11.3 Environmental Conditions
The biological safety cabinets are designed to be electrically
safe in the following environmental conditions:
• Indoors
• Altitude: Up to 2,000 meters
• Temperature: 5°C to 43°C
• Humidity: 80% RH at or below 31°C, decreasing linearly to
50% RH at 40°C
• Mains Supply Fluctuations: ± 10% of nominal.
• Installation Category II
1
• Pollution Degree 2
2
• Class of Equipment I
1
Installation category (overvoltage category) defines the level of transient
overvoltage which the instrument is designed to withstand safely. It depends on
the nature of the electricity supply and its overvoltage protection means. For
example, in CAT II which is the category used for instruments in installations
supplied from a supply comparable to public mains such as hospital and
research laboratories and most industrial laboratories, the expected transient
overvoltage is 2500V for a 230V supply and 1500V for a 120V supply.
2
Pollution degree describes the amount of conductive pollution present in
the operating environment. Pollution degree 2 assumes that normally only non-
conductive pollution such as dust occurs with the exception of occasional con-
ductivity caused by condensation.
Model 1280 Series ________________________________________________________________________Specifications
11 -2
