SAFE 2010/MaxiSAFE 2010
INSTRUCTION MANUAL
Page 15 of 35
81-09-IM.doc
All tests have to be done by an authorised test technician.
The test results must be entered in a test book.
For more information about testing please consult the service manual.
7.1. Air velocity in laminar flow
Equipment:
The down flow is measured with a calibrated thermo anemometer.
Procedure:
Turn on the cabinet and wait until the airflow has been stabilised.
The thermo anemometer is placed in the measuring spot in a height 50 mm over the upper edge of
the front opening.
The measuring spots are the same at both SAFE and MaxiSAFE.
Measure in 2 rows 150 mm and 350 mm from the sucking holes in the front of the working plate,
starting 150 mm from the left side window and with 300 mm between the measuring spots.
On the left side of the working plate the measuring probe shall point left parallel to the back wall,
and on the right side of the working plate the measuring probe point right parallel to the back wall.
Each point is to be measured in at least 5 sec. and the value is to be recorded.
Calculate the mean value; record it as well as the maximum and minimum airflow.
Acceptance:
Mean downflow 0.40 m/s ± 10 %.
Distribution: All velocities between mean ± 20 % m/s.
Alarms:
The alarms for high and low downflow are set to mean ± 20 % m/s, and the matching voltage is to
be recorded.
7.2. Air velocity in inlet and exhaust opening
Equipment:
The inflow is measured with a suitable volumetric measuring device.
Procedure:
The measuring can take place directly in the opening or directly at the exhaust filter.
Cover the front opening with a plate and seal it so only an opening for the measuring device is free.
Measure the volumetric flow and calculate it into velocity in m/s, and record the result.
Formula for the calculation: X m
3
/h / (3600s/h x aperture in m
2
) = Y m/s.
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