Extech Instruments 45158

User's Manual
Model 45158
Mini Hygro Thermo-Anemometer
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.
Specifications
Range Specifications
Measurement Range Resolution Accuracy (% of reading)
MPH (Miles per hour) 1.1 to 62.5 MPH 0.2 MPH ± (3% + 0.4 mph)
km/hr (kilometers per hour) 1.8 to 100.6 km/h 0.7 km/h ± (3% + 1.4 km/hr)
Knots (nautical miles per hour) 1.0 to 54.3 knots 0.3 knots ± (3% + 0.6 knots)
m/sec (meters per second) 0.50 to 28.00 m/s 0.01 m/s ± (3% + 0.2 m/s)
ft/min (feet per minute) 100 to 5500 ft/min 20ft/min ± (3% + 40 ft/min)
Beaufort force 1 to 17 BF 1 BF ± 1
Temperature 0 to 122
o
F (-18 to 50
o
C) 0.1
o
F/C ± 1.8
o
F (± 1
o
C)
Relative Humidity 10 to 95% 1% ± 5% RH
Dew Point 32 to 122
o
F (0 to 50
o
C) 0.1
o
F/C ± 3.6
o
F (2
o
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
o
F (-15 to 50
o
C) / < 80% RH
Power supply Lithium battery (CR-2032 or equivalent) / 400 hour battery life
Dimensions / Weight Instrument: 5.25 x 2.75 x 0.75” (133 x 70 x 19mm)
Vane: 1” ( 24mm ) diameter / 3 oz. ( 95 g )
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
Back to the 45158 Product Info Page

Extech Instruments 45158 Specifications

General

Brand	Extech Instruments
Model	45158
Category	Measuring Instruments
Language	English

Summary

Introduction

Specifications

Range Specifications

Details measurement ranges and resolutions for air velocity and environmental parameters.

General Specifications

Covers display, sensors, averaging modes, sample time, operating conditions, power, and dimensions.

Meter Description

Operation

Turning the Meter On and Off

Instructions for powering the device on, off, and its auto power-off feature.

Changing the Lower Display Parameter

Steps to cycle through and select parameters shown on the lower display.

Changing Air Velocity Units

Procedure to change the air velocity measurement units.

Selecting Temperature Units

Steps to switch between Celsius and Fahrenheit for temperature readings.

Taking Measurements

Guidance on positioning the meter and using advanced features like Max Hold, Average mode, and Data Hold.

CFM Measurements

Cubic Equations

Provides formulas for calculating CFM and CMM using air velocity and duct area.

Maintenance

Battery Replacement

Step-by-step guide on how to replace the device's battery safely and correctly.

Impeller Replacement

Instructions for removing and installing the impeller assembly for maintenance.

Unit of Measure Conversion Tables