Extech Instruments 451126 Manuale utente

User's Guide

Vane Thermo-Anemometer Datalogger

Model 451126

Introduction

Congratulations on your purchase of Extech's Thermo-Anemometer Datalogger. This

Vane-type Anemometer can indicate Air Velocity in five units of measure: Feet per minute,

Meters per second, Miles per hour, Kilometers per hour, and Knots with Temperature

displayed in oC or oF units. The meter can also display air flow in CFM or CMM. The built-in

datalogger can record up to 2000 readings and the RS-232 interface provides PC data

transfer capability.

Model 451126 V2.0 6/08

Specifications

Display Dual 4-digit (9999 count) Multi-function LCD

Data hold Locks latest reading on the LCD display

Sensor Structure Air velocity sensor: Conventional twisted vane arm with low friction

(sapphire) ball bearing. Temperature sensor: K-type thermocouple

built into vane. 1/4" mounting nut provided

Memory Recall Records Max/Min readings with push-key RECALL

Data Output RS-232 PC serial interface

Operating conditions

(Meter) Temperature: 32°F to 122°F (0°C to 50°C); Humidity: <80% RH;

Pressure: 500mB to 2 Bar

Operating conditions

(Vane) Temperature: 32°F to 140°F (0°C to 60°C); Humidity: <80% RH;

Pressure: 500mB to 2 Bar

Storage temperature Temperature: -40°F to 140°F (-40°C to 60°C)

Power Supply 9V battery; Battery life: 50 hours typical

Power Consumption Approx. 3 mA DC

Weight 0.77 lbs. (350g)

Dimensions Meter: 3.46 x 6.61 x 1.03" (88 x 168 x 26.2mm);

Vane: 2.6 x 5.22 x 1.15" (66 x 132 x 29.2mm)

Accessories 9V battery and carrying case

Range Specifications

Air Velocity

Measurement

Calibrated Range Display

Resolution Accuracy

(%FS)

Feet per Minute (ft/min) 60.0 to 8800 0.1 ± (3% + 20 ft/min)

Meters per Second (m/s) 0.30 to 45.00 0.01 ± (3% + 0.1 m/s)

Kilometers per Hour (km/hr) 1.00 to 140.0 0.01 ± (3% + 0.4 km/hr)

Miles per Hour (mile/hr) 0.70 to 100.0 0.01 ± (3% + 0.2 mile/hr)

Knots 0.60 - 88.0 0.01 ± (3% + 0.2 knots)

Temperature

Units Range Converter Resolution Accuracy

oC 0.0oC to 45.0oC 0.2oC ±1.0oC

oF 32.0oF to 113.0oF 0.4oF ±1.8oF

Air Flow and Area

(CMM: 0 to 45.00 m/s; CFM: 0 to 8800 ft/min)

Range Resolution Area

CFM (ft3/min) 0 to 999900 0.001 to 100 0.001 to 9999

CMM (m3/min) 0 to 999900 0.001 to 100 0.001 to 9999

Model 451126 V2.0 6/08

Meter Description

1. LCD Display

2. Vane Sensor

3. ON/OFF Key

4. RS-232 Connector

5. Function/Numeric Keypad

LCD Display Icon Definitions

AVE Average reading mode

is selected

oC Temperature is displayed in degrees

centigrade

MIN Minimum reading mode

is selected

oF Temperature is displayed in degrees

Fahrenheit

2/3V 2/3V Maximum mode is

selected CFM Cubic feet per minute (ft3/min)

MAX Maximum reading

mode is selected CMM Cubic meters per minute (m3/min)

VEL Air Velocity

measurement x100 Multiply reading by one hundred

READ Recalling stored

measurements X10 Multiply reading by ten

REC Appears when

recording readings m/s Meters per second

RS-232 PC Interface is

activated ft/min Feet per minute

ft2Square feet MPH Miles per hour

m2Square meters Km/h Kilometers per hour

Model 451126 V2.0 6/08

Operation

NOTE: For all air velocity or flow measurements, the air should pass through the vane

from back to front. The rear of the vane can be found by locating the mounting nut. The

front of the vane has the engraving "ANEMOMETER". For more accurate results, maintain

a 20oaxis of air direction with the rear of the vane (refer to Fig.2).

Air Velocity

1. Power the meter by pressing .

2. Select Air Velocity measurement

function by pressing . VEL will

appear on the LCD.

3. Press to select the desired unit

of measure (ft/min, mph, km/h, m/s or

knots)

4. Place the vane in the air flow with the

air direction matching the direction of

the arrows printed on the inner walls

of the vane. If the unit does not have the printed arrows, have the tripod mount side

of the vane facing the air flow (see Fig.2).

5. Air velocity will be displayed on the bottom line of the LCD.

Temperature

1. When the meter is measuring Air Velocity, Temperature is simultaneously being

measured by the vane's built-in type-K thermocouple.

2. Press to select °C or °F. Temperature is displayed on the upper line of the

LCD.

Air Flow

1. Power the meter by pressing .

2. Press to select airflow. FLOW will display.

3. Press to select the desired unit of measure. (CFM, CMM).

4. To enter the area value, press . The lower display line will blank waiting for

the user to program new data. Use the numeric keys to enter a new area value in

square feet. (REMINDER: if measurement is taken in inches, divide by 144 to

obtain square feet). Press when finished.

Airflow is based on the specific dimensions of the duct being measured. For the

meter to correctly measure CFM the user must input the area of the duct. Failing to

input the correct area dimensions will result in erroneous readings.

NOTE: If the AVE or the 2/3MAX display icons are displayed in the upper left hand

corner of the LCD, press until they extinguish.

5. Place the vane in the air flow (Fig.2).

6. Wait approximately 2 seconds for a stabilized Air Flow reading.

7. The equation below is used to calculate Air Flow:

AIR FLOW = (AIR VELOCITY) x (AREA)

Side view

of Vane

Tripod mount

Air directio

Figure 2

Model 451126 V2.0 6/08

2/3Vmax Air Flow

1. Power the meter by pressing .

2. Press to select Air Flow. FLOW will display.

3. Press to select the desired units (CFM, CMM).

4. The previously stored area value will be displayed on the upper LCD display line.

To enter a new area value press . The lower display line will blank waiting for

the user to program new data. Use the numeric keys to enter a new area value in

square feet. Press when finished.

5. Press until the 2/3V MAX icon appears on the LCD.

6. Determine the direction of the air to be measured. Move the Vane around the

center of the area being measured to read the maximum air velocity. The meter will

use the maximum reading obtained to determine the 2/3MAX Air Flow.

Average Air Flow

1. Power the meter by pressing .

2. Press to select Air Flow. FLOW will display.

3. Press to select the desired units (CFM, CMM).

4. The previously stored area value will be displayed on the upper LCD display line.

To enter a new area value press . The lower display line will blank waiting for

the user to program new data. Use the numeric keys to enter a new area value.

Press when finished.

5. Press until AVE appears on the LCD display.

6. Press to clear the upper LCD.

7. Select a measurement location. Once a point is selected and a flow measurement

is displayed, press to average the flow reading.

8. Select the next measurement location and press again to average the

reading with previous readings. The value in the upper LCD line will increment for

each reading taken to show how many readings were averaged. The max is 12

readings.

Data Hold

Press to freeze the reading. The display will hold and an 'H' will appear on the LCD.

Press again to return to normal operation.

MAX and MIN Measurements

1. Press to enter MAX mode. The meter will only display the highest reading.

2. Press again to enter the MIN. The meter will only display the lowest reading.

3. Press to exit the MAX or the MIN mode.

Model 451126 V2.0 6/08

Datalogging

Instantaneous (One-Shot) Datalogging

To record one data point at any desired time, set the sampling rate = 0 by pressing

in the VEL mode. The previously stored reading will be displayed on the upper LCD line.

Enter a '0' sampling time and then press . Now, each time is pressed, the

present reading will be stored in non-volatile memory.

Automatic Datalogging

1. Set the Sampling rate for datalogging by pressing . The previous sample

rate will appear.

2. Enter a value from 1 to 240 seconds using the numeric keypad. Press when

done.

3. Press to begin storing readings in non-volatile memory every n seconds (n =

the value entered in step 2. above).

4. The REC icon will appear on the LCD indicating that the datalogging mode is

activated.

5. The maximum number of readings that can be stored is 2000.

6. To stop datalogging, press again. The datalogger will automatically stop

recording data when 2000 records have been stored.

See software section of this manual for instruction on viewing logged data.

IMPORTANT NOTE: If power is removed before datalogging is properly halted,

data will be lost.

Reading Stored Data Sequentially

Press , the RECORD NUMBER will briefly display on the upper LCD line before

the measurement data appears. Press to return to normal operation.

Reading Stored Data Randomly

1. Press to enter the READ mode.

2. Press and enter the number of the record in question.

3. Press again and the desired data will be displayed.

4. Press to return to normal operation.

Clearing Datalog Memory

Press and hold while powering up the meter to clear the meter's datalog

memory.

Model 451126 V2.0 6/08

Software Requirements and Installation

The 451126 software lets the user:

•Download logged recordings from the meter’s memory

•Record to the PC

•Graphically display readings from the meter

System Requirements

Hardware Requirements: PC recommended with processor of Pentium III 600MHz or

above.

RAM: Recommended 512MB of RAM or more

Screen Resolution: requires 1,024 x 768 pixels.

451126 Anemometer

Operating System Compatibility: WindowsTM 95/98/NT/2000/XP/VISTA

Hardware Connection

The meter connects to a PC with the supplied DB-9 to DB-9 interface cable. The meter

can also be used with a Serial to USB Adaptor. NOTE: The driver that comes with the

adaptor should be installed in order to connect via USB. Please follow the instructions

that came with your adaptor.

Software Installation

Load the software CD in the PC CD-ROM drive. Close any open programs. Click on

SETUP and the following windows will appear directing the user through the install:

Model 451126 V2.0 6/08

1. 4.

Click “Next”

2. 5.

Click “Next”

3. 6.

Click “I accept” Reboot PC

NOTES: The meter is supplied with a 9 pin DB9 RS232 cable. In order to establish

communication with the meter the correct COM PORT must be selected in the 451126

Software. To find out what COM PORTS are available go to Windows Device

Manager>Ports. It is here the COM PORTS will be listed.

If using the meter with a Serial to USB Adaptor make sure you install the driver that is

supplied with the 3rd party adaptor. Once this is done ,check under Windows Device

Manager>Ports and make sure that the brand name of the Serial to USB Adaptor is

listed here. Note what COM PORT it has assigned. Make sure that in the 451126

Software you select the COM PORT it is assigned to in order to establish

communication.

Model 451126 V2.0 6/08

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/hr 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/hr 0.2778 54.69 0.54 10.6222

1 mph 0.4464 87.89 0.8679 1.6071 1

Area = W x H

Rectangular Duct Circular Duct

πR2

(A= 3.14 x R x R)

Support line (781) 890-7440

Technical Support: Extension 200; E-mail: supp[email protected]

Repair & Returns: Extension 210; E-mail: repair@extech.com

Product specifications subject to change without notice

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

the

minute product information, visit our website:

www.extech.com

Battery Replacement

The low battery indicator appears on the LCD display when it is time to replace the 9V

battery, which powers the meter.

To replace the battery:

a. Turn the meter off.

b. Remove the battery compartment screw and remove the battery compartment

cover.

c. Replace the 9V battery and reinstall the compartment cover.

d. Fasten the compartment screw

Warranty

EXTECH INSTRUMENTS CORPORATION (A FLIR COMPANY) 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 Care Department for

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

annual calibrations be performed to verify meter performance and accuracy.

more info for Extech 451126

Phone: 01235 838 555

Email: cs@airconcern.co.uk

Web: www.airconcern.co.uk

Air Concern Ltd, Building 173 Curie Avenue Harwell Didcot, Oxfordshire

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