TSI Incorporated Alnor LoFlo Balometer Mode D'emploi page 12

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Hoods
Hoods may be cleaned in cool water with a mild
detergent.
Sensing Manifold
The manifold should be checked visually before using
to be certain that the sensing holes have not become
clogged with dirt or dust particles. Do not immerse the
manifold in water. It is recommended that cleaning be
done with extreme care with the manifold in place. Do
not use highly compressed air to clean the manifold
tubes.
Calibration
It is recommended that your LoFlo Balometer be
returned to the factory once a year for a calibration
check. When shipping the LoFlo Balometer for factory
calibration, pack it carefully, and follow the
Instructions for Return in this manual.
Vent Operation
If the vent becomes difficult to operate, remove both
thumbscrews from the vent mechanism and spray the
contacting surfaces with silicone spray lubricant. Wipe
off excess and reassemble vent mechanism.
10
SECTION 9
Maintenance
Performance Check
If the calibration is to be checked, the best way is to use
a reference flow standard more accurate than the LoFlo
Balometer. Flow standards that may be used for this
purpose include orifice plates, venturis, nozzles, and
laminar flow elements. These devices require accurate
differential pressure, barometric pressure, and
temperature reading instruments to measure either
actual or standard volume rate.
If the LoFlo Balometer is checked against a velocity
instrument such as a pitot probe/manometer or thermo-
anemometer, there may be errors. If a velocity standard
is used, the average velocity must be obtained by taking
a traverse.* The accuracy of the traverse is dependent
on the flow uniformity, the number of readings taken,
the accuracy of the velocity instrument, and operator
expertise. This average velocity reading must then be
multiplied by the area over which the traverse was
taken.
Finally, air flow instrumentation is dependent on
environmental conditions such as temperature,
atmospheric pressure, humidity, and even turbulence.
These conditions can have very different effects on
various instrument types. Caution must be exercised
when making comparisons.
*A traverse is a set of velocity readings taken in a prescribed
pattern which will provide an overall velocity value when
averaged together. Any of the Alnor velocity measuring
instruments can be used for this purpose.

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