listing placed 14 November 2009 United Kingdom

Fuel Flow Sensor

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40

PADDLE-WHEEL HALL-EFFECT FLOW SENSOR

A compact flow-transducer component that converts fluid flow-rates into a pulsed output signal.

Similar to RS product: 508-2704 [?84.15 + vat]

Basic principle: The fluid passes across a 'paddle wheel' impeller containing three ceramic magnets. The rate of rotation of the paddle wheel is proportional to the rate of flow of fluid through the chamber [within limits]. A 'hall effect' sensor sealed in the rear portion of the assembly switches a transistor output as each magnet passes.

Suitable for most fluids: Water, Petroleum Fuels, Light Oils, Alcohols etc

Can be used with gases and air - BUT it must be remembered when measuring fast flow that the impeller will continue to spin for a moment after the gas flow has stopped and this can compromise the accuracy of flow-rate measurement.

Translucent case with visible rotary impeller - gives visual indication of flow.

Ports are very slightly under 10mm external diameter. Can be used with hose or most 10mm push-fit or compression fittings. Internal diameter is 6mm. The ports could possibly be given a 1/8" bsp thread.

DIMENSIONS - End to end: 75mm

PULSE RATE: Linear over a wide range [I have tested a sensor over 0.4~3LPM range]. Over this range the sensor gave one pulse per 0.88 cubic centimeter. Or 1140 pulses per litre. Accuracy in this range was definitely within a 5% margin - but in practice you will find that accuracy will be dependent on the range of flow-rates and other factors such as sudden flow-rate changes, entrained bubbles, fluid viscosity etc.

I expect that the exact rates will differ slightly for different sensors. For greater accuracy you will need to calibrate your system using measured quantities of fluid at the flow-rates anticipicated. ?40 plus p+p less than half price
BRAND NEW
07821 303033