3
(2)
Press button
℃
/
℉
to Switch
℃
/
℉
or (number 6
key).
Note:
a
If current is in wind flow measuring mode (on the left
top of the LCD will show "FLOW", you can turn it into
wind velocity measuring mode by pressing the
"VEL/FLOW' key, vice versa.
b
The defaulted model is last time you has setting
Measurement of Wind flow
Press the “VEL/FLOW” key to get into “FLOW” mode at this
time the LCD screen as shown in figure 4 :
Figure 4
(if the area value has been set before the last setting will be
shown)
Select your desired unit of wind flow and duct area:
a
Press the “UNIT” key, the wind flow unit will convert
between CMM and CFM
b
Press the “UNIT” key, the area unit will convert
between “M
2
” and “FT
2
”.
c
Area unit: "M
2
" and "FT
2
" will convert according with
the conversion of the wind flow unit.
If wind flow unit is CMM, the area unit will be “M
2
”;
If wind flow unit is CFM. the area unit will be “FT
2
”.
Press the “AREA” key, the numbers in the middle of the
LCD will be disappeared at this time press numeric keys to
enter a new duct area, such as1.2, then press the “ENTER”
key to confirm. At this time the LCD screen as shown in
figure5:
Figure 5
Place the vane in the duct area, take measurement of
current wind flow value right away. As shown in figure 6 :
Figure 6
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: 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 figure7:
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”, 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 “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, In the LCD of the upper part of the 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:
