MODEL 45168CP
Model 45168CP-mul_V1.3
1
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 360
o
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
o
F or
o
C.
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
1
Vane impeller (impeller set screw on back)
2
Wind direction indicator
3
Temperature and Humidity sensors
4
LCD Display
5
ON/OFF, M (MODE) button
6
UNIT button
7
Battery compartment (back)
8
Tripod mounting hole
9
Storage case
10
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 (ft
3
/min) = Air Velocity (ft/min) x Area (ft
2
)
CMM (m
3
/min) = Air Velocity (m/sec) x Area (m
2
) x 60
Specifications
Measurement
Range
Resolution
Accuracy (% of rdg)
MPH (miles per hour)
0.5~44.7 MPH
0.1 MPH
± (3% + 0.4 mph)
KPH (kilometers per hour) 0.8 to 72.0 km/h
0.1 km/h
± (3% + 1.4 km/hr)
KNT (naut. miles/hour)
0.4~38.8 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)
60~3937 ft/min
2 ft/min
± (3% + 40 ft/min)
BF (Beaufort force)
1~8 BF
1 BF
± 1
Temperature
-15~50
o
C (5~122
o
F)
0.1
o
F/C
± 1.0
o
C (± 1.8
o
F)
Relative Humidity
0.1~99.9% RH
0.1% RH
± 3% (10~90%)
Dew Point Temperature
-20~50
o
C (-4~122
o
F) 0.1
o
F/C
Calculation
Wet Bulb Temperature
-5~50
o
C (23~122
o
F)
0.1
o
F/C
Calculation
Compass
0~360
o
1
o
± 2
o
Wind Chill
-20~50
o
C (-4~122
o
F) 0.1
o
F/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 50
o
C (5 to 122
o
F) / < 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)
Copyright
©
2015 FLIR Systems, Inc.
All rights reserved including the right of reproduction in whole or in part in any form
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