Digi-Sense 20250-15 User Manual
User Manual
THE STANDARD IN PRECISION MEASUREMENT
Professional CFM/CMM
Vane Thermoanemometer
with NIST-Traceable Calibration
Model 20250-15
2
Introduction
The Digi-Sense Professional CFM/CMM Vane Thermoanemometer (Model
20250-15) provides precision air velocity, airflow (volume), and temperature
measurements. The large, easy-to-read backlit LCD includes primary and
secondary displays plus numerous status indicators. The meter features
16 memory locations (8 for CFM and 8 for CMM) to store and recall commonly
used area sizes. 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. Anemometer vane sensor on 3.9 ft (120 cm) cable
3. Hard carrying case
4. One 9 V battery
5. User manual
6. NIST-traceable calibration report with data
Meter Description
1. LCD
2. Vane sensor
3. Temperature buttons
4. Power On/Off button
5. Airflow/velocity buttons
6. AVG
7. Backlight
1
7
6
5
2
3
4
3
Keypad
• POWER Press to turn the meter
ON or OFF
• MAX/MIN Used to record and store
the highest, lowest and average airflow or velocity readings.
(LEFT) also serves as change decimal point button in AREA mode
• UNITS Press to select the mode of
operation. In FLOW mode, the meter
displays air volume. In VELOCITY
mode, the meter displays air speed.
(UP) also serves as increase number button in AREA mode.
• AVG Used to Average multiple read-
ings in FLOW or VELOCITY mode.
Up to 20 readings can be averaged.
• HOLD Press to freeze the displayed
reading. Press again to unlock display. This button also functions as
the (RIGHT) scroll button in AREA
mode.
• AREA/ NEXT Press and hold to
manually enter the area of a duct in
CFM or CMM mode. In AREA mode,
used to select memory locations 1
through 8.
•
Press to turn the backlight on/off
• MAX/MIN (Temperature) Used to
record and store the highest, lowest
readings for air temperature.
• HOLD (Temperature) Press to freeze
the displayed temperature reading.
Press again to unlock the display.
Press and hold for 3 seconds to
switch between °C and °F. Meter will
beep twice to indicate change.
4
Display Layout
• REC (top of LCD): indicates that min/
max temperature function is running
• MAX (top of LCD): maximum hold
function engaged for an air temperature
measurement
• MIN (top of LCD): minimum hold
function engaged for an air temperature
measurement
• HOLD (top of LCD): data hold function
engaged for an air temperature
measurement
• °C / °F: temperature units of measure
•
: Low-battery indicator
• AREA (ft
2
, m2): units for area dimensions
• VEL: indicates that meter is in air
velocity mode
• FLOW: indicates that meter is in
airflow mode
• CFM/CMM: airflow units of measure
• m/s, ft/min, km/h, MPH, knots: air
velocity units of measure
• X10, X100: multipliers for airflow
readings
• REC: indicates that min/max function is
running (top for temp, bottom for air)
• MAX (bottom of LCD): maximum hold
function for an air velocity and airflow
measurement
• MIN (bottom of LCD): minimum hold
function for an air velocity and airflow
measurement
• AVG: air averaging mode
• HOLD (bottom of LCD): Data Hold for an
Air Velocity and Airflow function
Large LCD digits at bottom of display
for air velocity and airflow
Smaller LCD digits at top right of display
for probe temperature
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