Extech Instruments 451104 Manuale utente

1 451104 4/03 Ver. 1.4

User’s Manual

Vane Anemometer

MODEL 451104

2 451104 4/03 Ver. 1.4

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 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 ext. 210 for authorization or visit

our website at www.extech.com (click on ‘Contact Extech’ and go to ‘Service

Department’ to request an RA number). 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 complete repair and calibration services for all of the products we sell.

For periodic calibration, NIST certification or repair of any Extech product, call

customer service for details on services available. Extech recommends that

calibration be performed on an annual basis to insure calibration integrity.

3 451104 4/03 Ver. 1.4

Introduction

Congratulations on your purchase of Extech's Vane Anemometer, Model 451104.

The Model 451104, measures the speed (velocity) at which air is flowing. It also

measures temperature in both Centigrade and Fahrenheit. Careful use of this meter

will provide years of safe, reliable service.

Specifications

General Specifications

Display 4 digit LCD display (0 to 9999 display counts)

Operating Temperature 14 °F to 122 °F (-10 °C to 50 °C)

Operating Humidity 80% RH max.

Meter Power DC 9V; 100 hours continuous battery life

(20 minute automatic power OFF conserves energy)

Weight 1.5 lb (680g)

Dimensions 7.2 x 3.0 x 1.8” (183 x 76 x 45 mm)

Sensor Diameter 3” (70mm)

Accessories 9V battery, hard carry case, and Instruction manual

Range Specifications

Range Resolution Accuracy (%FS)

80 - 5900 ft/min 1

0.4 - 30 m/sec 0.01

0.9 - 68 mph

0.8 - 58 knots

1.4 - 108 km/hr

0.1

± 3%

-10 to 50oC ± 1Co

14 to 122oF

0.1o

± 2Fo

Meter Description

1. Air velocity sensor and Temperature sensor

2. Data Hold key

3. Min/Max Record key

4. On/Off Reset key

5. Units select

6. Set-up key

7. LCD air velocity display

8. LCD temperature display

9. RS232 PC port

4 451104 4/03 Ver. 1.4

Operating Instructions

Power

Press the ON/OFF key to turn the meter on. The LCD will illuminate all display

indicators for approximately 2 seconds as it initializes. The meter will display "Vel" in

the upper left hand corner of the LCD when it is ready for use.

Selecting Measurement Ranges

To select a measurement range, press the UNITS key. The meter defaults to the

ft/min mode. Press the UNITS key until the desired range appears on the LCD [mi/h

(mph), knots (km/hr)].

Measurement modes

Standard Measurement Mode

This is the default mode in which the meter powers up. Measurements will appear

for air velocity and temperature on the LCD as they are measured. Other measuring

modes are discussed next.

Continuous Running Average Measurement Mode

This Anemometer has the ability to record data for up to 2 hours while displaying the

"running" average. Power the unit, place the vane sensor in front of the air source to

be measured, press the RECORD key, and the meter will begin displaying the

running average. Data is recorded once per second, and the user has up to 2 hours

before the meter memory is full.

MIN/MAX/AVG Measurement Mode

To measure the minimum, maximum, and average readings in a given period of time

perform the following steps:

1. Power the unit

2. Place the sensor in front of the air source

3. Press the RECORD key. The meter begins to record readings

4. Press the HOLD button BEFORE moving the sensor away from air source

5. Press the RECORD key once to display the reading that was on the LCD at

the time the HOLD button was pressed

6. Press RECORD again to display MIN reading

7. Press RECORD a third time to display the MAX reading.

8. Press RECORD a fourth time to display the AVG reading

9. To clear all four of these stored readings, remove power from the meter or

press and Hold RECORD until the meter beeps twice.

5 451104 4/03 Ver. 1.4

AUTO-POWER OFF (SLEEP MODE)

This meter is equipped with an automatic shut-off function. After 20 minutes the meter

automatically turns off (after sounding three warning beeps). Press the ON key while the

warning beeps are sounding to provide another 20 minute window. To defeat the Auto

Power Off feature, refer to the next section.

Disabling the Auto-Power OFF Feature

1. Remove power from meter.

2. Press and hold the "ON" and "Hold" keys simultaneously.

3. Release the "ON" key while continuing to press the "Hold" key.

4. An "n" will appear on the LCD indicating "non-Sleep Mode".

5. Release the "Hold" key

6. The unit's Auto-Power OFF feature has been defeated meaning that it will not

power down until the user powers down deliberately by pressing OFF button.

7. Auto Power OFF will be re-activated the next time the meter is powered.

CHANGING THE DEFAULT SETTINGS

It is possible to change the default air velocity and temperature display units and

RS232 baud rate. The default air velocity units are ft/min and the default

temperature units are degrees F. To change the default units to m/sec for air

velocity and degrees C for temperature, perform the following steps:

1. From a power down condition, press and hold the "SET-UP" key.

2. Press and release the "ON" key and at the second beep release the "SET-UP"

key.

3. The LCD will indicate Air Velocity units in the upper right hand corner and

temperature units in the right lower corner.

4. Press the "Hold" key to set the Air Velocity units to m/sec (and deg. C) or the

"SET-UP" key to set the Air Velocity units to ft/min (and deg. F).

5. Press the "RECORD" key and an "S" will appear on the meter's LCD.

6. Press the "HOLD" key to save the setting.

7. "1200" or "2400" will appear on the LCD. This is the RS232 baud rate.

8. Press the "HOLD" key to set 1200 or the "SET-UP" key to set 2400.

9. Press the "RECORD" key and an "S" will appear on the meter's LCD.

10.Press the "HOLD" key to save the setting and return to the normal operating

mode.

6 451104 4/03 Ver. 1.4

RS232 OPERATION

The meter will communicate with a PC via WindowsTM Hyperterminal.

1 Connect the RS232 cable from the meter jack to the PC COM port

2 Set the PC COM port settings to: Baud rate:2400, Data bits:8, Parity: none,

Stop bits: 1, Flow control: None or Xon/Xoff

3 Run the Hyperterminal program (supplied with most versions of WindowsTM

Operating Systems).

4 Data format:

T026.1C:V00.00MS or T078.2F:V00:00FTM

Where TXXX.X is the temperature in C or F and VXX:XX is the air velocity in

M/sec or Ft/min.

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