Kofloc Rotameter with Controller 2504FR Series

Flow Meter with Flow Controller (Not Subject to Inlet Pressure Change)

The constant flow valve Model 2204 that permits constant flow and the precision flow meter RK1400 are combined in this flow meter to permit high-precision measurement and control of a wide flow range from very small flow to medium flow when the gas supply pressure (inlet side) changes.

Kofloc Rotameter with Controller 2504FR Series


  • This flow meter ensures constant flow under the constant pressure on its outlet side even if the pressure on the inlet side changes.
  • The flow controller is made on the basis of the Model 2204 with excellent precision control characteristics, permitting smooth control of very small flow.
  • The measuring section of the flow meter made on the basis of the high-precision float type flow meter RK1400 ensures highly reliable flow.

Specification of Kofloc Rotameter with Controller 2504FR Series

Air,N2,O2,H2,He,Ar,CO2 (Calibration with actual gas)
For other gases, please consult us regarding conversion conditions or calibration with the actual gas to be used.
* Option: Scales for two types of fluids
Flow range (FS) : From 1–10 ML/MIN to 1–10 L/MIN
 FS ±2% (Measurement point)
The flow fluctuation is within FS ±2% when the inlet pressure changes to 0.07–0.7   MPa under  the flow meter outlet pressure condition.
Control pressure : The pressure difference between inlet and outlet must be 0.07 MPa or more.
Proof pressure 
5L/MIN or less : 0.7MPa
10 L/MIN or more: 0.5 Mpa
Available scale : 10:1
SS (body: SUS 316, Packing: FKM)
Al (body: Al, Brass, Packing: NBR)
Tapered tube : Pyrex , glass
Float : Pyrex, SUS316, glass
Protective cover : Acrylic resin
Heat resistance : MAX60℃
Connection : Rc 1/4 (Standard), Rc 1/8 (Optional)