Presentation on theme: "Introduction to Flow Meters"— Presentation transcript:
1 Introduction to Flow Meters What are Flow metersA flow meter is an instrument used to measure linear, nonlinear, mass or volumetric flow rate of a liquid, steam or a gas.Selecting a Flow meterThe basis of good flow meter selection is a clear understanding of the requirements of the particular application.Evaluating the nature of the process fluid and of the overall installation.Innovative Technologies, Creative SolutionsQuality & Simplicity in Flow Measurement
2 Selecting a flow meterKey questions which need to be answered before selecting a flow meter:What is the fluid being measured by the flow meter.Do you require rate measurement and/or totalisation from the flow meter?What viscosity is the liquid?Characteristics of the fluid (Is the fluid clean, have particles?)Do you require a local display or do you need a signal output?What is the minimum and maximum flow rate ?What is the minimum and maximum pressure?What is the minimum and maximum temperature?Is the fluid chemically compatible with the flow meter ?If this is a process application, what is the size of the pipe?
3 How To Select a Flow meter FLOW METER SELECTIONHow To Select a Flow meterLine Size – Do not choose meter on line size.Flow Range – Same size meters can have totally different flow ranges.Fluid Compatibility – Check meter materials of manufacture are compatible with fluid.Viscosity –Flow de-rating factors or limits may apply.Connections –Pressure rating of meter flanges.Protection – Choose correct mesh size for strainers.Accuracy & Repeatability – Repeatability is the more important parameter
4 Turbine Flow metersThe turbine meter normally has an accuracy of 0.5% of the reading. It is a very accurate meter and can be used for clean liquids and viscous liquids up to 100 centistokes. A minimum of 10 pipe diameters of straight pipe on the inlet is required. The meters consists of a multi-bladed rotor mounted at right angles to the flow and suspended in the fluid stream on a free-running bearing.
5 Paddlewheel SensorsOne of the most popular cost effective flowmeters for water or water like fluids. Many are offered with flow fittings or insertions styles. These meters like the turbine meter require a minimum of 10 pipe diameters of straight pipe on the inlet and 5 on the outlet. The rotor of the paddlewheel sensor is perpendicular to the flow and contact only a limited cross section of the flow.
6 Positive displacement flow meters Positive Displacement meters come in various configurations & are a very versatile flow meter, best suited for high viscosity & non–conductive liquids. They have high accuracy (linearity & repeatability) with low flow and precise batch capability. Meter requires no flow conditioning for simple installation and are easy to understand & service.Oval GearRotary Piston
8 GEAR WHEEL FLOWMETER Oval gear flow meters Among the many Positive Displacement flow meter design principals available today, the oval gear wheel still holds a top place in simplicity & field proven performance.
9 Oval gear flow metersOPERATION OF OVAL GEAR FLOW METER
10 Oval gear flow metersTrimec Flow Products Oval Gear Wheel meters provide high levels of accuracy & repeatability for a wide range of clean liquids irrespective of viscosity & conductivity either pumped or gravity fed.
11 General Specifications Oval Gear Flow Meters Flow range: litres / Hr ~ 2500 litres / min.Nominal sizes: 4mm ~ 100mm pipe sizeLinearity: +/- 0.5% of reading ( +/- 0.2% with linearisation )( +/- 1% for Mechanical Displays )Repeatability: /- 0.03%Temperature: ~ +120 Deg C - StandardMaterials: aluminium or 316 stainless steelPulse outputs: reed & NPN open collectorMechanical Displays: 3 ,4 & 5 digit
12 Oval gear flow meters Meter Features Optional Rotor Material - on all meter sizes ( excludes extended flow versions )BENEFITSRotor Stability( On Metal Rotors )120 Deg. Temp. Rating.( High temp rotors not required )Aluminium, Ryton & Stainless Steel materials.Metal Roller, Carbon or Ceramic Bearings.
13 Modular Process Connections Oval gear flow metersMeter FeaturesModular Process ConnectionsAvailable on 25mm to 100mm meter sizes.Simplifies InstallationScrewed or Flanged connections.Stainless option on screwed versions.
14 Oval gear flow meters Meter Features Pulse Output Boards Dual Outputs ( reed & Hall ) Standard.Quadrature Pulse Output Option.Pulse Interrogation connectionHigh Pulse Output option ( Hall only )
15 Oval gear flow meters Meter Features Low & High Flow Capabilities Broad Range 1/8” to 4”0.5 LPH to 2500 LPMHigh Precision +/- 0.5%Optional +/- 0.2% with linearizationUnaffected by pulsationsNo Flow Conditioning required
16 Oval gear flow meters Meter Features Available as pulse meter only or with integral or remote mount LCD or mechanical registers.Dual Outputs ( reed & hall) as standard.Weatherproof IP66 / 67 LCD modelsFlameproof / Explosion proof construction Atex & IECeXIntrinsically Safe Integral Instruments.Modular connections for adaptability and ease of installation and service.Quadrature pulse output option for pulse verification or forward / reverse measurement.High Flow Capabilities ( 2500 lpm )NMI Certification ( Resale Purposes ) meter sizes 1” to 4” fitted with air eliminator strainer and approved register.
17 Oval gear flow meters Meter Features High Precision / High resolution ( Pulses per Litre )120 Degree Temperature Rating as standard.High & Low viscosity applications.3 , 4 or 5 digit Mechanical Registers with large number displays. ( Metal Housings with or without accuracy adjustment )Gearbox fitted with stainless steel gears as standard.Aluminium rotors fitted with high speed roller bearings.Stainless rotors fitted with ceramic or carbon bearings.Ryton RotorsViton seals as standard.
18 Oval gear flow meters Meter Features Advantages Opposition Metal & Plastic Rotors Metal & PlasticModular Connections Cast in meter bodyHigher Temperatures -120deg deg.Higher Flows 25mm size – 150 lpm lpmLarger Flow Range – 2500 lpm lpmMore Models – Extended Capacity N/ADuctile Iron material N/AATEX & IECex approvals N/ANMI approval Mechanical Meters N/AAccuracy Adjustment – Mechanical N/AViton seal standard NitrileElectronics – own manufacture Fluidwell / FluxGearbox – stainless gears Plastic GearsLarge size reset number display Small reset numbers
19 Oval gear flow meters Meter Specifications: Low Pressure Drop standard feature.Extended Flow Models available in 2”, 3” & 4” sizes.Factory calibration & accuracy certificate supplied.Flexibility of Installation. ( vertical or horizontal lines )Min. number of moving parts in LCD pulse meters ( 2 Rotors )Continued product development commitment.Standard Meter – Pulse OutputOptions ~ LCD Register~ Mechanical Register~ Batching Register
20 Oval gear flow meters Meter Specifications: Minimum number of moving parts in pulse meters2 RotorsReed Switch
21 Oval gear flow meters Meter Selection Meter max. flow rates are based on 1 bar pressure dropWith Fluids above 1200 cps. Meter sizing and required flow rate become important decisions.To achieve the lowest possible pressure drop, a range of special cut “ Keishi” high viscosity optional rotors are available.The Dimak series oval gear meters are extremely suited to measuring highly viscous materials with the pressure drop being the only limiting factor.Special rotors applies to meters sizes TF-008 to TF-100 also refer to de-rating factor for reduced flow rates applicable
22 Oval gear flow meters Flowmeters VISCOSITY CORRECTION Depending on the fluid viscosity the flow meters maximum flow rate may be de-rated according to the attached chart Example:- TF25 meter measuring 6000 Cp Max Flow 150 lpm x 0.5 = 75 lpm new maximum flow rate to maintain 1 bar pressure drop.
24 Oval gear flow metersAccuracy & Pressure Drop Curves
25 Flow Instrumentation Products FBT11 Battery Powered TotaliserREMOTE OR INTEGRAL METER MOUNTSimultaneously displays re-settable (batch) total in engineering units as programmed by the user. When externally dc powered the instrument will produce an un-scaled or scaleable solid state output pulse which is NPN / PNP selectable.
26 Flow Instrumentation Products FRT12 Flow Rate TotaliserREMOTE or INTEGRAL METER MOUNTINGSimultaneously displays re-settable (batch) total & cumulative total in engineering units. When externally dc powered the instrument will produce an un-scaled or scaleable solid state output pulse which is NPN / PNP selectable.
27 Flow Instrumentation Products FRT-40 Flow Rate TotaliserREMOTE or INTEGRAL METER MOUNTINGBattery or External powered, 6 digit large LCD total & 8 digit cumulative totaliser, with 5 digit rate display.IP66/67 ~ Nema 4X aluminium housing.LCD Backlighting as standard.Scaled Pulse Output.Optional facia protection shieldMetal Housing as standard
28 Flow Instrumentation Products FEB10 Batch ControllerREMOTE or INTEGRAL METER MOUNTINGProvides automatic batch control with one or two stage outputs. Display provides batch quantity as well as status at each stage of the batch process. Batch limiting & no flow detection plus automatic over run compensation. Other features include remote stop / start, system interlocks and multiple batch controller networking.
29 Ancillary Products Cooling Fin When fitted to flow meter, the cooling fin allows meters to be fitted with electronic display to be rated to 120 deg CCompact design allows adequate heat dissipation in ambient temperatures
30 Ancillary Products FI-420 Frequency Converter The Frequency converter is a programmable, non volatile PCB which is link selected to serve as either a frequency to current converter (F/I) or a single point flow rate alarm device for high or low rate detection - Board fits onto flow meter output PCB.FI-420 Programmed at factory or in situ with hand held programmer
31 Ancillary Products RELAY OUTPUT BOARD The relay output boards are an option for the Z3 & B1 Instruments. The relays will switch higher loads ( 5 Amp ) than the solid state switches provided as standard in these instruments
32 Ancillary Products PD2 Pulse Discriminator Module Application is for discriminating bi-directional flows. Accepts two independent inputs from flow meters with quad pulse outputs. Discriminates flow direction from inputs and provides forward & reverse pulse outputs for each flow direction
33 Ancillary Products PR2 Pulse Repeater Module The pulse repeater provides electronic protection to the flow meter output in situations where associated external circuitry may have heavy electronic loadings, non regulated power supplies or electrical surges or spikes
34 Ancillary Products Flow Instrumentation Products Exd Explosion Proof HousingRobust aluminium or stainless field mount housing.Four Large external non- invasive operational switches.IP66 ~ Nema 4X Rated.View, program & operate instruments without cover removal.Certifications – FM, ATEX, SAA
35 Ancillary Products Flow Instrumentation Products Mechanical Registers Standard - without accuracy adjustmentAs an alternative to electronic totalisers, robust mechanical registers with metal housings offer 3 or 4 large resettable digits & 6 or 8 accumulative total displays clearly visible for loading & un-loading sites at petroleum depots, mining, construction & marine facilitiesM1 RegisterM3 Register
36 Ancillary Products Flow Instrumentation Products Mechanical Registers V Style - with accuracy adjustmentAs an alternative to electronic totalisers, robust mechanical registers with metal housings offer 5 large re settable digits & 8 digit accumulative total displays clearly visible for loading & un-loading sites at petroleum depots, mining, construction & marine facilitiesV1 Register with accuracyadjuster
37 Ancillary Products Ticket Printers Flow Instrumentation Products Meter Register and Ticket Printer combine together to produce clean, detailed printed records of high speed fluid deliveries and transactions
38 Ancillary Products Flow Instrumentation Products Mechanical Preset Batch Registers As an alternative to electronic batch controllers or in Ex Proof applications, mechanical preset registers with shutoff valve are available in sizes from 2” to 4”
39 Ancillary Products STRAINERS Typical Y StrainerSTRAINERSAs the meters are only suitable for clean liquids it is important that any impurities are removed prior to the meter.Recommended Mesh SizesSIZEMesh SizeMicronSize1/4"200 mesh75DN83/8"DN101/2"100 mesh150DN151"50 mesh250DN251 1/2"DN402"25 mesh500DN503"DN804"DN100
41 High Pressure Models High Pressure Models Sizes up to 50mm Pressures to 400 Bar (6000 PSI )Special end connections availableHall effect outputDeep Sea applicationsChemical InjectionHydraulic applications
42 FLOWMETER CALIBRATION Every Flowmeter undergoes a check before leaving the factory for correct operation & function of pulse outputs & ancillary electronics if fitted.Meters are then compared against a master meter which is traceable to the Australian National Standards & issued with a calibration report.
43 METER CALIBRATIONCompany has 4 meter calibration test benches using certified master meters for validating meter accuracy. Small meters to 750 l/hr. Medium meters to 500 l/min. Large meters to 1500 l/min.
44 Positive Displacement Meters Installation Points:PD Meters do not work well with silty or dirty fluids ( Use Strainers before meter )Straight Pipe not necessary before meter.Teflon Tape can cause rotor stoppages.High Velocity flows can cause rotor destruction ( Slowly ramp up flow on start up )Avoid Water Hammer caused by closing valves quickly in batch applicationsFlush Pipe Lines prior to meter installation
45 RECOMMENDED INSTALLATION strainerFlow meterisolation valveby-pass valveOpen downstream valve lastIt is important when starting up the process that the downstream valve is slowly opened last
46 Additional Products Additional Products Specialised Fuel MetersLow cost fuel flow meters designed for monitoring of fuel in Trucks, Buses & vehiclesEM025 MeterEM008 Meter
47 METER APPLICATIONS Acids Alcohol Water Fuel Oils Diesel Liquid Propane Bitumen / AsphaltTallowPaintPharmaceuticals