Measuring The Uv Tube Intensity - VWR peqlab PCR Workstation Pro Instruction Manual

Instruction Manual PCR Workstation Pro

Measuring the UV tube intensity

As UV tubes age, the intensity and germicidal destruction rate decreases. We recommend to
change the UV tubes after 1000 – 1500 hours of operation (please refer to "Checking the operating
hours of the surface tubes/UV Air Recirculator tube", page 14/15). Otherwise it is important to
monitor the efficiency of the tubes to ensure the germicidal requirements are met. The germicidal
destruction rate is a function of the UV intensity at wavelength 254 nm and exposure time. The
lower the tube intensity, the longer the lamps must be on to accomplish the same objective.
An UV Intensity Meter with 254 nm sensor will allow the user to measure the 254 nm emissions
from the tubes. When it is time to measure the UV intensity inside the PCR Workstation Pro, the
sensors can be placed on the floor of the PCR Workstation Pro. Close the front panel and turn on
the UV tubes. Please refer to the manual of your UV radiometer on how to perform the measure-
ment. It is recommended that the user records an initial value upon receipt and assembly of the
PCR Workstation Pro.
To measure the UV intensity from the UV Air Recirculator tube, open the cover lid on the back side
of the PCR Workstation Pro and perform the measurement as described on the manual of the UV
radiometer. Wear protective eyewear and shielding when operating the UV Air Recirculator with
the ventilation cover open. Replace the cover and screws after the measurement is completed.
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