Thermo Scientific 1300 Series Operating Manual page 10

Safety Systems
(continued)
Thermo Scientific
Safety lockout
To protect from UV radiation, the optional UV light will not turn on if
the front window is open. While the UV light is on, the front window is
closed and locked. The closed window blocks out the UV rays.
Airflow monitoring
Airflow monitoring determines the velocity of the airflow in the sample
chamber as well as the inflow velocity of air through the exhaust open-
ing. As soon as airflow velocities rise above or fall below a specified safety
value, an audible and a visual alarm is activated.
Window position monitoring
The position sensors detect the size of the front window opening and
indicate whether the window is open to the specified work position,
closed (energy saving) or in an unsafe intermediate position.
Thermo Performance Factor
The Thermo Performance Factor (PER) is a value that indicates the safe-
ty status of the cabinet. This value is calculated from data determined by
HEPA filter loading, airflow status and values captured during certifica-
tion. This data is entered into a parameter list of the control software
and interconnected. The result is indicated on the display by LEDs.
On certification by qualified personnel with a new HEPA filter, the per-
formance factor of the unit is indicated by green-green LEDs. As the
unit ages with use, the colors change. Red-red is unacceptable and the
unit should not be used. Any questions as to the safety of the unit
should be resolved before use.
Section 1
Description
1300 Series A2 1-3