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Flow MeterFlow MeterFinal Project PresentationFinal Project Presentation

Gabrielle Di BaccoGabrielle Di BaccoPHYS 2P32PHYS 2P32

April 13April 13thth 2016 2016

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Abstract …................................................................................................. pp. 3Abstract …................................................................................................. pp. 3

Background Information on Flow Meters.................................................. pp. 4 Background Information on Flow Meters.................................................. pp. 4

GEMS RotorFlow Sensor [Flow Meter] ....................…........................... pp. 5 GEMS RotorFlow Sensor [Flow Meter] ....................…........................... pp. 5

Final Project............................................................................................... pp. 6 Final Project............................................................................................... pp. 6

PICLab Board............................................................................................ pp. 7 PICLab Board............................................................................................ pp. 7

Code........................................................................................................... pp. 8 Code........................................................................................................... pp. 8

Flaws in System/Failed Models................................................................. pp. 9 Flaws in System/Failed Models................................................................. pp. 9

Improvements …....................................................................................... pp. 10Improvements …....................................................................................... pp. 10

Table of ContentsTable of Contents

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● Due to mechanical issues and time restraints, the initial Due to mechanical issues and time restraints, the initial abstract of the project has been modified. abstract of the project has been modified.

A flow meter sensor performs the instantaneous A flow meter sensor performs the instantaneous measurement of the flow-rate of water. The design utilizes measurement of the flow-rate of water. The design utilizes the PICLab board used in PHYS 2P32. Water is introduced the PICLab board used in PHYS 2P32. Water is introduced through an input tube, turning the flow meter and creating a through an input tube, turning the flow meter and creating a square-wave output. The time between pulses is calculated square-wave output. The time between pulses is calculated through the use of the PICLab and utilized to display the through the use of the PICLab and utilized to display the instantaneous flow-rate of the water on the display. instantaneous flow-rate of the water on the display.

AbstractAbstract

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● Types of Flow Measurement Types of Flow Measurement

– Positive displacement flow metersPositive displacement flow meters

– Pressure based flow metersPressure based flow meters

– Electromagnetic flow metersElectromagnetic flow meters

– Mass based flow metersMass based flow meters

● A flow meter is an instrument used to measure linear, A flow meter is an instrument used to measure linear, nonlinear, mass or volumetric flow rate of a liquid or a nonlinear, mass or volumetric flow rate of a liquid or a gas. gas.

● Flow meters are comprised of a primary device, a Flow meters are comprised of a primary device, a transducer and a transmitter. transducer and a transmitter.

Background Information on Flow MetersBackground Information on Flow Meters

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GEMSGEMS™™ RotorFlow Sensor [Flow Meter] RotorFlow Sensor [Flow Meter]

● Paddle-wheel design. Paddle-wheel design.

● Frequency output range 15 Frequency output range 15 Hz (low) to 225 Hz (high). Hz (low) to 225 Hz (high).

● Magnetic rotor spins at a Magnetic rotor spins at a rate proportional to flow. rate proportional to flow.

● Magnetic fields (rotor Magnetic fields (rotor vanes) excite Hall Effect vanes) excite Hall Effect sensor to produce voltage sensor to produce voltage pulses.pulses.

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Final Project Final Project

● Plastic tubing connects faucet to RotorFlow sensor. Plastic tubing connects faucet to RotorFlow sensor.

● Output signal from RotorFlow sensor wired to PORT E on PICLab Output signal from RotorFlow sensor wired to PORT E on PICLab board and pulled up with resistor. board and pulled up with resistor.

● Time between pulses of the square wave input from sensor is Time between pulses of the square wave input from sensor is utilized to determine the instantaneous flow rate of the water, given utilized to determine the instantaneous flow rate of the water, given a constant volume being moved through the RotorFlow sensor with a constant volume being moved through the RotorFlow sensor with each pulseeach pulse

● Single pulse volumes calculated using the Frequency vs. Flow Rate Single pulse volumes calculated using the Frequency vs. Flow Rate Typical chart in the GEMS RotorFlow sensor data sheet.Typical chart in the GEMS RotorFlow sensor data sheet.

At 15 Hz: 1 pulse = 2.103 mLAt 15 Hz: 1 pulse = 2.103 mL

At 34 Hz: 1 pulse = 1.855 mLAt 34 Hz: 1 pulse = 1.855 mL

At 54 Hz: 1 pulse = 1.753 mL At 54 Hz: 1 pulse = 1.753 mL

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PICLab BoardPICLab Board

● Cable wired between Cable wired between prototyping area and RE0 prototyping area and RE0

● 1.5 K1.5 KΩΩ resistor added to pull resistor added to pull up voltageup voltage

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CodeCode

See attached file programcode.asmSee attached file programcode.asm

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Flaws in System/Failed ModelsFlaws in System/Failed Models

● Optical sensor model couldn't detect disturbancesOptical sensor model couldn't detect disturbances

● Siphon model wouldn't stop emptyingSiphon model wouldn't stop emptying

● The aThe averageverage part of the code doesn't display an average value part of the code doesn't display an average value close to the values obtained otherwise. close to the values obtained otherwise.

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ImprovementsImprovements

● Calculate average flow rate Calculate average flow rate and use to calibrate and use to calibrate instantaneous flow rateinstantaneous flow rate

● Attach low-flow adapter to Attach low-flow adapter to RotorFlow sensor RotorFlow sensor