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 Version 1.6 February 2004

Specifications

General 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

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 Version 1.6 February 2004

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 Version 1.6 February 2004

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 Version 1.6 February 2004

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 Version 1.6 February 2004

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 Version 1.6 February 2004

Software

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: 486 PC or better with COM 1 and COM 2 Serial ports

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

Hardware Connection

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

Software Installation

The instructions on how to install the optional software are printed on the Software CD

label. After reading the label’s directions, load the software CD in the PC CD-ROM drive.

Model 451126 Version 1.6 February 2004

Starting the Software

1. Run the program by opening the program named “Flow

Anemometer”.

Flow Anemometer is in the programs folder of your

Windows software.

2. Wait for the program to initialize and select COM 1 or 2

as required.

The program will load and the main display will appear.

A red NO COM icon will flash on the bottom right hand

side of the display.

3. Press and hold then power on the meter by

pressing

The RS232 icon will appear on the upper right hand side

display of the meter.

The NO COM icon will disappear.

Communications has been established.

Values will appear in the diplay.

Model 451126 Version 1.6 February 2004

Operating the Software

Graphical Display Mode

The display command offers 5 different displays.

Click Display on menu bar to select.

Click Option to set Upper and Lower Limits. The software will then flag readings exceeding

the limits.

Main Display Digital Display

Click Reset button on main

display to clear Min/Max

Analog Display Graphical Display

Click Scale in Graphical Mode

to change x and y axis scale.

List Display

Model 451126 Version 1.6 February 2004

Data Acquisition Mode

In data acquisition mode the meter is connected to a PC with the data being saved

directly to the PC’s memory.

1. In the Flow Anemometer

program, click File, and then

click Name. Enter a file name

and click OK

2. Click Option then Sample,

enter a sampling interval and

then click OK

3. Click File then Start

Recording.

4. To stop the meter click File

then click End Recording.

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