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Wind Flow Calculate Formula: Flow =velocity *(Free Area)
Testing Wind velocity : The Bar graphic (showing on the middle of
LCD )was subject to the increasing wind Flow/ Velocity
Note:
a without enter the duct area will lead to failing in taking
measurement of the wind flow.
If wind flow is larger than 9999, the LCD screen will show x10 or x100, and the
measured value is also x10 or x100.
Measurement of 2/3 V max Wind Flow
Press the “VEL/FLOW” key to entre "FLOW" mode, the LCD screen
shows in figure 7:
Figure 7
Select your desired unit by pressing the “UNIT” key, for example: select
CMM for wind flow unit, “M
2
” for area unit ,at this time the LCD screen
shows as above diagram.
Press the "AREA " key, Letter on the LCD will disappeared at this time
you can input duct area, such as 1.2, press “ENTER” key confirm press
again the “OPTION” key to select “2/3 V max”, here the LCD screen as
shown in figure 8
Figure 8
Aim the vane of the attached unit at duct area properly, take
measurement of 2/3 V max wind flow right away, press again the
“OPTION” key exit to measurement of 2/3 V max wind flow.
2/3 Max Wind flow calculate formula: FLOW =2/3×Max wind Velocity
×duct Area.
MEASUREMENT OF AVERAGE WIND FLOW
Press the “VEL/FLOW” key to get into “FLOW” mode, the LCD screen
shows as in figure 9:
Figure 9
Select your desired unit by pressing the “UNIT” key, for example: select
CMM for wind flow unit, “M2” for area unit, at this time the LCD screen
shows as above diagram
Press the “AREA” key, you can input duct area. such as 1.2, press the
“OPTION” key to select “AVERAGE”, the LCD shows as in figure10:
Figure10
Aim the vane at certain point of duct area properly, press the “NEXT” key,
on the right bottom of the LCD will show serial number, in the meantime
you can take measurement of the first group wind flow values. As shown
in figure 11:
Figure 11
Then select another test point, press the “NEXT” key to take
measurement of the second group average wind flow values. Repeat
above steps to measure as many as 12 groups average wind flow
values. As shown in figure 12:
Figure 12
Once again press the "OPTION key exit to measurement of average
wind flow.
Average Wind flow calculate formula
Flow =l/N ∑(Velocity)×(free Area)
Note
The average value only displays by pressing NEXT key , If there is
wind in the duct area, then the LCD Screen will shows the measured
Average Wind flow.
Max and min measurement .
In wind flow and velocity measuring process, press the “MAX/MIN” key
to obtain the maximum and minimum values, press again to exit. For
example:
(1) When measuring maximum value of wind velocity, a “MAX” will
be shown on the upper LCD screen, as shown in figure 13
Figure 13
(2) When measuring minimum value of wind velocity, a “MIN” will be
shown on the upper LCD screen, as shown in figure 14:
Note: Figure 14
Operation of Max/Min wind flow measurement is the same as wind velocity.
Date holding /Storage/Reading and clearing
Data holding:
on Measurement state, press the "HOLD" key to freeze the Data , press
the "HOLD' key again return to normal operation.
Data storage:
(1) instantaneous (one-shot) data storage: on Measurement state,
set the sampling rate=0 by pressing “SAMPLE” key and in put a
"0" sampling time and then press "ENTER". Now, each time
"REC" is pressed, the present reading will be stored.
(2) Automatic data storage: on Measurement state, press the
“SAMPLE” key and input sampling rate, (the sampling rate from
1-99 seconds using the numeric keys to enter your desire rate,)
then press the “ENTER” key to confirm. Press the “REC” key to
begin storing readings in every sampling rate. The “REC” icon will
appear on the LCD indicated the data storage function is
activated. Press again the “REC” key to finish data storage.
（Press “REC” Key stop recording.）
(3) hold the "CLR "button two seconds, and the screen shows
"CLR", all the records will be cleared
Reading data stored sequentially:
(1) Press the “READ” key, you can read the stored data in memory
sequentially, the LCD will first shows serial number then shows the
data. Short Press “RESET” key to return normal operation. In data
read, read to 10 if you need testing, once again return to read the
state, the data will be then 10 to read ( This product can store 600
set of data. When the storage area full, the "full" appeared, Press
the "RESET" button back to measurement state ）As shown in
figure 15:
(2) read the value random
In "READ" state, press the "SAMPLE" button to enter the data read
serial number .Then press "ENTER" confirmed that can show,
press the "RESET" button to exit
stored store Figure 15
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