Extech Instruments 451104 User manual

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 [phone] 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.
Copyright ©2003 Extech Instruments Corporation.
All rights reserved including the right of reproduction in whole or in part in any form.
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

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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.

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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.

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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.