Extech Mini Thermo-Anemometer User Manual
- June 7, 2024
- EXTECH
Table of Contents
Extech Mini Thermo-Anemometer
Introduction
Thank you for selecting the Extech 45168CP. This instrument measures Wind Speed, Temperature, RH%, Dew Point, Wet Bulb, and Wind Chill. The built-in 360o Compass also provides wind direction readings. Features include delta ∆T (Air Temp. minus Dew Point), MAX/AVG wind speed, Auto Power Off, and water resistant housing.
Operation
Opening the Meter
Swivel the meter out from its protective case to a maximum 180 degree angle. Use a 45 degree angle for tripod use (tripod mount on bottom of meter). Close the meter when not in use.
Turning the meter ON and OFF
- Press the button to turn the meter ON
- Press and hold the button to turn the meter OFF
- Auto Power OFF (APO) turns the meter OFF after 5 minutes of inactivity. To disable APO: With power OFF, press and hold both buttons until ‘n’ appears.
- If the meter does not switch ON, please check the battery.
Select the Mode of Operation and the Unit of Measure
- With the meter ON, use the MODE (M) button to step: Wind speed > MAX wind speed > 10 sec. AVG wind speed > compass > air temperature > wind chill (WCI) > relative humidity (%RH) > wet bulb (WBT) > dew point (DP) > ∆T.
- In the Air Temperature mode, press the UNIT button to select oF or oC.
- In the Wind Speed mode, use the UNIT button to select unit of measure.
Wind Speed Measurement Notes
Position the meter so that the airflow enters the meter vane from the rear of
the meter. A tripod mount is located on the bottom of the meter for
convenience. Compass and Wind Direction (head/tail/cross) Modes
- Switch the meter ON and select the Compass mode
- Point meter in the direction of travel and read the heading on the LCD.
- Press and hold the UNIT button until ‘head-tail-cross’ appears at the bottom of the LCD; the reading will then flash 3 times. Release the UNIT button.
- Point the meter into the wind until there is a steady compass reading. Press and hold the UNIT button until the compass reading flashes 3 times.
- The head or tail wind value will display. Press UNIT to see the crosswind.
- Press the M button to return to the compass-only mode.
- Note the wind direction indicator (item 2, Meter Description section).
Wind Direction Considerations
The head-tail-crosswind is the relationship between travel direction and wind
direction. When wind direction is fixed and travel direction changes, the wind
resistance changes, for example the wind resistance for A is stronger than B
(see diagram) and C is stronger than D. When calculating head, tail, and
crosswind, first measure the travel direction (compass).
Compass Calibration
- In compass mode, press and hold the two buttons to access the 30 sec. timer.
- Rotate the meter twice slowly in the direction shown in the diagram. Each turn should be 15 seconds in duration.
- After the two turns, the LCD will show ‘END’ to confirm the calibration.
- Calibrate the meter before each use and always after a battery change.
Meter Description
- Vane impeller (impeller set screw on back)
- Wind direction indicator
- Temperature and Humidity sensors
- LCD Display
- ON/OFF, M (MODE) button
- UNIT button
- Battery compartment (back)
- Tripod mounting hole
- Storage case
- Lanyard holder
Maintenance
Battery Replacement
Turn the meter off before opening the battery compartment. Using a coin, turn
the battery compartment cover (back) CLOCKWISE to remove it. Once opened,
observe the position of the battery, placing the new one in the same position.
Secure the battery compartment before use. Please dispose of the battery
responsibly. Remove battery if meter is to be stored for a month or longer.
EU users are legally bound by the Battery Ordinance to return all used
batteries to community collection points or wherever batteries / accumulators
are sold. Disposal in household trash or refuse is prohibited.
Disposal: Follow the valid legal stipulations in respect of the disposal
of the device at the end of its lifecycle
Impeller Replacement
- Remove the rear set screw, located to the left of the impeller assembly.
- Twist the impeller assembly counter-clockwise to the OPEN (O) position and remove it.
- Install impeller by inserting & twisting the new impeller assembly clockwise to the LOCK (L) position.
- Tighten the set screw.
CFM Air Volume Measurements
Measure the area of the duct using the diagrams below for rectangular or
circular duct. If the duct measurements are made in inches, divide the inches
by 144 to get the area in square feet. Insert the area value (in square feet)
into the equations below. Note that the air velocity must also be inserted
into the cubic equations. 
CFM (ft3/min) = Air Velocity (ft/min) x Area (ft2)
CMM (m3/min) = Air Velocity (m/sec) x Area (m2) x 60
Specifications
| Measurement | Range | Resolution | Accuracy (% of rdg) |
|---|---|---|---|
| MPH (miles per hour) | 2.5~44.7 MPH | 0.1 MPH | ± (3% + 0.4 mph) |
| KPH (kilometers per hour) | 4.0 to 72.0 km/h | 0.1 km/h | ± (3% + 1.4 km/hr) |
| KNT (naut. miles/hour) | 2.1~38.9 knots | 0.1 knots | ± (3% + 0.6 knots) |
| MPS (meters per second) | 1.1~20.0 m/s | 0.1 m/s | ± (3% + 0.2 m/s) |
| FPM (feet per minute) | 216~3936 ft/min | 2 ft/min | ± (3% + 40 ft/min) |
| BF (Beaufort force) | 1~8 BF | 1 BF | ± 1 |
| Temperature | -15~50oC (5~122oF) | 0.1oF/C | ± 1.0oC (± 1.8oF) |
| Relative Humidity | 0.1~99.9% RH | 0.1% RH | ± 3% (10~90%) |
| Dew Point Temperature | -20~50oC (-4~122 oF) | 0.1oF/C | Calculation |
| Wet Bulb Temperature | -5~50oC (23~122 oF) | 0.1oF/C | Calculation |
| Compass | 0~360o | 1o | ± 2 o |
| Wind Chill | -20~50oC (-4~122 oF) | 0.1oF/C | ± 2% |
| Display | LCD with multifunction indicators | ||
| Sensors | Sapphire bearing, non-corrosive vane; Precision thermistor for |
temperature measurements; Capacitive RH sensor
AVG Mode| 10 reading averaging for wind speed mode
MAX Mode| MAX recalls the highest wind speed reading
Response time| Air Temperature and RH: 60 seconds (typical)
Water and Drop Resistant| Water resistant housing to 1m (3’) / Drop tested to
2m (6’)
Operating conditions| -15 to 50oC (5 to 122oF) / < 80% RH
Power supply| Lithium battery (CR-2032 or equivalent)
Dimensions / Weight| 140 x 45 x 25mm (5.5 x 1.8 x 1.0”) folded / 90g (3.2 oz.)
Vane diameter: 24mm (1.0”)
Safety Standard| EN 61326-1 (2013)
Two-year Warranty
FLIR Systems, Inc. warrants this Extech brand instrument to be free of defects in parts and workmanship for two years from date of shipment (a six-month limited warranty applies to sensors and cables). To view the full warranty text please visit: http://www.extech.com/support/warranties.
References
Read User Manual Online (PDF format)
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