Capacity Type Volumetric Flow Sensor XFS Series

Compact, Lightweight, Highly accurate, and Compatible with a wide variety of liquids

Widely used for general measurement and control of liquids in the industrial field and for fuel consumption meters for automobiles.

Compact and lightweight The entire sensor is designed to be compact and lightweight.
For a wide variety of liquids The volumetric design minimizes the influence of liquid viscosity on accuracy,
making the sensor suitable for a wide variety of liquids.
High accuracy and
High resolution		 The special elliptical gear minimizes pressure loss,
enabling high accuracy measurement from very low to high flow rates.
Wide measurement range and high resolution with optical sensor.
Backflow compensation Forward / back flow pulse detection circuits allow accurate net flow measurement
even in the presence of back flow.
*With reverse flow compensation function is XFS-1205, 2205, and 1234.

Principle of Operation　[Optical type]

When fluid flows into metering chamber C from the direction of the arrow, a pressure difference (P1-P2) is generated between the inlet and discharge sides.
This pressure is applied to elliptical gears A and B, causing the gears to rotate (D), and a fixed amount of fluid is discharged in one rotation.

When the fluid passes through the measuring chamber E, the pressure causes the gears and the reflector to rotate in synchronization.
The reflection of light on the reflector is converted into voltage pulses by the optical sensor F and rotation detector G and output.
The pulse signals output from the sensors are input to a counter or other device and converted into various signals.

Two types of detection methods

Optical type
Gear rotation is detected by a reflector and optical sensor. High resolution enables highly accurate measurement of minute flow rates (e.g., engine fuel consumption measurement). 		Magnetic type
Magnets are embedded in the gear and detected by a Hall IC installed on the rotation path. Effective for measuring fluids with poor light transmission (inks, mold release agents, paints, etc.).

Flowmeter Models Selection　 To the Selection guide
Q1. What is the fluid to be measured?
Oil-based fluid
↓
SUS specification or ADC specification		 Water-based (corrosion-resistant) fluid
↓
SUS specification
Q2. How transparent is the fluid?
High transparency
↓
Optical or magnetic		 Low transparency (colored)
↓
Magnetic		 High transparency
↓
Optical or magnetic		 Low transparency (colored)
↓
Magnetic
Q3. What is the maximum flow rate?
120L/h or less
↓		 300L/h or less
↓		 120L/h or less
↓		 300L/h or less
↓		 120L/h or less
↓		 300L/h or less
↓		 120L/h or less
↓		 300L/h or less
↓
Q4. Is backflow compensation required? ↓ ↓ Q4. Is backflow compensation required? ↓ ↓
YES
↓		 NO
↓		 YES
↓		 NO
↓		 ↓ ↓ YES
↓		 NO
↓		 YES
↓		 NO
↓		 ↓ ↓
XFS-1205
XFS-1234		 XFS-1201
XFS-1204
XFS-1201M
XFS-1204M		 XFS-2205 XFS-2201
XFS-2204
XFS-2201M
XFS-2204M		 XFS-1201M
XFS-1204M		 XFS-2201M
XFS-2204M		 XFS-1234 XFS-1204
XFS-1204M		 - XFS-2204
XFS-2204M		 XFS-1204M XFS-2204M

Specifications

Model XFS-
1201		 XFS-
1201M		 XFS-
1205		 XFS-
2201		 XFS-
2201M		 XFS-
2205		 XFS-
1204		 XFS-
1204M		 XFS-
1234		 XFS-
2204		 XFS-
2204M
Measuring Fluid [A] Oil-based Standard Standard Standard Standard Standard Standard Standard Standard Standard Standard Standard
[B] Water-based, Corrosion Resistant             Standard Standard Standard Standard Standard
[C] Colored   Standard     Standard     Standard     Standard
[A] Oil-based：Gasoline, kerosene, diesel oil, heavy oil, turbine oil, transmission oil, lubricating oil, etc. 　
[B] Water-based (corrosion resistant)：Water, alcohol, chemical solution, etc. 　
[C] Colored：Low transparency fluid, etc.
Hydrogen peroxide, methyl ethyl ketone, caustic soda (NaOH), etc. cannot be measured.
Rotational Detection Optical Standard     Standard     Standard     Standard  
Optical + backflow compensation     Standard     Standard     Standard    
Magnetic   Standard     Standard     Standard     Standard
Fitting Hose fitting φ8 Standard
Other options [Each option] R1/8, R1/4, R3/8, Rp1/8, Rp1/4, Rp3/8
Measurement accuracy ±1.0%RD
Flow range Measurement accuracy ±1.0%RD 0.6 to 120L/h 2.0 to 300L/h 0.6 to 120L/h 2.0 to 300L/h
Nominal pulse rate [mL/P.] 0.1250 0.5000 0.03125 0.2500 1.0000 0.06250 0.1250 0.5000 0.03125 0.2500 1.0000
Max. working pressure 2MPa
Operating temperature ℃[℉] −10 to ＋60℃[-14 to 140℉] −10 to ＋120℃[-14 to 248℉] −10 to ＋60℃
[-14 to 140℉]		 −10 to ＋120℃[-14 to 248℉] −10 to ＋60℃
[-14 to 140℉]		 −10 to ＋120℃[-14 to 248℉] −10 to ＋60℃
[-14 to 140℉]		 −10 to ＋120℃[-14 to 248℉]
Storage temperature ℃[℉] −40 to ＋80℃ [-40 to 176℉]
Pressure loss [kPa] / at flow rate in ( ) 2（45L/h） 6（120L/h） 2（45L/h） 6（120L/h）
Power supply DC12V (9 to 15V)
Output signal Voltage pulse (L=0V H=12V)
Connector 5P. metal connector
Main material Housing ADC-12 SUS316
Gear Special carbon
Shaft SUJ-2 Ceramic
O-ring FKM
Reflector SUS316 - SUS316 SUS316 - SUS316 SUS316 - SUS316 SUS316 -

Appearance XFS-1201
 XFS-1205
 XFS-2201
 XFS-2205
 XFS-1204
 XFS-1234
 XFS-2204

Performance Curves and Pressure Drop
Instrumental
Difference
[%]		 Pressure
drop
[kPa]		   [Dotted line]:
Flowmeter performance curve

[Solid line]:
Pressure drop
1 White gasoline 0.3mPa･s
2 Clenzol 0.6mPa･s
3 Diesel oil 3.3mPa･s
4 Spindle oil 7.4mPa･s
5 Turbine oil 55mPa･s
At temperature: 20°C[68℉]
  Flow rate [L/h]     [Note] XFS-1201 typical value
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