Forma Scientific, Inc.________________________________________Routine Maintenance
8-1
Section 8 - Routine Maintenance
8.1 Checking the Static Pressure Gauge "Zero"
Note: In order to provide an accurate reading, the indicating needle of the static
pressure gauge should be precisely at zero when the cabinet is shut off. If the cabinet is
connected to a central exhaust system, the exhaust system must also be shut off.
Following HEPA filter replacement, the static pressure gauge should be checked for
zero when the cabinet is shut off. When the cabinet is started up and proper air flow balance
has been reached, the reading on the gauge should be recorded. This initial reading will
serve as a base line indication of subsequent filter loading. When the reading increases by
approximately 50% , the air flow balance should again be checked. Replacement of the
filters may be required. Refer to section 8.2.
8.2 Zeroing the Static Pressure Gauge
• Turn the cabinet off.
• Remove the front cover from the static pressure gauge by grasping the front cover and
turning it counter-clockwise.
• Locate the Allen-type adjustment screw beside the gauge needle.
• Turn the adjustment screw counter-clockwise to lower the reading; clockwise to raise it.
8.3 Adjusting the Damper
Since the HEPA filter resistance may vary from filter to filter (even filters of the
same size), a damper has been installed in the cabinet exhaust system for maintaining proper
airflow balance. The purpose of the damper is to regulate the amount of exhaust air, intake
velocity and supply velocity. The damper has been preset at the factory and should not be
readjusted unless the proper velocities cannot be obtained.
Adjustments must be made only by qualified personnel!
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