CB (E7) 06/2018 Page 26/174
Ambient conditions
• Permissible ambient temperature range for operation: +18 °C / 64.4 °F to +30 °C / 86 °F
At elevated ambient temperature values, fluctuations in temperature and humidity may occur.
• Ideal ambient temperature: at least 7 °C / 12.6 °F below the intended working temperature. E.g.,
working temperature 37 °C / 98.6 °F = ambient temperature 30 °C / 86 °F and lower. In the event of
working temperatures of less than 7 °C / 12.6 °F above the ambient temperature, the setpoint can be
exceeded.
The ambient temperature should not be substantially higher than the indicated ambient
temperature of 22 +/-3 °C / 71.6 +/-5.4 °F to which the specified technical data relates. For
other ambient conditions, deviations from the indicated data are possible.
Avoid direct solar radiation on the chamber.
• Permissible ambient humidity: 70 % r.H. max., non-condensing.
• Installation height: max. 2000 m / 6561.7 ft above sea level.
• Wall distances: rear 100 mm / 3.94 in, sides 50 mm / 1.97 in.
To completely separate the chamber from the power supply, you must disconnect the power
plug. Install the chamber in a way that the power plug is easily accessible and can be easily
pulled in case of danger.
Notes on handling carbon dioxide (CO
2
)
Carbon dioxide (CO
2
) in high concentrations is hazardous to health. It is colorless and almost odorless
and therefore practically imperceptible. Vent out any CO
2
gas that may escape via good room ventilation
or a suitable connection to an exhaust system. We recommend installing a CO
2
warning system.
WARNING
High concentration of CO
2
(> 4 Vol.-%).
Danger of death by suffocation.
Danger of poisoning.
∅ Do NOT set up chambers in non-ventilated recesses.
Ensure technical ventilation measures.
Observe the relevant regulations for handling CO
2
.
Observe the occupational exposure limit OEL for CO
2
set by the national authorities (formerly
maximum permitted workplace concentration). Check compliance when operating all chambers located in
the room.
• OEL for Germany: 5000 ml/m
3
(ppm) = 0,5 Vol.-%
• CO
2
lost from CB 170 at 5 vol.-% CO
2
with each opening the door: about 14.8 g, i.e. 0.00758 cubic
meters / 0.268 cubic feet (under normal pressure)
• CO
2
lost during 12h at 5 vol.-% without opening the door: approx. < 2 g, i.e. 0.001 cubic meter / 0.035
cubic feet (under normal pressure 1013 mbar / 14.7 psi)
An example of how to evaluate laboratory volume and air change rate:
Question: Is an air change rate of 1/h sufficient for a lab with a volume of 100 cubic meters /
3,531.5 cubic feet with 10 incubators CB 170, opened 4 times per hour?
Calculation: CO
2
concentration = CO
2
lost by opening the door, multiplied by 10 incubators,
multiplied by opening the door 4 times per hour, divided by lab volume
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