Turbine Flow Sensors Provide Visual Indication, Continuous Sensing and Accurate Switching

Click here for Ultrasonic Doppler Flow Meters

RFI Types - Visual Indicators only

This is the most basic form — a bright orange rotor turning with fluid flow. Simple, direct and reliable. Flow rate is estimated, or simply confirmed, by viewing the speed of the turning rotor. Either port may be used for incoming flow, and bayonet mounting lens is easily removed for quick cleanout. RFI sensors are easy to see, easy to install and easy to afford.

Indicator Types
For those who want simple visual confirmation of flow, RFI Types provide the durable, low-cost answer. A bright, orange spinning rotor provides visual flow confirmation at a glance.

FSP Types - Flow Set Point Switching
For specific flow setpoint switching, switches are one of the most reliable flow switches available. Setpoints are fully adjustable over the specified flow range. The dynamic operation of the rotor guards against jamming and false actuation.

Switches build an extra level of reliability and protection into your equipment. By principle of operation, the rotor cannot be deceived into indicating a positive flow situation when no flow actually exists. Once set to a desired actuation point, RotorFlow will switch to a “no-flow” condition should the rotor stop for any reason.

FRM Types - Flow Rate Monitoring

For flow rate monitoring or metering applications. FRM sensors provide a pulsed DC voltage output that is proportional to the rate of flow. The operating range of 4.5 to 24 VDC pulsed output is easily integrated into most digital logic families. FRM sensors provide a continuous 0-10 VDC analog output. The versatile FRM Type will also feature a 0 to 10 VDC analog output which is proportional to flow rate.

Sensors popularized the 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.

Ultrasonic Doppler Flow Meters measure flow of liquids that contain sound reflectors - suspended solids or gas bubbles - greater than 35 micron size. The DFM flow meter operates by transmitting an ultrasonic sound from its transmitting transducer through the pipe wall into the flowing liquid. The sound will be reflected by useful sonic reflectors suspended within the liquid and recorded by the receiving transducer. The clamp-on style transducer is also available in small pipe and high temperature options, and an insertion probe transducer is available for pipe systems that do not permit ultrasound penetration.

Doppler Flow Meters provide accurate and reliable flow velocity assessments in closed pipe, liquid systems. DFM requires that the liquid be either solids-bearing or aerated at a minimum of 100 ppm. The product utilizes a single, hand-held transducer which is placed on the outside of metal or plastic pipe. Within seconds after placing the transducer, the large LCD will provide a velocity reading in either FPS (feet per second) or MPS (meters per second). The DFM comes with a flow calculator/slide chart for conversion of velocity measurements to popular volumetric measurements.

You can mount the sensor on the outside a pipe in less than a minute. Use the built-in keypad and calibration menu to set up the flowmeter for your application. The DFM works on any liquid containing bubbles or solids and is recommended for "difficult liquids" like wastewater, slurries, sludge, chemicals, viscous liquids and abrasives. Measures flow through most metal and plastic pipes including PVC, ductile iron, carbon steel and stainless steel.

Doppler Ultrasonic Flow Meters Operating Theory

Doppler ultrasonic flow meters are designed to operate on metal, plastic or rubber pipes containing liquids with greater than 25 ppm of suspended solids or entrained gases that act as reflectors. Typically, the Series 900 is used for cleaner liquids (25 ppm to 4% reflectors by volume) and the Series 300, 600 are applied on systems which contain liquids that contain greater amounts of suspended "reflectors" (100 ppm and greater).

Doppler flow meters utilize two piezoelectric crystals contained within either one transducer head or two separate transducer heads to transmit ultrasonic sound energy into the fluid stream and receive reflected sound from reflectors (suspended solids or entrained gases) within the liquid. See Figure 1. In accordance with the theories of Christian Johann Doppler (circa 1842), if the liquid is moving (and therefore carrying the reflectors with it) and oscillating energy is imposed on the moving reflector, the reflected energy's frequency of oscillation will be altered with respect to the transmitted frequency. The magnitude of frequency change is directly proportional to the velocity of the reflector. Doppler meters process the differences in transmitted and received frequencies and report the measurement as flow velocity.

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Disclaimer: The information conveyed here is based on records and research for your information which is for horticultural, educational, sacramental and research purposes only. No statement should be taken as medical advice. It is not claimed or implied here that Mono-atomic SILVER-MAX or Colloidal mineral waters will cure any disease.

Contact: Biophysica Inc., Toronto, Ont, Canada M6R 1S5 Phone: (905) 827-9448 (10am to 10pm EST)

e-mail: info@biophysica.com

This page last updated on January 18, 2006

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