TSI Instruments SUREFLOW 8635-M, Operation And Service Manual

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28 Part Two
Maintenance and Repair Parts
The Model 8635 SureFlow Room Pressure Monitor 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 8635 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 7).
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 7: 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.
Use extreme care when cleaning the velocity sensors. The ceramic sensor may break if
excessive pressure is applied, if sensor is scraped to remove contaminants, or if the
cleaning apparatus abruptly impacts the sensor.
WARNING: If you are using a liquid to clean the sensor, turn off power to the Model
8635.
Do not use compressed air to clean the velocity sensors.
Do not attempt to scrape contaminants from the velocity sensors. The
velocity sensors are quite durable; however, scraping may cause
mechanical damage and possibly break the sensor. Mechanical damage
due to scraping voids the pressure sensor warranty.