The constant flow valve Model 2203 that permits constant flow and the precision flow meter RK1400 are combined in this flow meter 2503F Series to permit high-precision measurement and control of a wide flow range, from very small flow to medium flow, when the pressure on the load side (outlet side) changes.

Features 2503F Series

• This flow meter ensures constant flow under constant pressure on its inlet side even if the load pressure loss on the outlet side changes.
• The measuring section of the flow meter is based on the high precision float type flow meter RK1400.
• The precision valve permits smooth and stable control of very small flow.
• Constant pressure on the inlet side eliminates pressure errors of the float type flow meter, allowing a complete flow control system to be configured.

Standard Specifications

Fluids 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 2–20 L/MIN (Refer to the Capacity Table on page 55.)
Accuracy FS ±2% (Measurement point) (under specified constant primary pressure)
Control pressure The pressure difference between inlet and outlet must be 0.05 MPa or more.
Proof pressure 5 L/MIN or less: 0.8 MPa
10 L/MIN or more: 0.5 Mpa
Available scale 10:1
Material SS Al
Body block SUS316 Al, Brass
Tapered tube Pyrex®, glass
Packing FKM NBR
Float Pyrex, SUS316, glass
Protective cover Acrylic resin
Heat resistance MAX60℃
Connection Rc 1/4 (Standard), Rc 1/8 (Optional)