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VF-5200 series Air Velocity/Flow/Differential Manometer
Instruction Manual
VF-5204 (Low Pressure Type) : 0 ~ ±70mbar
VF-5205 (High Pressure Type) : 0 ~ ±1000mbar
VF-5204+(Low Air Velocity/Flow/Differential Manometer) : Air Velocity 0 ~ 100m/s, Air flow is listed the below table
VF-5205+(High Air Velocity/Flow/Differential Manometer) : Air Velocity 0 ~ 400m/s, Air flow is listed the below table
A. Specifications
Model No.
VF-5204 / VF-5204+
VF-5205 / VF-5205+
Measuring Range
Please refer the following table A.
Resolution
Area : 00.01ft²/0.001m² Air Flow : 1CFM/1CMM
Temperature : 0.1°C (0.1°F)
Air Velocity : 0.1m/s、1FPM、0.01Km/h、0.01Knots、0.01MPH
Differential Pressure : 1Pa、± 0.0001PSI、± 0.01mbar、0.0001bar、
0.01mmH2O、0.001inH2O、0.001mmHg、0.0001inHg
Area : 00.01ft²/0.001m² Air Flow : 1CFM/1CMM
Temperature : 0.1°C (0.1°F)
Air Velocity : 0.1m/s、1FPM、0.1Km/h、0.1Knots、0.1MPH
Differential Pressure : 10Pa、±0.001PSI、± 0.1mbar、0.001bar、
1mmH2O、0.1inH2O、0.1mmHg、0.001inHg
Accuracy (at 25°C)
±0.25% F.S、TEB<1% ※TEB : Total Error Band
Area Setting
Max. 9.289m² / 99.99ft² (For Air Flow measurement)
Measurement Unit
Area : ft²、m² Temperature : °C、°F Air Flow : CFM、CMM (VF-5204+ / VF-5205+)
Air Velocity : m/s、FPM(ft/min)、Km/h、Knots、MPH (VF-5204+ / VF-5205+)
Differential Pressure : Pa、PSI、mbar、bar、mmH2O、inH2O、mmHg、inHg
Media Compatibility
Dry air or non-corrosive gases and liquids
Display
Digital LCD display : Differential Pressure、Air Velocity、Air Flow、Temp.、Measurement Unit
Sampling Rate
Approx. 0.5 sec.
Output Signal
Digital Output : RS-232 / Modbus RTU protocol
(Differential Pressure、Air Flow、Air Velocity, Temp.、Max.、Min.、Avg. simultaneously)
Temp. compensation
0 ~ +60°C (+32°F ~ +140°F)
Main Functions
IP65 water and dust proof, Air Flow/Air Velocity/Wind Pressure measurements,
Fine ZERO & SPAN adjustments, ZERO setting, Max./Min./Avg. values, Data hold, Switchable °C/°F,
USB/RS-232 output, LED back-light, Auto/Manual shutdown, Fine Area adjustment
Baud Rate
57600
Operating Environment
-10 ~ +60°C (+14 ~ 140°F), 0~95%RH non-condensing
Power Supply
One 9 V battery or AC Adaptor (option)
Dimensions
150(L) × 75(W) × 28(D)mm (5.91 × 2.96 × 1.11 inches), Not including the pressure hose connector
Weight
Approx. 250g (including the battery)
Approvals
RoHS, CE, IP65
Standard Accessories
Instrument (VF-5204 or VF-5205)、Paper box、Battery、Pouch case、Operation manual
+
Plus Accessories
Instrument (VF-5204+ or VF-5205+)、Pitot tube (Φ8 x 300mm, specifications can be customized)、Silicon
tube (1M, length can be specified)、Battery、Plastic carrying case、Operation manual
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※When you connect with the Pitot tube to measure the Air Velocity, The Min. Reading is:
VF-5204 (Low Pressure) : 1.2m/s = 236FPM = 4.32Km/h = 2.33Knots = 2.68MPH
VF-5205 (High Pressure) : 4.0m/s = 780FPM = 14.4Km/h = 7.7Knots = 8.9MPH
Measurement Range (Table A)
B. Instrument Description
○
1
LCD display ○8 AC Adaptor input
○
2
Data Hold and Function buttons ○9 USB output
○
3
Save/confirm and Measurement Unit buttons ○10 RS-232 output
○
4
Adjustment button ○11 Pressure terminal (+) (○12connect with atmosphere)
○
5
Adjustment button ○12 Pressure terminal (-) (○11connect with atmosphere)
○
6
Model number and serial number ○13 Power on/off
○
7
Battery cover
※To keep the instrument functions steadily, please avoid dropping, impacting or disassembling.
Model No.
Air Velocity (via Pitot tube)
Air Flow
Temperature
m/s
FPM(ft/min)
Km/h
Knots
MPH
CFM
CMM
℃
℉
VF-5204+
105
20,670
378
204.10
234.90
2,066,793
58,525
0~+60
+32~140
VF-5205+
400
78,730
1,440
777.60
894.80
3,276,000
227,300
Model No.
Pressure (Differential Pressure)
mbar
Pa
PSI
Bar
mmH2O
inH2O
mmHg
inHg
Max. Pressure
VF-5204
70
7,000
1.00
0.07
714
28.07
52.50
2.07
12.60PSI
VF-5205
1,000
100,000
14.50
1.00
10,200
401.50
750.00
29.53
21.75PSI
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C. Display Description
※MMA is MAX、MIN、AVG.
Display
Description
Battery power indicator
Manual shutdown indicator (on the manual shutdown mode)
Data hold indicator
Differential Pressure indicator (on the differential pressure measurement mode)
Air Velocity indicator (on the air velocity measurement mode)
Air Flow indicator (on the air flow measurement mode)
Adjustment/Calibration indicator (on the adjustment/calibration mode)
Setup mode indicator (on the any setting)
Units of measure for Air Velocity and Air Flow；
Including m/s、ft/min、Km/h 、Knots、MPH、CFM、CMM。
Units of measure for Pressure；Including Pa、PSI、mbar、bar、mmH2O、inH2O、mmHg、inHg。
When the reading magnification has been set, the Magnification indicator is shows.
(multiply setting’s magnification by displayed value)
Region A
Measurement display：Measurement value、Magnification value
Measurement display：unit (for setting the unit of measurement value)
Region B
Measurement display：Area value、Temperature value、MMA value
Measurement display：unit (for setting the unit of temperature)
Maximum value indicator
Minimum value indicator
Average value indicator
Magnification indicator, Measurement value and MMA value x 100 (V=v x 100)
Area unit indicator；Including m2、ft²
Temperature unit indicator；Including℃、℉
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D. Key Description ※When you turn off the instrument and start again, it will revolve to the initial setting.
Key
Function
Description
LCD display
Save (Confirm)
Press the button to complete the all of setting, and turn to measurement mode.
Unit Setting
1、On the measurement mode, press the and button and hold 3 second, release
the and when “-unit” shows, enter the setting mode for differential pressure, air
velocity and air flow.
2、On the measurement mode, press the and button and hold 3 second, release
the and when “unit” shows, enter the setting mode for temperature and area.
※Entering the above setting mode, press the or to change the unit.
※Selected unit symbol will twinkle.
※Press the to save the selected unit, and turn back to measurement mode.
Data Hold
On the measurement mode, press the button to enter the data hold mode.
※On the hold mode, press to gain measurement period’s MAX./MIN./AVG. value.
※Press the to leave the hold mode, and turn back to measurement mode.
Measurement
Function
Selection
On the measurement mode, press the and button and hold 3 second, release the
and when “-Func” shows, enter the measurement function selection mode.
※On this mode, press or to change the measurement function.
※Selected measurement function symbol(D.P、VEL、FLOW) will twinkle.
※Press to save selected measurement function, and turn back to measurement mode.
Magnification
Setting
On the measurement mode, press the and button and hold 3 second, release the
and when “100.00%” shows, enter the magnification setting mode.
※Press or to increase or decrease the data, press the and
Simultaneously to change the number of digits.
※SET symbol will twinkle.
※Press to save selected magnification setting, and turn back to measurement mode.
Back-light
On the measurement mode, press and simultaneously to start or shut back light.
※The back light will be shut down automatically after 30 second.
※Please note that the backlight cannot be operated in the mode of measurement function
selection, unit selection, data hold, duct area setting and magnification setting.
----
Adjustment
(Selection)
On the mode of measuring function selection, unit selection, data hold, duct area setting
and magnification setting, this button can adjust, select or change the setting or data.
----
Power
(Turn on/off)
1、 Turn on(automatic shutdown mode): On power off condition, press to power on.
※The instrument will be shut down automatically if there is no operation for 8 minutes.
2、 Turn on(manual shutdown mode): On power off condition, press the and hold,
then press the , LCD will shows the , unloose the and to power on.
※The instrument will not be shut down automatically on this mode.
3、 Turn off: On any mode, Press the and hold one second, LCD will shows “OFF”,
unloose the , power off.
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Fine-
Adjustment
/ Zeroing
On the power off condition, press the and hold, then press the , the will
twinkle, unloose the and to enter the adjustment/zeroing mode.
※On this mode, press or to increase or decrease the data.
※Press to save selected unit, and turn back to measurement mode.
※Please be note that the adjusted data or changed data will not be reset for turn off.
E. Operating Instructions ※Refer the “D. Key Description”
※When you turn off the instrument and start again, it will revolve to the initial setting except of adjusted and changed data.
The functions can be operated in measurement mode as follows :
E-1 Turn on / Turn off : Please refer the“D. Key Description – Power (Turn on / off)”.
E-2 Measurement function setting : Please refer the“D. Key Description – Measurement Function Selection”.
This instrument has the measuring function of the air velocity (VEL), air flow (FLOW) and differential pressure (D.P).
This three measuring function can be switched by button.
E-3 Unit setting mode : Please refer the“D. Key Description – Unit Setting”.
The selected unit will twinkle.
E-3-1 Unit setting of differential pressure, air velocity and air flow :
The units can be set as follows :
E-4 Air flow measurement mode (area setting) :
E-4-1 Air flow measurement mode setting :
On the measurement mode, press the and hold 3 second, release the and when “-Func” shows, enter the
measurement function selection mode.
On this mode, press the or to choose the FLOW measurement mode, the FLOW symbol will twinkle, press the to
save the setting, enter the flow measurement mode.
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E-4-2 Duct area setting and flow calculation :
Area setting : On the flow measurement mode, the flow unit (CMM or CFM) will be hinted, the B area’s value on the display
will be changed from temperature value to area value. Press the or to increase or decrease the data, press the to
change the number of digits. The selected digit number will twinkle, it will be stopped after 5 second. Press the , or
will twinkle again.
Flow calculation : On the air flow measurement mode, you can set up the pipe cross section previously or set up it during
measuring. The measured air flow value will be displayed automatically on the A area's.
※Initial area is 00.01 ft2 , Maximum is 99.99 ft2 , Minimum is 00.01 ft2 【Remark】1m2 = 0.0929ft2
[Example]
E-5 Hold mode :
On the measurement mode, press the to hold measurement value, will be displayed on the screen.
On this mode, press the or to gain measurement period’s MAX./MIN./AVG. value. (in the B area.)
E-5-1 Leave the hold mode :
Press the to leave the hold mode, and turn back to measurement mode.
[Example]
E-6 Magnification mode : Please refer the“D. Key Description – Magnification Setting”.
When the measurement value is exceeded, the magnification must be set to get the correct value.
On the magnification mode, press the or to adjust the data, press the and simultaneously to set the number of
digits, press the to turn back to measurement mode.
【Remark】Initial magnification value is 100.00% , Maximum is 200.00% , Minimum is 0.01%.
Selected digit number will twinkle.
E-7 Fine-Adjustment / Zeroing : Please refer the“D. Key Description – Fine-Adjustment / Zeroing”.
Please be note that the adjusted data or changed data will not be reset for turn off.
【Remark】On the fine-adjustment and zeroing operating , please use the calibrator or contact your local distributor to avoid
instruments deviation or damage.
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F. RS-232 transfer protocol
RS-232 the transmission end is one way transfer via the three wires (touch ground) to input and output.
Using the original transmission line or cable under 10m is recommended.
Baud rate: 57600
Transfer status: / 8 / N / 1
Transfer content: (8BIT)
Read Holding Registers by Function 03H
F-1 Request Data Frame
Read the pressure, temperature and parameter.
Slave
address
Function
Starting
address
Hi
Starting
address
Lo
No. of Byte
Hi
No. of Byte
Lo
CRC
Lo
CRC
Hi
11H
03H
00H
00H
00H
06H
C7H
58H
F-2 Response Data Frame
Response value = 11-Byte (includes the position command CRC)
Slave address
Function
Byte count
Data-Pre【15:8】
Data-Pre 【7:0】
11H
03H
06H
01H
2CH
Data-Tem【15:8】
Data-Tem【7:0】
Data-Par【15:8】
Data-Par【7:0】
CRC Lo
CRC Hi
00H
FAH
00H
00H(10H)
5CH
93H
Data-Pre【15:0】is A value 0 x 012C = 300 (the real value needs to refer the parameter)
Data-Tem【15:0】is B value 0 x 00FA = 250 (the real value needs to refer the parameter)(no any function in “FLOW” unit)
【3:0】is considered as low pressure and wind pressure
>>>> 0000 is pa (the real value is 300) >>>> 0100 is mmH2O (the real value is 30.0)
>>>> 0001 is PSI (the real value is 0.0300) >>>> 0101 is inH2O (the real value is 0.300)
>>>> 0010 is mbar (the real value is 3.00) >>>> 0110 is mmHg (the real value is 3.00)
>>>> 0011 is bar (the real value is 0.0300) >>>> 0111 is inHg (the real value is 0.0300)
>>>> 1000 is m/s (the real value is 30.0) >>>> 1100 is MPH (the real value is 3.00)
>>>> 1001 is ft/min (the real value is 300) >>>> 1101 is CMM (the real value is 300)
>>>> 1010 is km/h (the real value is 30.0) >>>> 1110 is CFM (the real value is 300)
>>>> 1011 is knots (the real value is 3.00)
【3:0】is considered as high pressure and wind pressure
>>>> 0000 is pa (the real value is 30.0) >>>> 0100 is mmH2O (the real value is 300)
>>>> 0001 is PSI (the real value is 0.300) >>>> 0101 is inH2O (the real value is 30.0)
>>>> 0010 is mbar (the real value is 30.0) >>>> 0110 is mmHg (the real value is 30.0)
>>>> 0011 is bar (the real value is 0.300) >>>> 0111 is inHg (the real value is 0.300)
>>>> 1000 is m/s (the real value is 30.0) >>>> 1100 is MPH (the real value is 30.0)
>>>> 1001 is ft/min (the real value is 30.0) >>>> 1101 is CMM (the real value is 300)
>>>> 1010 is km/h (the real value is 30.0) >>>> 1110 is CFM (the real value is 300)
>>>> 1011 is knots (the real value is 30.00)
【4】is considered as digit*100
>>>> 1 is *100 >>>> 0 is 0*100
【7:5】is considered as B value
>>>> 000 is ℃ (the real value is 25.0) >>>> 001 is ˚F (the real value is 25.0)
The reading is 300pa 25℃ (the above is the low pressure.) / The reading is 3000pa 25℃ (the above is the high pressure.)
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F-3 Response Data Frame
Response value = 11-Byte (includes the position command CRC)
Slave address
Function
Byte count
Data-Pre【15:8】
Data-Pre【7:0】
11H
03H
06H
FFH
81H
Data-Tem【15:8】
Data-Tem【7:0】
Data-Par【15:8】
Data-Par【7:0】
CRC Lo
CRC Hi
02H
C4H
00H
28H
84H
FFH
Data-Pre【15:0】is A value 0 x 1A79 = 6777 (the real value needs to refer the parameter)
Data-Tem【15:0】is B value 0 x 1A79 = 6777 (the real value needs to refer the parameter)
Data-Par【15:0】is parameter value 0 x 009E = 1001 1110 ---【15:8】no value
The reading is -12.7m/s 70.8 ˚F
F-4 Response Data Frame
Response value = 11-Byte (includes the position command CRC)
Slave address
Function
Byte count
Data-Pre【15:8】
Data-Pre【7:0】
11H
03H
06H
1AH
79H
Data-Tem【15:8】
Data-Tem【7:0】
Data-Par【15:8】
Data-Par【7:0】
CRC Lo
CRC Hi
XXH
XXH
00H
9EH
84H
FFH
Data-Pre【15:0】is A value 0 x 1A79 = 6777 (the real value needs to refer the parameter)
Data-Tem【15:0】is random number without reference value.
Data-Par【15:0】is parameter value 003E = 0011 1110 ---【15:8】no value
The reading is 6777*100CFM.
F-5 Conversions and Formulas
1pa=0.000145psi=0.01mbar=0.00001bar=0.1019716mmH2O=0.00401inH2O=
0.0075mmHg=0.0002953inHg
1m/s=196.85ft/min=3.6km/hr=1.944knots=2.237MPH
CMM=m3/min CFM=ft3/min 1ft=0.3048m
G. Precautions
1. This instrument must only be operated within its specifications, or it will be damaged.
2. This instrument has waterproof and dustproof function; please do not use it in a high temperature environment or with
corrosive materials to avoid leakage or damage.
3. On the measuring wind pressure, wind speed and temperature, because the unstable temperature environment or tube
pressure, please multiple sampling or extend the capturing for the signal interval.
4. Use the original pitot tube is suggested for the more accurate measuring value.
5. When the instrument is not use for a long time, please keep it and the all accessories in a dry environment, also please avoid
direct sunlight.
6. If there are any operation questions or malfunction, please contact your local distributor or our service department.
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