EXTECH 407123 Hot Wire Thermo Anemometer User Manual

: June 13, 2024
: EXTECH

Table of Contents

EXTECH 407123 Hot Wire Thermo Anemometer
Product Information
Product Usage Instructions
Operation
Specifications
Useful Equations and Conversions
References
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EXTECH 407123 Hot Wire Thermo Anemometer

Product Information

The Hot Wire Thermo-Anemometer Model 407123 is a device used to measure air velocity and temperature. It features a sensor tip with an air velocity sensor, air direction indentation, and a temperature sensor. The meter has a large main LCD display for air velocity readings and a lower LCD sub-display for temperature readings. It also includes push-buttons for power control, freezing the displayed reading, selecting temperature units, tracking highest and lowest readings, recalling maximum and minimum readings, selecting air velocity units, and zeroing the display. The meter requires six AAA 1.5V batteries for operation. It has a battery compartment located on the lower back of the meter, which can be accessed by removing the protective rubber holster.

Product Usage Instructions

Initialization and Zero
Connect the sensor to the input jack on top of the meter and open the antenna to the desired length.
Turn on the meter using the Power button. The meter will perform a self-test.
Select the desired temperature units using the C/F select button.
Select the desired air velocity units using the UNIT button.
Place the sensor cover in the UP (ZERO) position.
Place the sensor in the area to be measured and allow time for it to reach the temperature of the air under test.
Press the ZERO button to zero the meter.
Taking Measurements
Zero the meter as described above.
Slide the air velocity sensor cover down.
Place the sensor in the air current to be measured, ensuring that the air flow meets the sensor head in the direction of the indentation on the sensor head.
View the air velocity and temperature readings on the LCD display.
MIN and MAX Function
To begin capturing the Minimum (MIN) and Maximum (MAX) readings, press the RECORD button.
Take readings as described previously.
Press the RECALL button to view the Maximum reading encountered since pressing the RECORD button.
Press RECALL again to view the minimum reading (MIN).
Press the RECORD button to exit this mode and return to normal operation.
Data Hold

To freeze the LCD display, press the HOLD button. Press it againto return to normal operation.

Battery Replacement
Remove the protective rubber holster.
Open the rear battery compartment using a flat-head screwdriver or a coin.
Replace the six AAA 1.5V batteries, observing polarity.
Replace the battery compartment cover and the protective holster.

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.
Description

Meter Description

LCD display – Indicates air velocity and temperature readings, units of measure, low battery icon, and other user alerts
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)
Protective holster – Rubber jacket that surrounds the meter (must be removed to access battery compartment)
Battery compartment – Located on the lower back of the meter
PC Interface jack – Accepts a 3.5mm plug from a PC interface cable (cable and data acquisition software available using part number 407001)
Sensor input jack – Insert the sensor plug
Sensor opening – Air must flow through this opening for proper measurement
Telescoping sensor handle – Extends to 39” (1m)
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

Air Direction indentation
Air Velocity Sensor
Sensor cover in lower (measurement) open position
Sensor cover in upper (zero) closed position
Temperature sensor

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.

Notes

The meter does not display negative numbers.
Open antenna to desired length.

Connect the sensor to the input jack on top of the meter and open antenna to desired length.
Turn on the meter using the Power button. The meter will perform a self-test during which the display will count down from 9 to 0.
Select the desired temperature units using the C/F select button. The LCD will reflect the selection.
Select the desired air velocity units using the UNIT button. The LCD will reflect the selection.
Place the sensor cover in the UP (ZERO) position.
Place the sensor in the area to be measured and allow a short time for the sensor to reach the temperature of the air under test.
Press the ZERO button to zero the meter.

Taking Measurements

Zero the meter as described above.
Slide the air velocity sensor cover down.
Place the sensor in the air current to be measured. Have the air flow meet the sensor head in the direction of the indentation on the sensor head.
View the air velocity and temperature readings on the LCD Display. The large main LCD display indicates the Air Velocity reading. The lower LCD sub-display indicates the temperature reading.

MIN and MAX Function

To begin capturing the Minimum (MIN) and Maximum (MAX) readings, press the RECORD button. The ‘REC’ icon will appear on the LCD.
Take readings as described previously.
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.
Press RECALL again to view the minimum reading (MIN).
Press the RECORD button to exit this mode and return to normal operation.

Data Hold
To freeze the LCD display, press the HOLD button. The ‘DH’ display icon will appear on the LCD. Press the HOLD button again to return to normal operation (the ‘DH’ hold icon will switch off).

Battery Replacement
When the low battery indicator (LBT) appears on the LCD or if the LCD does not switch on when the POWER button is pressed, replace the batteries.

Remove the protective rubber holster that encapsulates the meter.
Open the rear battery compartment by prying the compartment off with a flat-head screwdriver or a coin.
Replace the six ‘AAA’ 1.5V batteries observing polarity.
Replace the battery compartment cover and the protective holster.

PC Interface
The meter is equipped with an RS-232 PC Interface jack at the top of the meter (next to the sensor input jack). For streaming of data to a PC via the RS232 Output jack, the optional 407001-USB kit (RS232 to USB cable and driver CD) along with the 407001 software (available free at www.extech.com) are required.

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)*

±(3.0%rdg+1.1km/h)*

±(3.0%rdg+59ft/min)*

±(3.0%rdg+0.67MPH)*

±(3.0%rdg+0.58knots)*

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

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 linear velocity (i.e., feet per minute). This gives: ft/min x ft2 = ft3/min (CFM)

Cubic equations

CFM (ft3/min) = Air Velocity (ft/min) x Area (ft2)
CMM (m3/min) = Air Velocity (m/sec) x Area (m2) x 60

Units Conversion Table

| m/s| ft/min| knots| km/hr| MPH
---|---|---|---|---|---
1 m/s| 1| 196.87| 1.944| 3.6| 2.24
1 ft/min| 0.00508| 1| 0.00987| 0.01829| 0.01138
1 knot| 0.5144| 101.27| 1| 1.8519| 1.1523
1 km/hr| 0.2778| 54.69| 0.54| 1| 0.6222
1 MPH| 0.4464| 87.89| 0.8679| 1.6071| 1

Warranty
FLIR Systems, Inc. warrants this Extech Instruments brand device to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies to sensors and cables). If it should become necessary to return the instrument for service during or beyond the warranty period, contact the Customer Service Department for authorization. Visit the website www.extech.com for contact information. A Return Authorization (RA) number must be issued before any product is returned. The sender is responsible for shipping charges, freight, insurance and proper packaging to prevent damage in transit. This warranty does not apply to defects resulting from action of the user such as misuse, improper wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification. FLIR Systems, Inc. specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct, indirect, incidental or consequential damages. FLIR’s total liability is limited to repair or replacement of the product. The warranty set forth above is inclusive and no other warranty, whether written or oral, is expressed or implied.

Calibration, Repair, and Customer Care Services
FLIR Systems, Inc. offers repair and calibration services for the Extech Instruments products we sell. NIST certification for most products is also provided. Call the Customer Service Department for information on calibration services available for this product. Annual calibrations should be performed to verify meter performance and accuracy. Technical support and general customer service is also provided, refer to the contact information provided below.

Support Lines: U.S. (877) 439‐8324; International: +1 (603) 324‐7800