Digi-Sense 20250-23 User manual

Compact Vane Anemometer
with NIST-Traceable Calibration
Model 20250-23
THE STANDARD IN PRECISION MEASUREMENT
User Manual

2
Introduction
The Digi-Sense Compact Vane Anemometer (Model 20250-23) measures air
velocity in units of m/s, MPH, FPM, KNT, and KPH. Advanced features include
an automatic backlight, MAX/AVG readings, and automatic power-off. The
instrument is fully tested and calibrated to NIST-traceable standards. Careful
use of this meter will provide years of reliable service.
Unpacking
Check individual parts against the list of items below. If anything is missing
or damaged, please contact your instrument supplier immediately.
1. Meter
2. One 9 V battery
3. User manual
4. NIST-traceable calibration report with data
Meter Description
1. Vane sensor
2. Power ON/OFF button
3. Auto backlight sensor
4. Low-battery indicator
5. Figure display
6. Units display
7. MAX/AVG button
8. MAX display
9. AVG display
Display Layout
1. Low-battery indicator
2. MAX: Max Hold function engaged
for the air velocity function
3. AVG: Air averaging mode
4. m/s, MPH, FPM, KNT, KPH: Air velocity units of measure
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9
1 2 3
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3
Setup and Operation
Taking measurements
1. Turn on the meter using the Power On/Off button.
2. Press the MAX/AVG button for three seconds to select the desired unit of
measure. Note: At power-up the meter will display the unit of measure pre-
viously selected.
3. Hold the vane sensor in the area to be tested. Ensure that the airflow enters
the vane from the front of the meter and at a 90° angle to the fan.
4. Allow adequate time for readings to stabilize. View readings on the LCD.
5. Press the MAX/AVG button once to display the maximum measurement
reading.
6. Press the MAX/AVG button twice to enter the measurement averaging
mode.
Automatic backlight
The automatic backlight sensor is activated by low-light conditions,
eliminating the need for the user to manually switch the backlight on.
Automatic power-off
To conserve battery life, the meter automatically turns off after 15 minutes.
Battery replacement
When the low-battery icon appears on the LCD, the 9 V battery must be
replaced. To replace the battery, remove the battery cover on the back of the
instrument by applying a sliding force in the downward direction with your
thumb. With the battery cover removed, disconnect the old battery and snap
in the new battery. Slide the battery cover back into place.
Specifications
Air velocity Range Resolution Accuracy
m/s (meters per second) 1.1 to 30.00 m/s 0.01 m/s ±(3% + 0.20 m/s)
MPH (miles per hour) 0.9 to 67.0 MPH 0.1 MPH ±(3% + 0.4 MPH)
FPM (feet per minute) 80 to 5900 FPM 1 FPM ±(3% + 40 FPM)
KNT (knots: nautical MPH) 0.8 to 58.0 KNT 0.1 KNT ±(3% + 0.4 KNT)
KPH (kilometers per hour) 0.8 to 108.0 KPH 0.1 KPH ±(3% + 1.0 KPH)

Manual Part No. 00100-80
1065DGMAN_20250-23 Rev.1
For Product and Ordering Information, Contact:
Toll-Free: 1-800-358-5525
Phone: [phone]
Fax: [phone]
Davis.com/Digi-Sense
Sampling rate Approximately 1 reading per second
Sensors Conventional angled arms with low-friction ball bearing
Auto power-off Unit shuts off automatically after 15 min to preserve battery life
Operating temperature 32 to 122°F (0 to 50°C)
Operating humidity <80% RH
Storage temperature 14 to 140°F (–10 to 60°C)
Storage humidity <80% RH
Weight 4.9 oz (139 g) including battery and probe
Dimensions 61⁄2" x 21⁄8" x 13⁄8" (16.5 x 5.4 x 3.4 cm)
Power One 9 V battery
Battery life Typically 100 hrs. Battery life will be reduced significantly if the
automatic backlight is used continuously.
Battery current Approximately 6.5 mA DC
Specifications (continued)
Maintenance, Recalibration, and Repair
It is recommended that Digi-Sense products are calibrated annually to
ensure proper function and accurate measurements; however, your quality
system or regulatory body may require more frequent calibrations. To schedule
your recalibration, please contact InnoCal, an ISO 17025 calibration laboratory
accredited by A2LA.