Shortridge Instruments ADM-860C, Operating Instructions Manual

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ADM-860C 04/14/08 54
15.0 METER MAINTENANCE
The AirData Multimeter 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 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 and will assure that the original accuracy of the meter is maintained throughout the life of the meter.
16.0 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.