TSI Incorporated 4140, Operation And Service Manual

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9
Chapter 4
Maintenance
Flow Sensor
Periodically inspect the flow sensor by looking into the outlet of the
flowmeter. Remove dust, particles and fibers from the sensor with
clean, dry compressed air. The flow sensor will break if touched.
Never run liquids through the flowmeter and never touch the
sensor with a brush.
Dust or other deposits on the flow sensor will
degrade the 4140/4143 flowmeter
’s flow accuracy.
CAUTION
The flowmeter must be switched off for cleaning.
Only use clean, dry, compressed air when
attempting to remove contamination from the
sensor.
Re-certification
To maintain a high degree of confidence in the measurements made
by the Model 4140/4143, TSI recommends that the instrument be
returned to TSI every 12 months for re-certification. The flowmeter will
be recalibrated and returned with a certificate of calibration to US
National Institute of Standards Technology (NIST) traceable
standards.
This “annual checkup” assures you of consistently
accurate readings; it is especially important in applications where
strict calibration records must be maintained.
Cases
If the instrument case or storage case needs cleaning, wipe it off with
a soft cloth dipped in isopropyl alcohol or mild detergent.
Never
submerge the flowmeter or allow liquids to enter the flow tube.
Storage
When storing the flowmeter, always cover the ends of flow tubes with
the caps provided to prevent dust or other foreign matter from
entering the tube.