ADM-870 05/23/0842
15.0 METER & FLOWHOOD MAINTENANCE
15.1 METER MAINTENANCE
The AirData Multimeter is a precision instrument designed for long term field use if given reasonable care and
maintenance. The meter and accessories 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.
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.
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.
If rechargeable batteries are not available in a field situation, the batteries may be replaced with 12 non-
rechargeable, alkaline "AA" pen cell batteries. WARNING: Do not plug the charger in if any non-rechargeable
batteries are in the meter. The meter will 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 Multimeter 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. This preventive maintenance program will assure that the original accuracy of the
meter is maintained throughout the life of the meter.
15.2 FLOWHOOD MAINTENANCE
The flow sensing grid in the FlowHood unit is constructed of 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
as heat may cause the fabric to shrink. Excessive dirt build up should be avoided. The tops must be air dried
only, as heat may cause the fabric to shrink. 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.
To Next Page
Loading...
