Extech Instruments 407117 Manuel utilisateur

User's Manual

Heavy Duty Mini Vane

CFM Thermo Anemometer

Model 407117

Model 407117 -Version 2.1 -November 2005

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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 three years from date of shipment (a six month limited

warranty applies on 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 for authorization. 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.

Introduction

Congratulations on your purchase of the Extech 407117 Heavy Duty Mini Vane CFM

Thermo Anemometer. This meter uses a telescoping antenna sensor to measure Air

Velocity, Air Flow and Temperature. An RS-232 PC interface provides data acquisition

functionality. Proper use of this meter will provide years of reliable service.

Model 407117 -Version 2.1 -November 2005

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) and CFM (ft3/min);Temp: °C and °F

Data hold Freezes displayed reading

Sampling rate 1 second approx.

Sensors Air velocity/flow sensor: Low friction, ball-bearing vane;

Temp. sensor: Precision thermistor

MAX/MIN Memory Record and Recall 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 output

Operating Temperature Meter: 32 to 122°F (0 to 50°C); Sensor: 32 to 176°F (0 to 80°C)

Operating Humidity Max. 80% RH

Power Supply 9V battery (Heavy duty alkaline); optional AC adapter

Power Current Approx. DC 8.3 mA

Weight 1.6 lbs. (700 g) including battery & probe

Dimensions Main instrument: 7 x 2.9 x1.3" (178 x 74 x 33mm)

Telescoping Sensor: 0.5" diameter head;

23.6" (600mm) max antenna length with 39" (1m) cable

Air Velocity Measurements Range Resolution Accuracy %rdg

m/s (meters per sec) 0.80 – 12.00 m/s 0.01 m/s ± (2% + 0.2 m/s)

km/h (kilometers per hour) 2.8 – 43.2 km/h 0.1 km/h ± (2% + 0.8 km/h)

ft/min (feet per minute) 160 – 2358 ft/min 1 ft/min ± (2% + 40 ft/m)

mph (miles per hour) 1.8 – 26.8 mph 0.1 mph ± (2% + 0.4 mph)

knots (nautical miles per hour ) 1.6 to 23.3 knots 0.1 knots ± (2% + 0.4 knots)

Air Flow Measurements Range Resolution Area

CMM (cubic meters per minute) 0-999,900 m3/min 0.001 to 100 0 to 9,999m2

CFM (cubic feet per minute) 0-999,900 ft3/min 0.001 to 100 0 to 9,999ft2

Range Resolution Accuracy

Air Temperature 32 - 176oF (0 - 80oC) 0.1oF/C 1.5oF (0.8oC)

Model 407117 -Version 2.1 -November 2005

Meter Description

1. LCD Display

2. Keypad

3. Rubber protective holster

4. Battery compartment (rear)

5. RS-232 PC Interface jack

6. Sensor input plug

7. Telescoping antenna sensor

Note: To access the rear battery compartment

remove the meter's rubber protective holster.

Meter 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. Open the antenna to the desired length.

7. Place the sensor in the air current to be measured. Have the air flow meet the

sensor head in the direction of the word IN printed on the sensor head.

8. 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 407117 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.

Model 407117 -Version 2.1 -November 2005

Auto Power Off

To save battery life, the meter will automatically shut off after approximately 15 minutes of

operation. To disable this feature, press the RECORD/RECALL button and enter the

RECORD mode.

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 VEL/FLOW 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 SAMPLE 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 MAX/MIN 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 that increments each time a reading is taken.

The main LCD displays the averaged air flow.

7. Note that the temperature function is not active in the AIR FLOW mode.

RS-232 PC Interface

The 407117 is equipped with a 3.5mm phone jack (meter top) for connection to a PC for

data acquisition purposes. To obtain PC interface cabling and WindowsTM data acquisition

software, contact Extech Instruments. Instructions for use are provided with the optional

data acquisition software/hardware kits.

Battery Replacement

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

1. Remove the rubber holster that surrounds the entire meter

2. Slide off the rear battery compartment

3. Replace the 9V battery

4. Affix the battery compartment cover and the meter holster

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 407117 -Version 2.1 -November 2005

Useful Equations and Conversions

Area equations

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/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

Area of a circle = pi x R 2

Area of a rectangle = W x H

Table des matières

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