6
Testing / Commissioning
A test certificate will be supplied for conformity to CE marking, and electrical test.
The airflow should be checked using a vane anemometer and the results recorded.
The main ULPA (U15) filter will have been factory tested before delivery. A DOP filter
challenge test should be carried out to verify filter integrity when the cabinet is
installed.
THE CABINET SHOULD BE TESTED EVERY 12 MONTHS.
Control System
The cabinet is controlled and monitored by a microprocessor with an LCD touch
screen. The touch screen provides the operator with general information about the
cabinet and displays the current laminar velocity and differential pressure across the
ULPA filter. Control of light level, fan speed and other operating settings are all
accessed via a menu system. The control system is factory set to maintain the
following parameters:
Normal airflow velocity:
0.40m/sec.
Low airflow alarm:
0.30m/sec.
These settings can be changed by Monmouth service personnel. Please contact
Monmouth Scientific for further advice.
Laminar Airflow
The microprocessor controls the fan speed to compensate for filter blockage.
The airflow velocity is continuously monitored and displayed. The value will
fluctuate slightly during normal operation, this is normal and is an indication
that the fan is under microprocessor control. If preferred the units displayed
can be changed to ft/min. in the Supervisor Settings.
Filter Pressure
The cabinet is fitted with a pressure sensor which monitors the pressure drop
across the main ULPA filter. Over time, as the filter becomes blocked the
pressure will slowly increase. When the pressure reaches the recommended
maximum (250pa) a warning will be displayed. The filter is protected by a pre-
filter and should last several years if properly maintained and the cabinet is
deployed within a clean area.
Summary of Contents for Circulaire HLFT1000
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