Extech Model 45158 Mini Hygro Thermo-Anemometer

Brand: Extech

Model: 45158

Introduction

Congratulations on your purchase of Extech's Model 45158 Anemometer. The dual display indicates Air Velocity and Humidity, Dew Point, Ambient Temperature, or Temperature with wind-chill factor. With careful use, this meter will provide years of reliable service.

Operation

Turning the meter ON and OFF

Press the ON/OFF/HOLD button to turn the meter ON.
Press and hold the ON/OFF/HOLD buttons for approximately 3 seconds to turn it OFF.
The meter's Auto Power OFF feature turns the meter OFF after 20 minutes of inactivity.

Change the lower display parameter

With the meter ON, press and hold down the ON/OFF/HOLD button.
While continuing to hold the ON/OFF/HOLD button, press the UNITS/MODE button repeatedly to step through Temperature (°F/°C), Humidity (RH%), Dew Point (TD), & Temperature with wind-chill factor (WCI). Note that the center display is Air Velocity.

Change the Air Velocity unit of measure

Turn the meter OFF. Press and hold down both buttons until the display turns on and begins blinking, then release both buttons.
Press the UNITS/MODE button repeatedly to step through the units (see specifications for list).
After 5 seconds, the meter switches back to normal operation mode automatically.

Select temperature units (°C or °F)

Turn the meter OFF first. Press and hold down both buttons until the display turns on and begins blinking, then release the buttons.
Press both buttons momentarily to change temperature units.
After 5 seconds, the meter switches back to normal operation mode automatically.

Taking Measurements

Position the meter so that the airflow enters the meter vane from the rear of the meter (opposite side of front panel logo). A tripod mount is located on the bottom of the meter.

Max Hold

Max Hold represents the highest measurement taken since the meter was turned on.
Press the UNITS/MODE button to display the Max reading (MAX icon appears).
Press the UNITS/MODE button repeatedly to step through to the normal operating mode.

Average mode

5 or 10 reading averages can be displayed in the Average Mode.
Press UNITS/MODE 3 times for 5 reading averaging or 4 times for 10 readings.
To exit this mode, press the UNITS/MODE button until the icons on the left disappear.

Data Hold

Data Hold freezes the most recent displayed reading.
Press and hold the ON/OFF/HOLD button to activate Data Hold.
As long as the ON/OFF/HOLD button is held, the reading will remain on the LCD.

Meter Description

The meter consists of the following components:

Number	Component
1	Vane impeller
2	Impeller set screw (on rear of meter)
3	Relative Humidity sensor
4	Temperature sensor
5	LCD display
6	ON/OFF, HOLD key
7	UNITS, MODE key
8	Battery compartment (on rear)
9	Tripod mounting hole
10	Lanyard (neckstrap)

Diagram Description: A diagram shows the Extech Mini Thermo-Anemometer with numbered callouts pointing to its various parts: the vane impeller (1), impeller set screw (2), humidity sensor (3), temperature sensor (4), LCD display (5), ON/OFF/HOLD button (6), UNITS/MODE button (7), battery compartment (8), tripod mount (9), and lanyard attachment point (10).

Specifications

Measurement Specifications

Measurement	Range	Resolution	Accuracy (% of reading)
MPH (Miles per hour)	2.5 to 44.7 MPH	0.2 MPH	± (3% + 0.4 mph)
km/hr (kilometers per hour)	4.0 to 72.0 km/h	0.7 km/h	± (3% + 1.4 km/hr)
Knots (nautical miles per hour)	2.1 to 38.9 knots	0.3 knots	± (3% + 0.6 knots)
m/sec (meters per second)	1.1 to 20.0 m/s	0.1 m/s	± (3% + 0.2 m/s)
ft/min (feet per minute)	216 to 3936 ft/min	20ft/min	± (3% + 40 ft/min)
Beaufort force	1 to 8 BF	1 BF	± 1
Temperature	0 to 122°F (-18 to 50°C)	0.1°F/°C	± 1.8°F (± 1°C)
Relative Humidity	10 to 95%	1%	± 5% RH
Dew Point	32 to 122°F (0 to 50°C)	0.1°F/°C	± 3.6°F (2°C)

General Specifications

Display	Dual LCD with low battery and multifunction indicators
Sensors	Sapphire bearing, non-corrosive vane for air velocity; Precision thermistor for temperature measurements
Average Mode	Choice of 5 or 10 reading averaging (2 second factory default)
Max and Data Hold Displays	Max recalls the highest reading; Data Hold freezes the display
Sample time	1 reading per second for air velocity and temperature (1 reading per 15 seconds for humidity with 2 second updates)
Water-resistant	To 3' (1m)
Operating conditions	5 to 122°F (-15 to 50°C) / < 80% RH
Power supply	Lithium battery (CR-2032 or equivalent) / 400 hour battery life
Dimensions / Weight	Instrument: 133 x 70 x 19mm (5.25 x 2.75 x 0.75") Vane: 1' (24mm) diameter /3 oz. (95 g)

Maintenance

Battery Replacement

The 45158 has a low battery indicator (?). Important: Turn the meter OFF before opening the battery compartment. Using a coin, turn the battery compartment cover clockwise (↪️) to remove it. Once opened, observe the position of the battery, placing the new one in the same position. Secure the battery compartment cover and dispose of the lithium battery in accordance with local, state, or national disposal codes. All 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.

Other Battery Safety Reminders

Never dispose of batteries in a fire. Batteries may explode or leak.
Never mix battery types. Always install new batteries of the same type.

Impeller Replacement

Remove the set screw next to the impeller assembly (on the rear of the meter).
Twist the impeller assembly counter-clockwise to the OPEN position and remove it.
Install impeller by inserting & twisting the new impeller assembly clockwise.
Tighten the set screw.

CFM Measurements

Measure the area of the duct using the diagrams below for rectangular and circular ducts (If the duct measurements are made in inches, divide the inches by 144 to get the area in square feet). Plug the area value (in square feet) in the cubic equations below. Note that the air velocity must be plugged into the cubic equations also.

Diagram Description: A diagram shows a rectangle labeled 'w' for width and 'h' for height. Below it is the formula A = w * h.

Diagram Description: A diagram shows a circle with radius 'r' labeled. Below it is the formula A = πr².

CFM (ft³/min) = Air Velocity (ft/min) x Area (ft²)

CMM (m³/min) = Air Velocity (m/sec) x Area (m²) x 60

Two-year Warranty

Teledyne FLIR LLC 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: https://www.extech.com/support/warranties.

Calibration and Repair Services

Teledyne FLIR LLC offers calibration and repair services for the Extech brand products we sell. We offer NIST traceable calibration for most of our products. Contact us for information on calibration and repair availability, refer to the contact information below. Annual calibrations should be performed to verify meter performance and accuracy. Product specifications are subject to change without notice. Please visit our website for the most up-to-date product information: www.extech.com.

Contact Customer Support

Customer Support Telephone List: https://support.flir.com/contact

Calibration, Repair, and Returns: repair@extech.com

Technical Support: https://support.flir.com

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