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RFA Types 

Flow Rate Monitoring 

 

 
RFO and RFA Types 

Quick Specs... 

  • Accurate Flow Rate Indication with Integral Visual Confirmation 
  • 0-10 VDC Analog Signal @ 1 mA Max 


 

 

  Overview    Specifications    Dimensions    Related Info   
               

Overview / Design Principle: 

Gems Sensors popularized the RotorFlow’s paddlewheel design by combining high visibility rotors with solid-state electronics that are packaged into compact, panel mounting housings. They provide accurate flow rate output with integral visual confirmation...all with an unprecedented price/performance ratio. 

Applications: 

  • Water Purification/Dispensing Systems 
  • Chemical Metering Equipment 
  • Lasers and Welders 
  • Water Injection Systems 
  • Semiconductor Processing Equipment 
  • Chillers and Heat Exchangers 

 

 

Specifications 

Wetted Materials   

Body  

Brass, Stainless Steel or Polypropylene (Hydrolytically Stable, Glass Reinforced)  

Rotor Pin  

Ceramic  

Rotor  

PPS Composite, Black* 

Lens  

Polysulfone  

O-Ring 

Viton® (Alloy Bodies); Buna N (Polypropylene Body) 

Low Flow Adaptor                  

Glass Reinforced Polypropylene  

Operating Pressure, Maximum    

Brass or Stainless Steel Body 

200 PSIG @ 70°F (13.8 bar @ 21°C), 100 PSI @ 212°F (6.9 bar @ 100°C)

Polypropylene Body  

100 PSIG @ 70°F (6.9 bar @ 21°C), 40 PSI Max. @ 180°F (2.8 bar @ 82°C)

Operating Temperature 

Brass or Stainless Steel Body 

-20°F to 212°F (-29°C to 100°C) 

Polypropylene Body  

-20°F to 180°F (-29°C to 82°C)  

Other Specifications 

Electronics  

150°F (65°C) Ambient  

Viscosity, Maximum               

200 SSU  

Input Power 

 24 VDC, ±10%  

Output Signal   

 0-10 VDC Analog Signal @ 1mA, Max 

Current Consumption 

 25 mA, Max 

Current Source Output, Max 

 10 mA  

Accuracy   

 See Ordering Information

Electrical Termination   

 22 AWG PVC-Jacketed, 24” Cable. Color Coded: Red = +VDC, Black = Ground, White = Signal Output  

*Standard on Stainless Steel bodies 

Polypropylene Bodies 
 DimRFOPoly.gif 
A  .64" (16.3 mm) 
B  2.50" (63.5 mm) 
C  3.06" (77.7 mm) 
D  .80" (20.3 mm) 
E  2.38" (60.5 mm) 
Brass and Stainless Steel Bodies - .25" and .50" Port 
 DimRFO25.gif 
A  2.50" (63.5 mm) 
B  3.01" (76.4 mm) 
C 

1/4" ports = .80" (20.3 mm)                        
1/2" ports = .87" (22.1 mm) 

D  2.32" (58.9 mm) 
Brass and Stainless Steel Bodies - .75" and 1.00" Port 
 DimRFOBRS.gif 
A  2.50" (63.5 mm) 
B  3.94" (100 mm) 
C  1.06" (26.9 mm) 
D  2.95" (74.9 mm) 

Frequency vs. Flow Rate Graphs
0.25 inch, 0.1 to 5.0 
0.50 inch, 1.5 to 20.0 
0.75 inch, 5 to 30.GPM 
1 inch, 8 to 60 GPM   

Additional Product Information: 
Easy Installation and Maintenance 
Operating Principle 
Typical Pressure Drop 
Signal Output 
Display and Power Accessories 

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