Extech Instruments 407114 Manual de usuario

User's Manual

CFM Thermo Anemometer

Air Velocity, Air Flow, and Temperature

Model 407114

Model 407114 Version 2.0 November 20052

Introduction

Congratulations on your purchase of the Extech CFM Thermo Anemometer.

This instrument measures Air Velocity, Air Flow (volume) and Temperature.

The RS-232 PC interface provides data acquisition functionality. Proper use of

this meter will provide years of reliable service.

Model 407114 Version 2.0 November 20053

Specifications

General Specifications

Circuit Custom LSI microprocessor circuit

Display Dual function 0.5" (13 mm) 4-digit LCD

Measurement units Air Velocity: m/s, km/h, ft/min, knots, mph;

Air Flow: CMM (m3/min); CFM (ft3/min); Temp: °C & °F

Data hold Freezes displayed reading

Sampling rate 1 reading per second approx.

Sensors Air velocity/flow sensor: Conventional angled vane arms

with low-friction ball bearing.

Temperature sensor: Precision thermistor

MAX/MIN Memory Record and view Maximum and Minimum readings

Automatic Power off Auto shut off after 15 minutes to preserve battery life

Data Output RS 232 PC serial interface with 16-bit data stream

Operating Temperature 32°F to 122°F (0°C to 50°C)

Operating Humidity Max. 80% RH

Power Supply 9V battery

Power Current Approx. 8.3 mA DC

Weight 0.84 lbs. (381g) including battery & probe

Dimensions Main instrument: 7.1 x 2.8 x1.3" (180 x 72 x 32mm)

Sensor Head: 72mm Diameter

Range Specifications

Air Velocity Range Resolution Accuracy

(% rdg)

m/s (meters per sec) 0.40 - 25.00 m/s 0.01 m/s ± (2% + 0.2 m/s)

km/h (kilometers/hour) 1.4 - 90.0 km/h 0.1 km/h ± (2% + 0.8 km/hr)

ft/min (feet per minute) 80 – 4921 ft/min 1 ft/min ± (2% + 40 ft/m)

mph (miles per hour) 0.9 – 55.9 mph 0.1 mph ± (2% + 0.4 MPH)

knots (nautical MPH) 0.8 to 48.6 knots 0.1 knots ± (2% + 0.4 knots)

Air Flow Range Resolution Area

CMM (cubic meters/min) 0-999,900 m3/min 0.001 to

100 0 to 9,999m2

CFM (cubic ft/min) 0-999,900 ft3/min 0.001 to

100 0 to 9,999ft2

Air Temperature Range Resolution Accuracy

32 - 122 oF (0 - 50 oC) 0.1 oF/C 1.5 oF (0.8 oC)

Model 407114 Version 2.0 November 20054

Meter Description

1. Sensor plug. Can be inserted in the

sensor jack from only one direction.

Ensure proper orientation before

exerting force to plug in the sensor.

2. PC Interface jack (RS-232). For

use with the interface cable

provided in the optional 407001 PC

Data Acquisition kit.

3. LCD Display for Air Velocity, Air

Flow, and Temperature. Units of

measure and user alerts are also

displayed on the LCD.

4. Vane Sensor. Hold the sensor in

the flow of air to initiate a reading.

5. Protective rubber holster. Must be

removed to access the rear battery

compartment.

6. Keypad (see below)

•POWER Press to turn the

meter ON or OFF

•HOLD Press to freeze the

displayed reading. Press again

to unlock display

•C/F Press to select the unit of measure for Temperature readings

•RECORD/RECALL Used to store the highest, lowest, and average readings for

later recall. Refer to the Operation section of this manual for more details. This

button also functions as the DECIMAL point when programming.

•UNIT Press to select the unit of measure for Air Velocity. This button also

functions as the DOWN ARROW button when programming

•FLOW/VELOCITY Press to select the mode of operation. In FLOW mode, the

meter displays air volume. In VELOCITY mode, the meter displays air speed.

•RIGHT Arrow button. Used when programming.

•UP Arrow button. Used when programming.

•FLOW MODE Press to select the Normal, AVG, or 2/3 MAX Air Flow operational

mode. Refer to the Operation section of this manual for more details.

•AVG/START In the FLOW mode, press to store a reading in the AVERGGE utility.

Up to 20 readings can be averaged. Refer to the Operation section of this manual

for more details.

•ENTER/RESET Used in the Flow mode while entering the duct area. Refer to the

Operation section of this manual.

•AREA Used when manually entering the area of a duct. Refer to the Operation

section of this manual.

7. Battery compartment located on the back of the instrument. The rubber protective

jacket must be removed from the meter to access the compartment.

Model 407114 Version 2.0 November 20055

Operation

Air Velocity Measurements

1. Connect the sensor to the sensor input jack on top of the meter.

2. Turn on the meter using the POWER button.

3. Select the VELOCITY function using the VEL/FLOW button. The LCD will display VEL

when the velocity mode is selected.

4. Select the desired temperature units using the C/F select button. The LCD will reflect

the current unit selection.

5. Select the desired air velocity units using the UNIT

button. The LCD will reflect the current unit selection.

6. Place the sensor in the air current with the yellow dot

on the exhaust side of the vane (see diagram)

7. View the air velocity and temperature readings on the

LCD Display. The large main LCD display shows the

Air Velocity reading. The lower LCD sub-display shows

the temperature reading.

Data Hold Feature

1. While taking measurements, press the HOLD button to freeze the LCD reading for later

viewing.

2. The DH indicator will appear on the LCD when the display is in Data Hold mode.

3. Press HOLD again to return to normal operation.

Maximum and Minimum Recording

The 407114 allows the user to record and view the highest (MAX) and lowest (MIN)

readings.

1. Press the RECORD/RECALL button once. The REC indicator will appear on the

display and the meter will begin keeping track of the MAX and MIN values.

2. To view the MAX reading, press RECORD/RECALL again. The MAX indicator along

with the maximum reading will appear on the LCD display.

3. Press RECORD/RECALL again to view the minimum value, the MIN indicator along

with the minimum reading will appear on the LCD display.

4. To return to normal operation, press and hold the RECORD/RECALL button for

approx. 3 seconds. The display indicators REC, MAX, and MIN will disappear.

airflow

yellow

dot

Model 407114 Version 2.0 November 20056

Air Flow Measurements (CMM / CFM)

1. Connect the sensor to the sensor input jack on top of the meter.

2. Turn on the meter using the Power button.

3. Select the FLOW mode using the FLOW/VELOCITY button. The LCD will display

FLOW when the Flow function has been properly selected.

4. Select the desired air flow units: CMM (cubic meters per minute) or CFM (cubic feet

per minute) using the UNIT button. The LCD will reflect the selection.

5. Press the AREA button to begin entering the area in m2or ft2. Use the button to

increment the flashing digit, use the button to decrement the flashing digit, use the

button to select the next digit, and use the RECORD/RECALL button to set the

decimal point. Press the ENTER/RESET button when the area has been entered. The

bottom display (normally used for the temperature display) will indicate the area

entered in ft2or m2. The main LCD displays the air flow in CFM (cubic feet per minute)

or CMM (cubic meters per minute). If the CFM or CMM reading exceeds 9999, use the

displayed X10 or X100 multiplier to calculate the reading.

6. For Air Flow measurements, three modes apply: The normal (default mode) where the

actual flow is indicated, and the two modes described below: Press the FLOW/MODE

button to select one of the two modes listed below:

2/3V MAX MODE: LCD displays 2/3 the measured value.

AVG MODE: Up to 20 readings can be taken separately and averaged. Select the AVG

mode via the FLOW/MODE button and then press the AVG/START button to take a

reading. Up to 20 readings can be taken and averaged. The lower LCD display

provides a 1 to 20 counter and each time a reading is taken the counter is

incremented. The main LCD displays the averaged air flow.

7. Note that the temperature function is not active in the Air Flow mode.

Automatic Power OFF

The Model 407114 turns off automatically after 15 minutes of operation. This feature was

designed to conserve battery power. Note that when the meter is in the RECORD/RECALL

mode, the Automatic Power OFF feature is disabled.

Battery Replacement

When LBT appears on the LCD, the 9V battery must be replaced.

1. Disconnect the sensor and the RS-232 PC Interface cable from the meter.

2. Remove the meter’s rubber protective jacket

3. Use a flat blade screwdriver or a coin to open the rear battery compartment

4. Replace the 9V battery

5. Close the battery compartment and replace the meter’s protective jacket

RS-232 PC Interface

The 407114 is equipped with a 3.5mm phono jack (meter top) for connection to a PC. To

obtain the Model 407001 WindowsTM data acquisition kit, contact Extech Instruments. The

kit includes a cable that connects the meter to a PC. Instructions for use are provided with

the 407001 kit.

Model 407114 Version 2.0 November 20057



Support line (781) 890-7440

Technical support: Extension 200; E-mail: [email protected]m

Repair & Returns: Extension 210; E-mail: [email protected]

Product specifications subject to change without notice

For the latest version of this User’s Guide, Software updates, and other

up-to-the-minute product information, visit our website: www.extech.com

Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451

Warranty

EXTECH INSTRUMENTS CORPORATION warrants this instrument 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 at

(781) 890-7440 ext. 210 for authorization or visit our website www.extech.com for contact

information. A Return Authorization (RA) number must be issued before any product is

returned to Extech. 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. Extech

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.

Extech'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 and Repair Services

Extech offers repair and calibration services for the products we sell. Extech also

provides NIST certification for most products. Call the Customer Service Department for

information on calibration services available for this product. Extech recommends that

annual calibrations be performed to verify meter performance and accuracy.

Model 407114 Version 2.0 November 20058

Useful Equations and Conversions

Area equation for rectangular or square ducts

Area equation for circular ducts

Cubic equations

NOTE: Measurements made in inches

must be converted to feet or meters before using the above formulae.

Unit of Measure Conversion Table

m/s ft/min knots km/h MPH

1 m/s 1196.87 1.944 3.6 2.24

1 ft/min 0.00508 10.00987 0.01829 0.01138

1 knot 0.5144 101.27 11.8519 1.1523

1 km/h 0.2778 54.69 0.54 10.6222

1 MPH 0.4464 87.89 0.8679 1.6071 1

Width (W)

Height (H)

Area (A) = Width (W) x Height (H)

CFM (ft3/min) = Air Velocity (ft/min) x Area (ft2)

CMM (m3/min) = Air Velocity (m/sec) x Area (m2) x 60

Radius Area (A) = x r2

Where  = 3.14 and r2= radius x radius

Tabla de contenidos

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