CFM-88L 07/20/0927
14.0 METER MAINTENANCE
The AirData FlowMeter is a precision instrument designed for long term field use if given reasonable care and maintenance.
The meter and FlowHood should be kept reasonably clean, and should be stored in the protective case when not in use.
The meter case and internal components are rugged, and well able to withstand normal handling. Continued rough handling
will eventually cause damage.
The meter case is water resistant, but is not waterproof. Do not use the meter in conditions where liquids or corrosive gases
might enter the case or pneumatic inlets.
Do not use or store the meter in temperatures outside the specified ranges. The meter may seem to tolerate summertime
storage in such places as the trunk of a vehicle, but battery life and other functions will eventually deteriorate.
CAUTION: When replacing the batteries, be very careful to insert each cell in its indicated position for polarity. The polarity
position marking for each cell is embossed in the housing beneath each cell position. Take note that the cells are not all
oriented in the same way. Failure to observe proper cell positioning can result in severe damage to the meter.
Battery life will be prolonged if the batteries are periodically permitted to discharge until the display registers LOCHARGE
or RECHARGE. The battery charger cord should be coiled in gentle loops rather than wound tightly around the body of the
charger transformer. This will greatly extend the life of the charger cord.
If rechargeable batteries are not available in a field situation, the batteries may be replaced with 12 nonrechargeable, alkaline
"AA" pen cell batteries. WARNING: Do not plug the charger in if any nonrechargeable batteries are in the meter. The meter
may be seriously damaged along with the batteries and charger.
Any attempt to service or repair anything inside the meter will void the Warranty and may cause serious damage to the
sensitive electronic components.
The AirData FlowMeter should be returned to the factory at least every two years for recalibration, maintenance, and software
update. This will keep the meter up to date with ongoing improvements and new features as they develop and will assure
that the original accuracy of the meter is maintained throughout the life of the meter.
15.0 FLOWHOOD MAINTENANCE
The flow sensing grid in the FlowHood unit is high impact ABS plastic. It can be damaged if subjected to physical abuse or
excessive stress. Accurate air flow measurements are dependent on the integrity of this grid. Even a hairline crack will effect
the results. The grid should not be exposed to temperatures in excess of 140
/F for extended periods, or 160/F for five
minutes. Do not lay anything on the grid or interfere with the tension of the support springs.
Check the flow sensing grid periodically for damage, poor connections to the meter, or an accumulation of dirt or dust
particles. The grid may be cleaned by wiping carefully with alcohol. Care must be taken to avoid knocking dirt or dust
particles into the grid orifices.
The top support assembly, consisting of the aluminum rod structure that supports the cloth skirt and frame assembly, should
be stored folded with the ends of each pair of legs inserted into the top and middle holes of the two front base corner tubes.
The head of the assembly should be toward the back of the base assembly. The four spring rods should be positioned
downward to avoid applying pressure to the flow sensing grid.
The fabric tops should be washed periodically in cool water with a mild detergent. The tops must be air dried only as heat
may cause the fabric to shrink. Excessive dirt build up should be avoided. Reasonable care will prolong the life of the fabric
tops. Sharp objects or corners can puncture the fabric and affect the accuracy of the readings.
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