.
Temperature safety device
Thanks to the regular safety controller (temperature safety device class 3.1
acc. to DIN 12880:2007), the set temperature is maintained in case of failure.
CO
2
system:
A highly precise, drift-free CO
2
infrared measuring system in combination with the
permanent mixture of CO
2
gas through a special proprietary gas mixing head developed by BINDER
allows precise and constant CO
2
concentrations for long periods. This creates optimum growth conditions
for cultures. The gas enters the chamber via a fine filter (aseptic filter) with a high filtration efficiency that
also filters the smallest particles.
Fast reaction times, maximum accuracy and selectivity characterize the CO
2
measuring procedure of the
CB incubator series. The accuracy of the CO
2
measuring system is based on an infrared measuring cell
with NDIR (non-dispersive infrared) sensor, which continuously regulates to a reference value. Therefore,
disturbance variables and aging phenomena in the measuring system are almost completely eliminated,
so that this measuring system, in contrast to other measuring procedures, remains practically drift-free
between calibrations and is entirely selective for CO
2
. The sensor is built into the chamber and can be
sterilized.
The accuracy of the indicated values of CO
2
depends on the ambient air pressure (approx. 0.08 vol.-%
per 10 mbar /
0.15 psi
). To compensate for this effect in the CO
2
measurement, the altitude of the
installation site is entered into the controller.
O
2
control (chamber with O
2
control):
The CO
2
incubator is available with O
2
control in addition to CO
2
control. There are two different control ranges:
•
Regular equipment: Hypoxic control range
0.2 to 20 vol. % O
2
. Only N
2
can be connected to reduce
O
2
concentration; it is not possible to connect O
2
gas bottles to increase O
2
concentration. Control in
the low O
2
range is very precise, in particular in the range below 1 vol. % O
2
.
•
Alternative control range
10 to 95 vol. % O
2
(option). Although the high control range is intended in
particular for hyperoxic applications (> 21 vol. % O
2
), it is also suitable for slightly hypoxic applications
between 10 and 20 vol. % O
2
.
The O
2
sensor is a semiconductor gas sensor with ZrO
2
ceramic.
Summary of Contents for CB 170
Page 165: ...CB E7 06 2018 Page 165 174 25 9 Dimensions CB 170 Dimensions in mm...
Page 167: ...CB E7 06 2018 Page 167 174...
Page 168: ...CB E7 06 2018 Page 168 174 27 Product registration...
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