User Manual
CFM100
Thermo-Anemometer
Introduction
Congratulations on your purchase of the Triplett CFM100 ThermoAnemometer. The CFM/CMM Thermo Anemometer instrument measures
Air Velocity, Air Flow (volume) and Temperature. The large, easy-to-read
backlit LCD includes primary and secondary displays plus numerous status
indicators.
Safety
Do not operate the meter in environments where the following are
present: explosive gases (or materials), combustible gases (or
materials), steam, or dust.
Please replace the battery immediately when the low battery symbol
appears on the LCD.
Do not touch the meter’s circuit board for any reason; static
electricity or contamination could damage the sensitive
components.
This instrument was designed for pollution
degree 2. Operation Altitude: Up to 2000m
(7000’).
Description
1. Vane Anemometer (Sensor) Input Connector
2. Vane Anemometer Sensor
3. Right Side Function Buttons (°C/F, UNITS, HOLD)
4. Left Side Function Buttons (Backlight, MAX/MIN, AREA)
5. LCD Display
Display Overview
VEL: indicates that meter is in air velocity mode
FLOW: indicates that meter is in air flow mode
MAX (bottom of LCD): Max Hold for the Air Velocity and Air Flow
function
HOLD (bottom of LCD): Data Hold for the Air Velocity and Air Flow
function
oC / oF: Temperature units of measure
CFM/CMM: airflow units of measure
AREA(ft2, m2): units for area dimensions
m/s, ft/min, km/h, MPH, knots: air velocity units of measure
X10, X100: multipliers for air flow readings
AVG: air averaging mode
REC: indicates that min/max function is running (top for temp, bottom
for air)
Large LCD digits at bottom of display for Air Velocity and Air Flow
Smaller LCD digits at top, right of display for Probe Temperature
: :Low battery indicator
airflow
Arrow
Side view of Vane
Operation
Connecting the Vane
1. The vane plug is inserted in the meter’s sensor jack at the top of the
meter. The plug and jack are keyed so that the plug can only fit in the jack
one way.
2. Turn the plug carefully until it lines up with the jack and then firmly push
the plug in place. Do not apply undue force or try to twist the plug side-toside.
3. If the vane is not connected to the meter or if the sensor is defective, the
LCD display will indicate OL in place of a Temperature reading.
Air Velocity Measurements (Single Point)
1. Turn on the meter using the ON/OFF button.
2. Press UNITS button to select the desired unit
of measure. NOTE: At power up the meter will
display the last unit of measure previously
entered.
3. Place the sensor in the air stream. Ensure that
the air enters the vane as indicated by the
arrow sticker placed inside the vane.
4. View the readings on the LCD Display. The
large main LCD display shows the Air Velocity
reading. The upper right LCD sub-display
shows the temperature reading.
Air Flow Measurements (CMM / CFM)
airflo
Arro
w
Side view of
1. Turn on the meter using the ON/OFF button
2. Press the UNITS button to select the desired air flow
units: CMM (cubic meters per minute) or CFM (cubic
feet per minute). NOTE: At power up the meter will
display the last unit of measure previously entered.
3. To begin entering the area in m2 or ft2, press and
hold the AREA button until it beeps twice. The
leftmost digit of the bottom display will begin to flash.
4. Place the sensor in the air stream. Ensure that the
air enters the vane as indicated by the arrow sticker
placed inside the vane. Refer to the diagram. The
large main LCD display shows the Air Velocity
reading. The upper right LCD sub-display shows the
temperature reading.
The meter has 2 memory locations (1 for CFM and 1 for CMM) that can be used
to store commonly used area sizes that you can recall at anytime.
1. Press the AREA button until meter beeps twice. A memory location
number will appear in the top right of the display indicating the memory
location.
2. Use the UNITS button to change the flashing digit
Use the MAX/MIN button to move the decimal
After all of the digits are entered, press and hold the AREA button (until
it beeps twice) to save the area into memory and return to CFM or CMM
measuring mode.
Data Hold (Air Velocity/Air Flow)
1. While taking measurements, press the HOLD button to freeze the air
velocity/air flow reading.
2. The HOLD indicator will appear in the bottom of the LCD display.
3. Press HOLD again to return to normal operation.
MAX/MIN/AVG Record (Air Velocity/Air Flow)
This allows the user to record and view the highest (MAX), lowest (MIN) and
average (AVG) readings.
1. Press the button MAX/MIN button. The MAX indicator and RECORD
indicator along with the Max reading will appear on the LCD display and
the meter will begin keeping track of the MAX, MIN and Average values.
2. Press the MAX/MIN button again to view the minimum reading. The MIN
indicator along with the minimum reading will appear on the LCD display.
3. Press the MAX/MIN button again to view the average reading. The AVG
indicator along with the average reading will appear on the LCD display.
NOTE: Average recording will stop automatically after 2
hours, and the upper LCD sub-display will show an OFF (only
in the average mode).
4. Press the MAX/MIN button again to display current readings. NOTE: the
meter will keep recording MAX/MIN/AVG readings.
5. To clear and stop MAX/MIN/AVG recording and return to normal
operation, press and hold the MAX/MIN button until the meter beeps
twice.
Automatic Power OFF
To conserve battery life, the meter automatically turns off after 18 minutes. To
defeat this feature:
1. Turn the meter OFF.
2. Press and hold the (Backlight) key while turning the meter ON.
3. “dis APO” will appear in the display. The AUTO POWER OFF feature will
now be disabled.
4. Note that AUTO POWER OFF is re-enabled each time the meter is turned
5. Also note that AUTO POWER OFF is disabled in CFM/CMM or Average
on.
mode.
Battery Replacement
When appears on the LCD, the 3*1.5V AA battery must be replaced.
1. Disconnect the sensor.
2. Remove the meter’s rubber protective jacket
3. Use a Phillips screwdriver to open the rear battery compartment
4. Replace the 3*1.5V AA battery
5. Close the battery compartment and replace the meter’s protective jacket
Specifications
Air Velocity
Range
Resolution
Accuracy
m/s (meters per sec)
0.40 - 30.00 m/s
0.01 m/s
± (3% + 0.20
m/s)
km/h (kilometers/hour)
1.4 - 108.0 km/h
0.1 km/h
± (3% + 0.8
km/hr)
ft/min (feet per minute)
80 – 5900 ft/min
1 ft/min
± (3% + 40
ft/m)
mph (miles per hour)
0.9 – 67.0 mph
0.1 mph
± (3% + 0.4
MPH)
knots (nautical MPH)
0.8 to 58.0 knots
0.1 knots
± (3% + 0.4
knots)
Air Flow
Range
Resolution
Area
CMM (cubic meters/min)
0-999900 m3/min
0.001 to
100
0 .000 to
999.9m2
CFM (cubic ft/min)
0-999900 ft3/min
0.001 to
100
0.000 to
999.9ft2
Air Temperature
Range
Resolution
Accuracy
32 - 122oF (0 - 50oC)
0.1oF/C
4.0oF (2.0oC)
General Specifications
Circuit Custom LSI microprocessor circuit
Display Dual function 4-digit LCD
Sampling rate 1 reading per second approx.
Sensors Air velocity/flow sensor: Conventional angled
Automatic Power off Auto shut off after 20 minutes to preserve battery
Operating Temperature 32 to 122°F (0 to 50°C)
Storage Temperature 14 to 140oF (-10 to 60oC)
Operating Humidity <80% RH
Storage Humidity <80% RH
Operating Altitude 2000 meters (7000ft) maximum
Battery (3) 1.5V AAA batteries
Battery life 40 hours approx. (if the Backlight is used
Battery Current 8.3 mA DC approx.
vane arms with low-friction ball bearing
Temperature sensor: NTC-type precision
thermistor
continuously, battery life will be reduced
significantly)
Useful Equations and Conversions
Width (W)
Height (H)
Area (A) = Width (W) x Height (H)
CFM (ft3/min) = Air Velocity (ft/min) x Area (ft2)
CMM (m3/min) = Air Velocity (m/sec) x Area (m2) x 60
Radius
Area (A) = x r2
Where = 3.14 and r2 = radius x
radius
Area equation for rectangular or square ducts
Area equation for circular ducts
Cubic equations
NOTE: Measurements made in inches
must be converted to feet or meters before using the above formulae.
Unit of Measure Conversion Table
m/s
ft/min
knots
km/h
MPH
1 m/s 1 196.87
1.944
3.6
2.24
1 ft/min
0.00508
1
0.00987
0.01829
0.01138
1 knot
0.5144
101.27 1 1.8519
1.1523
1 km/h
0.2778
54.69
0.54 1 0.6222
1 MPH
0.4464
87.89
0.8679
1.6071
1
Warranty Information
Triplett / Jewell Instruments extends the following warranty to the original purchaser of
these goods for use. Triplett warrants to the original purchaser for use that the products sold
by it will be free from defects in workmanship and material for a period of (1) one year from
the date of purchase. This warranty does not apply to any of our products which have been
repaired or altered by unauthorized persons in any way or purchased from unauthorized
distributors so as, in our sole judgment, to injure their stability or reliability, or which have
been subject to misuse, abuse, misapplication, negligence, accident or which have had the
serial numbers altered, defaced, or removed. Accessories, including batteries are not
covered by this warranty
Copyright © 2020 Triplett
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