ADM-870 05/23/082
2.0 SPECIFICATIONS
AIR VELOCITY: Measured in feet per minute (fpm), or meters per second (m/s), corrected for local or
standard air density. The measurement range is 25 to 29,000 fpm with a pitot tube, and 25 to 5,000 fpm with
the Shortridge Instruments, Inc. AirFoil probe. The measurement range using the VelGrid is 25 to 2500 fpm.
Accuracy is ± 3% of reading ± 7 fpm from 50 to 8000 fpm. Pitot tube velocity readings from 8,000 fpm to
29,000 fpm are based on compressible isentropic flow theory and are not certified NIST traceable.
DIFFERENTIAL PRESSURE: Measured in inches of water column (in wc) or Pascals (Pa). The
measurement range is from 0.0001 to 60.00 in wc. Maximum safe pressures are 20 psid (900% full scale)
and 60 psia common mode. Accuracy is ± 2% of reading ± 0.001 in wc from 0.0500 to 50.00 in wc.
ABSOLUTE PRESSURE: Measured in inches of mercury (in Hg) or bars with reference to a vacuum. The
measurement range is 10-40 in Hg. Maximum safe pressure is 60 psia. Accuracy is ± 2% of reading ±
0.1 in Hg from 14 to 40 in Hg.
TEMPERATURE: Accuracy is ± 0.5
/ F from 32/ F to 158/ F with a resolution of 0.1/ F using the ADT442,
ADT443, ADT444, ADT445 or ADT446 TemProbes. Meter will display readings from -67.0
/ F to 250.0/
F. Safe exposure range for TemProbe is -100/ F to 250/ F. Do not expose the plastic base of the
TemProbe or the extension wand to temperatures above 200
/ F.
AIR FLOW: Measured in cubic feet per minute (cfm) or litres per second (L/s), corrected for air density. This
function requires the use of the Shortridge Instruments' Series 8400 Backpressure Compensating
FlowHood System. The measurement range is 25 to 2500 cfm supply and 25 to 1500 cfm exhaust.
Accuracy is ± 3% of reading ± 7 cfm from 100 to 2000 cfm (nonbackpressure compensated readings).
AIR DENSITY CORRECTION: The air density correction range is 14-40 in Hg and 32
/ F to 158/ F for
correction of air flow and velocity measurements. The readings represent either local density air flow or
standard density sea level equivalent (mass flow) for air flow or velocity. Readings are corrected for the
density effects of temperature and absolute pressure.
MEMORY: 100 readings with sequential recall of each reading with average and sum.
RESPONSE TIME: Five seconds or less at pressures greater than .002 in wc (180 fpm), and up to eight
seconds at less than .0003 in wc (70 fpm). SPEED-READ mode provides continuous readings in as little
as two second intervals. (Accuracy specifications do not apply).
READOUT: Eight digit, 0.5 inch, liquid crystal display (LCD).
METER HOUSING: High impact, molded, "T" grade ABS.
WEIGHT: 36 ounces, (1.02 kg) including batteries.
SIZE: 6.0" x 6.4" x 2.7" (15.2 x 16.3 x 6.9 cm).
BATTERY LIFE: Normally two working days of heavy use, or 2000 readings per charge. A set of
rechargeable type AA NiCad batteries is supplied in each meter. Batteries may be recharged up to 500
times before replacement. If rechargeable batteries are not available in a field situation, the batteries may
be replaced with 12 non-rechargeable "AA" pen cell batteries. WARNING: Do not plug the charger in
if any non-rechargeable batteries are in the meter. The meter may be seriously damaged along with the
batteries and charger.
BATTERY CHARGER: The battery charger requires 120V, 60Hz, 6W. Batteries recharge in a maximum of
10 hours, and may be left on charge for an unlimited time without harm. The temperature of the
instrument during charge should be kept between 40
/ F and 113/ F (5/ C to 45/ C). The meter is fully
operational during recharge.
OPERATIONAL TEMPERATURE LIMITS: The specified accuracy for measurements is maintained over a
meter exposure temperature range of 40
/ F to 140/ F (5/ C to 60/ C).
STORAGE TEMPERATURE LIMITS: -4
/ F to 140/ F (-20/ C to 60/ C).
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