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Digital flowmeter DF-R280


Measures air flows highly precisely.Multiple Laminar Flow Tubes (range: 10 mL/min to 500 L/min) can be connected.

Handles a wide range of requirements, from in-line inspections to laboratory examination.
Flow sensor features a laminar flow tube that delivers highly accurate readings of ±1%.
Large LCD screen displays flow rates and other useful information

Edge & Function


●Easy-to-navigate configuration with icons Each menu opens by simply touching an icon.

●Test pressure and flow can be monitored in charts.

●Language is selectable among English, Japanese and Chinese.

●Various Hold functions

●Provides desired data.

●Test results can be easily stored in a USB Memory.

●Full 4-digit display

●Temperature Sensor, Line Pressure Sensor and Atmospheric Pressure Sensor provided as standard.

●Display of equivalent flow rate at 1 atm, 20 °C

Color LCD From the Main Menu, sub menus “Measure Screen”,“Settings”, ”System”, ”Comp”,
Touch-Screen ”Analysis”, etc. are accessible.
Measure Screen Can be selected from “Advanced”, “Waveform”, and “Simple”.
Settings Tap the items on the touch screen.
Flow Limits Two sets of leak limits:
Upper limits (UL2/UL), Lower limits ( LL2/LL)
Flow Display Converted flow rate (Value converted to volume at 1 atm at conversion temperature)
USB Port Provided as standard (1 port)
RS-232C 2 ports as standard
Compatible with DF-2820
Language English, Japanese, Chinese
Flow Range 10 mL/min to 500 L/min
Sensor Temperature Sensor, Line Pressure Sensor and Atmospheric Pressure Sensor provided as standard.
Conversion Temperature 0°C, 15°C, 20°C, 25°C, (70°F)
Digital Filter The filter constant (1 to 50) averages the display values which gives stabler measurement.
User Span Adjusts to desired flow rates.
Internal memory 16 G for Ethernet (Option)



Flow Sensor Laminar Flow Sensor (Laminar Flow Tube)
Pressure Media Air
Flow Range Up to 16 ranges for 8 Laminar Flow Tubes
Atmospheric Pressure Sensor Range: 700 to 1200 hPa
Accuracy: ± 0.5% of F.S. + 1digit
Line Pressure Sensor Proof Pressure 50 kPa or less: F.S. Range x 10
100 kPa or less: F.S. Range x 2
Accuracy: ± 0.15% of F.S. + 1digit
Number of Channels 100 channels (0 to 99)
Flow Unit mL/min, L/min, mL/s, L/s, L/h, m3/h, (CFH、CFM)
The units in ( ) are not available for SI unit models.
Pressure Unit kPa, MPa, (PSI、kg/cm2, Bar, mbar, mmHg, cmHg, inHg, mmH2O)
The units in ( ) are not available for SI unit models.
Power Source 100 to 240 VAC ±10%, 50/60 Hz,100 VA max
Select 125 V or 250 V
Option Analog Output
Flow rate + Line pressure
Internal memory
16 G (For FTP)
Line Pressure Compensation Automatic compensation with pressure sensor
Atm Pressure Compensation Automatic compensation with atmospheric pressure sensor
Operating Temperature 5 to 45 °C
Humidity 80 % RH or less / No dew condensation
Differential Pressure Port Size Rc1/8
Weight Approx. 11 kg
Dimensions (mm) (W) 283 x (H) 189 x (D) 382
RS-232C Two-way communication Data calling and writing
Fixed length output DF Format (Various data)/td>
28 Format
Same format as for DF-2800
Baud rate (bps) 1200, 9600, 19200, 38400, 57600, 115200
USB Data storage, writing, backup, etc.
Interface Phoenix Contact (DFMC 1,5/20-ST-3,5-LR)
Standard Accessories Quick Mounting Brackets, Connectors, Inspection record, Traceability documents,


DF-R280(A.BB‘.CD.E.F)   (Conversion temperature, Flow range・Unit, Accuracy, Line Pressure Sensor)

Classification Code Function
A Number of Laminar Flow Tubes 1 to 8 Number of Laminar Flow Tubes
BB’ Laminar Flow Tube Range 10ML to 500L Enter all the ranges.
C Line Pressure Sensor L01 1 to 10 kPa
L05 10 to 50 kPa
L 10 to 100 kPa (Standard)
M 30 to 500 kPa
V -10 to -70 kPa
D Option A Analog output (Flow, Line pressure)
D Memory 16 G (For FTP)
E Unit (Mandatory) UX1 SI units (Mandatory for Japan)
UX2 All units (Only for overseas)
F Power Cord VA 125 V (3 m)
VE 250V (2 m)
VK 250 V (2 m) (Only for Chinese customers)

Flow ranges (Laminar flow tubes sold separately)

Code Model Ranges and number of display digits Line pressure (Max.) Accuracy
10ML LF-104N-10C 0.00 to 10.00 mL/min 990kPa At atmospheric pressure:
±1.0 % of F.S.±1 digit
At Line pressure:
±1.5 % of F.S.±1 digit
20ML LF-104N-20C 0.00 to 20.00 mL/min
50ML LF-104N-50C 0.0 to 50.00 mL/min
100ML LF-104N-100C 0.0 to 100.0 mL/min
200ML LF-104N-200C 0.0 to 200.0 mL/min
500ML LF-104N-500C 0 to 500.0 mL/min
Code Model 1-range (F.S) accuracy range & Display digits L Range & D isplay digits Accuracy range (R.D.) U Range & D isplay digits Line pressure (Max.) Accuracy
1L LF-104N-1L 0.000 to 1.000 L/min 0.000 to 0.300 L/min 0.300 to 1.000 L/min 700kPa ■ 1 range (R.D) / U Range
At atmospheric pressure:
±1.0 % of rdg. ±1 digit
At Line pressure:
±1.5 % of rdg. ±1 digit
■ 1 range (F.S.) / L Range
At atmospheric pressure:
±1.0 % of F.S.±1 digit
At Line pressure:
±1.5 % of F.S.±1 digit
2L LF-104N-2L 0.000 to 2.000 L/min 0.000 to 0.600 L/min 0.600 to 2.000 L/min
5L LF-104N-5L 0.000 to 5.000 L/min 0.000 to 1.500 L/min 1.500 to 5.000 L/min
10L LF-104N-10L 0.00 to 10.00 L/min 0.000 to 3.000 L/min 3.00 to 10.00 L/min 500kPa
20L LF-104N-20L 0.00 to 20.00 L/min 0.000 to 6.000 L/min 6.00 to 20.00 L/min
30L LF-104N-30L 0.00 to 30.00 L/min 0.000 to 9.000 L/min 9.00 to 30.00 L/min
50L LF-105BN-50L 0.00 to 50.00 L/min 0.00 to 15.00 L/min 15.00 to 50.00 L/min 350kPa
100L LF-105BN-100L 0.0 to 100.0 L/min 0.00 to 30.00 L/min 30.0 to 100.0 L/min
200L LF2-200L 0.0 to 200.0 L/min 0.00 to 60.00 L/min 60.0 to 200.0 L/min 50kPa
500L LF2-500L 0.0 to 500.0 L/min 0.0 to 150.0 L/min 150.0 to 500.0 L/min

NOTE1:The above ranges are the flow ranges at atmospheric pressure.
NOTE2:For the Laminar Flow Tubes whose model name has “N” in it, new temperature sensor connectors are being used from April 2011.
NOTE3:For single range (1 range) Laminar Flow Tubes of 1 L/min or above, the accuracy of “0 to full range (F.S.)” or “30% to full range (R.D)” can be selected.
NOTE4:The standard number of display digit: 4 digits. For models of high Line Pressure: 3 digits.