Extech 407123 Operating Manual

User's Guide

Hot Wire Thermo-Anemometer Model 407123

Introduction

Congratulations on your purchase of the Extech Hot Wire Anemometer. This instrument 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 sliding cover. The meter includes an RS-232 PC Interface jack for use with the Model 407001 Data Acquisition software and interface cable kit. This meter is shipped fully tested and calibrated and, with proper use, will provide years of reliable service.

Specifications

General Specifications

Circuit configuration Display 3-1/2 digit (2000 count) dual LCD display Measurements m/s (meters per second), km/h (kilometers per hour), ft/min

Data hold Freezes reading on display Sensor Structure Air velocity sensor: Glass bead 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

Operating Temperature

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)

Range Specifications

Units

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)*

Temperature 32 to 122 oF (0 to

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

Custom one-chip LSI microprocessor circuit

(feet/per minute), knots (nautical miles per hour), hour), Temperature: °C, °F

Temperature sensor: Precision thermistor

software and interface cable kit 32 to 122°F (0 to 50 °C)

MPH (miles per

Sensor: 0.5” (12mm) diameter Telescope: 7’ (2.1m) maximum length with cable

Range Resolution Accuracy

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

0.1 oF and oC 1.5 oF (0.8 oC)

Model 407123 V6.0 August 2007

Description

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)

Sensor Tip Description

1. Air Direction indentation

2. Air Velocity Sensor

3. Sensor cover in lower (measurement) open position

4. Sensor cover in upper (zero) closed position

5. Temperature sensor

Model 407123 V6.0 August 2007

+ 5 hidden pages