Forma Scientific, Inc.__________________________________________________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 airflow balance has been
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 airflow balance should again be checked. Replacement of the filters may be required.
Refer to Section 8.2, Re-zeroing the Static Pressure Gauge.
8.2 Re-Zeroing the Static Pressure Gauge
1. Turn the cabinet off.
2. Remove the front cover from the static pressure gauge by grasping the front cover and
turning it counterclockwise.
3. Locate the Allen-type adjustment screw beside the gauge needle.
4. Turn the adjustment screw counterclockwise 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.
CAUTION! Adjustments must be made only by qualified personnel!
Contains Parts and Assemblies
Susceptible to Damage by
Electrostatic Discharge (ESD)
CAUTION
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