ADM-870 05/23/081
1.0 INTRODUCTION
You will find these instructions much easier to follow if you have the meter in front of you as you read through
them. You can note the various connections and press the keys, observing the displayed results as you read
through the various procedures. The operation of the meter is quite simple and straightforward, as will
become apparent after a little practice.
The AirData Multimeter performs the following essential functions. This meter measures air velocity when
used with a pitot tube, AirFoil probe, or VelGrid and automatically corrects for density variations due to local
temperature and barometric pressure. Velocity ranges are 0-29,000 fpm using a pitot tube, 0-5,000 fpm using
the AirFoil probe, and 0-2500 fpm using the VelGrid.
When used with the Series 8400 FlowHood System, this unit measures air flow and may compensate for
density and backpressure effects, allowing direct air flow readings from 0-2500 cfm. Accurate differential
pressure measurements can be obtained from 0.0001 in wc to 60.00 in wc. Absolute pressure measurements
range from 10-40 in Hg. Temperatures can be measured from -67
/ F to 250/ F, either individually, or in
conjunction with an air flow or velocity measurement.
The Model ADM-870 AirData Multimeter performs these additional functions which greatly simplify the
complex technical requirements of highly demanding test and balance projects. This model features an
automatic mode which registers repeated measurements for any capability, with sequential storage and recall
of up to 100 automatically or individually obtained measurements, with sequence tags for each value. Recall
of the sum and average of the stored sequence is available at any point, without terminating the process.
Flow and velocity measurements may be displayed in either local air density or the standard density (mass
flow) sea level equivalent.
Internal calibration and zeroing of the AirData Multimeter are fully automatic. No external adjustments are
ever needed. This instrument is extremely tolerant of overpressure, and is unaffected by position or by
ambient temperatures from 40
/ F to 140/ F.
It is recommended that the AirData Multimeter kit be returned to the factory at least every two years for
recalibration and software update. This preventive maintenance program will assure that the original accuracy
of the meter is maintained throughout the life of the meter.
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