Part Two
62
NOTE:
Insert number of flow calibration you are performing.
A low flow calibration
must
be performed before its associated high flow
calibration is performed. For example, in a laboratory that has two separate
supply flows
, SP1 LOW CAL
must be completed before
SP1 HIGH CAL.
SP2 LOW CAL
must be completed before
SP2 HIGH CAL
.
It is acceptable to complete all low flow calibrations before completing their
associated high flow calibrations. To continue with the previous example:
SP1 LOW CAL
and
SP2 LOW CAL
could both be completed before
completing
SP1 HIGH CAL
and
SP2 HIGH CAL
.
Fume hood face velocity calibration must be completed before beginning
fume hood flow calibration.
Maintenance and Repair Parts
The Model 8682 S
URE
F
LOW
Room Pressure Controller requires minimal maintenance. Periodic
inspection of system components as well as an occasional pressure sensor cleaning are all that are
needed to insure that the Model 8682 is operating properly.
System Component Inspection
It is recommended that the pressure sensor be periodically inspected for accumulation of
contaminants. The frequency of these inspections is dependent upon the quality of the air being
drawn across the sensor. Quite simply, if the air is dirty, the sensors will require more frequent
inspection and cleaning.
Visually inspect the pressure sensor by sliding open the sensor housing door (Figure 9). The air
flow orifice should be free of obstructions. The small ceramic coated sensors protruding from the
orifice wall should be white and free of accumulated debris.
Figure 9: Pressure Sensor Door Slid Open
Periodically inspect the other system components for proper performance and physical signs of
excessive wear.
Pressure Sensor Cleaning
Accumulations of dust or dirt can be removed with a dry soft-bristled brush (such as an artist's
brush). If necessary, water, alcohol, acetone, or trichlorethane may be used as a solvent to remove
other contaminants.
