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User's Guide

Hot Wire Thermo-Anemometer

Model 407123

Introduction

Congratulations on your purchase of the Extech Hot Wire Anemometer. This meter

measures air flow and temperature by placing the sensor into an airway such as a duct or

a vent. The sensor is situated at the end of the telescoping wand for convenience and has

a protective cover that slides up and down. The meter includes an RS-232 PC Interface

jack for use with the Model 407001 Data Acquisition software and interface cable kit.

Careful use of this meter will provide years of reliable service.

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 Extech 407123 Product Page

Summary of content (6 pages)

PAGE 1
99 Washington Street Melrose, MA 02176 Phone 781-665-1400 Toll Free 1-800-517-8431 User's Guide Visit us at www.TestEquipmentDepot.com Back to the Extech 407123 Product Page Hot Wire Thermo-Anemometer Model 407123 Introduction Congratulations on your purchase of the Extech Hot Wire Anemometer. This meter measures air flow and temperature by placing the sensor into an airway such as a duct or a vent.
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Specifications General Specifications Circuit configuration Custom one-chip LSI microprocessor circuit Display 3-1/2 digit (2000 count) dual LCD display Measurements m/s (meters per second), km/h (kilometers per hour), ft/min (feet/per minute), knots (nautical miles per hour), MPH (miles per hour), Temperature: °C, °F Data hold Freezes reading on display Sensor Structure Air velocity sensor: Glass bead thermistor Temperature sensor: Precision thermistor Min/Max Recording Record and Recall Maximum
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Meter Description 1. LCD display – Indicates air velocity and temperature readings, units of measure, low battery icon, and other user alerts 9 2. Push-buttons: • POWER: Turn meter ON and OFF • HOLD: Freezes the displayed reading • C/F: Select the temperature units • RECORD: Press to track the highest (MAX) and lowest (MIN) reading • RECALL: Displays MAX/MIN readings • UNIT: Air velocity units of measure • ZERO: Press to zero the display (sensor cover must be closed) 3.
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Operation Initialization and Zero The meter should always be zeroed at temperature before use using the ZERO button. Do not rely on the initial zero display. Note: The meter does not display negative numbers. Open antenna to desired length. 1. Connect the sensor to the input jack on top of the meter and open antenna to desired length. 2. Turn on the meter using the Power button. The meter will perform a self-test during which the display will count down from 9999 to 0000. 3.
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MIN and MAX Function 1. To begin capturing the Minimum (MIN) and Maximum (MAX) readings, press the RECORD button. The ‘REC’ icon will appear on the LCD. 2. Take readings as described previously. 3. Press the RECALL button to view the Maximum reading encountered since the RECORD button was pressed. The ‘MAX’ display icon will appear along with the maximum reading. 4. Press RECALL again to view the minimum reading (MIN). 5. Press the RECORD button to exit this mode and return to normal operation.
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Useful Equations and Conversions Area equations The volume of air flowing through a duct or vent can be determined by taking the area of the duct in square units (i.e. square feet) and multiplying this value by the measured 2 3 linear velocity (i.e., feet per minute).