FloCat SF45-A Turbine Flow Sensor

The FloCat SF45-A Series Turbine Flow Sensor is designed to measure the flow of hydrocarbon fuels such as gasoline, kerosene, and #2 diesel fuel and other light transmitting, non-corrosive liquids of similar viscosity. The sensor provides repeatable signals on gasoline across a 100 to 1 flow range down to 0.3 GPH. The higher viscosity of diesel fuel reduces signal repeatability at flow rates below 2 GPH. Pressure drops are very low compared to other turbine flow sensors and the bearing system is rated for continuous operation at the upper end of the flow range. The SF45-A sensors produce a current pulse signal from an opto-electronic pickup with a preamplifier.

Operating Principle

Liquid enters the flow chamber tangentially, follows a helical flow path, and exits vertically, thereby venting any entrained vapor bubbles. The rotational velocity of the liquid is directly proportional to flow rate. A neutrally buoyant rotor spins with the liquid between V-jewel bearings. Rotor movement is sensed when notches in the rotor interrupt an infrared light beam between an LED and phototransistor.

The vapor venting design requires that the sensor be positioned with the electrical connectors pointing up. Turbulence caused by valves or sharp elbows mounted close to the sensor inlet can affect the K-factor and should be minimized.

• Pressure 200 PSI Max
• Temperature -65 to 100°C Max

Specifications

Materials of Construction:

Body Die-cast aluminum, cadmium plate, dichromate finish;
Rotor Nylon 6/12;
Rotor Pivot Stainless steel, Carpenter 420;
Phototransistor SD 1440;
Light Emitting Diode SE 1450;
Connectors 22 gauge wire leads (3)

Output:

Pulse

Input Power:

12 VDC

Temperature:

-85 to 212°F max

Pressure:

200 PSI max

Repeatability:

±0.5% between measurements

Bearing Life Expectancy:

10,000 hr min

End Connections:

1/4" NPT(F)