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)
