Edition 3 April 2012 Mars/Mars Pro Service Manual
Page 46/59
Testing
After installation or change of location and before the initial start-up
According to the standard EN 12469, the following must be tested:
Check that manufacture’s specifications are met
Leakage test of the main and exhaust air filter.
Air inlet speed in the work opening.
Check air flow patterns.
Optionally a KI-Discus test for testing operator protection in situ.
All tests have to be done by authorized test technician approved by ScanLaf A/S. The test results must be
entered in a test book.
10.1 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 stabilized.
The thermo-anemometer is placed in the measuring spot in a height 75 mm (50-100) over the upper
edge of the front opening.
The measuring spots on the tabletop are for Mars 1200 GS: Min 4 in a line evenly divided 125 mm
from the back wall and 4 in another line 200 mm from the front window.
Each point is to be measured in at least 1 min and the value is to be recorded.
Calculate the mean value; record it as well as the maximum and minimum airflow.
Acceptance:
Mean downflow. 0.28 ±10% m/sec.
Distribution: All velocities between 0±10% m/sec.
The fan speed settings are to be recorded.
Alarms:
The alarms for high and low downflow are set to mean ±20% m/sec, and the matching alarm level settings are to be
recorded.
10.2 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, i.e.
Balometer, 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
3
) = Y m/s.
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