Extech Instruments 407123 User Manual

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.

Model 407123 V5.2 2/2006

2

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 (MAX) and Minimum (MIN) readings
PC Interface RS 232 PC serial interface jack for use with Model 407001

software and interface cable kit
Operating

Temperature

32 to 122°F (0 to 50 °C)

Operating Humidity Max. 80% RH
Power Supply Six (6) 1.5V ‘AAA’ batteries
Power Consumption Approx. 30 mADC
Weight 0.78 lb (355 g) including batteries & probe
Dimensions Main instrument: 7.1 x 2.8 x 1.3” (180 x 72 x 32 mm)

Sensor: 0.5” (12mm) diameter

Telescope: 7’ (2.1m) maximum length with cable

Range Specifications

Units

Range Resolution Accuracy

m/s 0.2 to 20.0 m/s 0.1 m/s ±(3.0%rdg+0.3m/s)*

km/h 0.7 to 72.0 km/h 0.1 km/h ±(3.0%rdg+1.1km/h)*

ft/min 40 to 3940 ft/min 1 ft/min ±(3.0%rdg+59ft/min)*

MPH 0.5 to 45.0 MPH 0.1 MPH ±(3.0%rdg+0.67MPH)*

knots 1.0 to 31.0 knots 0.1 knots ±(3.0%rdg+0.58knots)*

*or, ±(1.0%FS+3d) whichever is greater

Temperature 32 to 122

o

F (0 to

50

o

C)

0.1 oF and

o

C 1.5

o

F (0.8

o

C)

Note: m/s: meters per second; km/h: kilometers per hour; ft/min: feet per minute; Knots:
nautical miles per hour; MPH: miles per hour

Model 407123 V5.2 2/2006

3

9

Meter Description

1. LCD display – Indicates air velocity and
temperature readings, units of measure,
low battery icon, and other user alerts

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. Protective holster – Rubber jacket that
surrounds the meter (must be removed
to access battery compartment)

4. Battery compartment - Located on the
lower back of the meter

5. PC Interface jack – Accepts a 3.5mm
plug from a PC interface cable (cable
and data acquisition software available
using part number 407001)

6. Sensor input jack – Insert the sensor
plug

7. Sensor opening – Air must flow through
this opening for proper measurement

8. Telescoping sensor handle – Extends to 39” (1m)

9. Sensor protective cover – Slide DOWN to open when in use and slide UP to protect
sensor when not in use (close the cover when zeroing the meter)