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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. 

Summary of Contents for 451126

Page 1: ...ype 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 o C or o F units The mete...

Page 2: ...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 Acc...

Page 3: ...is displayed in degrees Fahrenheit 2 3V 2 3V Maximum mode is selected CFM Cubic feet per minute ft 3 min MAX Maximum reading mode is selected CMM Cubic meters per minute m 3 min VEL Air Velocity measu...

Page 4: ...y 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 airf...

Page 5: ...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 nu...

Page 6: ...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 recordin...

Page 7: ...4 x 768 pixels 451126 Anemometer Operating System Compatibility Windows TM 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 mete...

Page 8: ...le 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 3 rd party adap...

Page 9: ...3 min Air Velocity m sec x Area m 2 x 60 Units Conversion Table m s ft min knots km hr mph 1 m s 1 196 87 1 944 3 6 2 24 1 ft min 0 00508 1 0 00987 0 01829 0 01138 1 knot 0 5144 101 27 1 1 8519 1 152...

Page 10: ...ore 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 resulti...

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