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『Efm Flow Meter Calibration Data: Vortex and Turbine Flow Tech Overview』Related information(v cone flow meter|rotary gas meter|gallon meter|gear meter|metal tube rotameter|glass tube rotameter|nutating disk meter|transit time ultrasonic flow meter|wedge flow meter|pd meters|hydraulic flow meter|ultrasonic water flow meter|water flow meter|air flow meter|magnetic water flow meter|oxygen flow meter|gas flow meter|argon flow meter|air velocity meter|gasoline flow meter|fuel flow meter|ultrasonic water meter|digital water meter|nitrogen flow meter|solid flow meter|Oxygen tank flow meter|digital water flow meter|diesel fuel flow meter|steam flow meter|02 flow meter|compressed air flow meter|oil flow meter|liquid flow meter)
Efm Flow Meter Calibration Data: Vortex and Turbine Flow Tech Overview
Quick Answer
Efm flow meter calibration data for vortex and turbine meters includes pulse scale factor, K factor, and temperature pressure compensation values that a flow computer uses to convert raw pulses into engineering units. Silver Instruments supplies both meter types with calibration sheets that load directly into common EFM systems. Send us your pipe size in DN, flow range in kg/h or m3/h, and process temperature in °C. We will send a quote with the correct meter model and calibration data package.
Most engineers skip the calibration data step and then wonder why totalized volume drifts. The calibration data is not static. It changes with meter type, line size, and fluid. For vortex meters the K factor depends on bluff body geometry and Reynolds number. For turbine meters the K factor changes with viscosity and flow profile. We have seen this on customer sites many times.
What Is EFM Flow Meter Calibration Data
An EFM or electronic flow meter system reads pulse output from a primary device and converts it to flow rate. The calibration data for a vortex meter includes the K factor expressed in pulses per litre or pulses per cubic metre, the low flow cut off, and the density correction table. For a turbine meter the calibration sheet includes the meter factor, viscosity limits, and the linearity band from 0.5 percent to 99 percent of range. Without this data the EFM cannot correct for non linear output at low flow.
Vortex Flow Meter Calibration Data in EFM Systems
Vortex meters work well on steam, compressed air, natural gas, and clean water. A DN50 vortex meter from Silver Instruments with a K factor of 340 pulses per litre and a 4-20 mA HART output will feed a typical EFM system without extra signal converters. For a gas custody transfer station in Malaysia we supplied DN80 vortex meters with pressure and temperature compensation. The calibration data included the K factor at three gas densities and the low flow cut off at 0.8 m/s. That station improved its daily totalization error by 1.2 percent compared to the old orifice plate setup.
Turbine Flow Meter Calibration Data in EFM Systems
Turbine meters suit clean liquids like diesel, jet fuel, solvents, and water. The calibration data from a Silver Instruments turbine meter includes the average K factor from a 10 point water calibration and the repeatability limit. For a diesel transfer skid in Vietnam we used a DN40 turbine meter with a K factor of 42.7 pulses per litre and a viscosity limit of 50 cP. The EFM system stored the K factor and applied a polynomial correction from 1 cP to 50 cP. The result was a stable batch volume
Typical Parameter Pairing with Silver Instruments Models
For a DN50 steam line at 10 bar and 180 °C, the Silver Instruments SIV-50 vortex flow meter with integrated PT100 and 4-20 mA HART output is a standard match. The EFM calibration data includes the steam density table and the K factor for that meter body. For a 2 inch diesel line at 20 to 40 °C, the Silver Instruments SIT-50 turbine flow meter with pulse output and RS485 Modbus is a common choice. The calibration sheet lists the K factor in pulses per litre and the viscosity correction curve. Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. We will propose a meter and a calibration data package that fits your EFM input map.
You can reach Silver Instruments by Tel: +86-135-1213-1526 or Whatsapp: 86-135-12131526. WeChat: +86 13512131526. Ask for a calibration data sample for your fluid and line size.
FAQ
What K factor do I enter into my EFM for a vortex meter?
The K factor on the calibration sheet from Silver Instruments is the starting point. It is usually in pulses per litre or pulses per cubic metre. Enter that value first. Then apply the low flow cut off and the density correction if your EFM supports it.
Can I use a turbine meter for gas with EFM calibration data?
Turbine meters work on clean dry gas but they are less common than vortex meters for gas because of moving parts. For natural gas custody transfer a vortex meter is often the better fit. Tell us your gas composition and line size.
How often should vortex and turbine meter calibration data be checked?
For custody transfer we suggest checking the calibration data every 12 months. For process control a 24 month interval is acceptable. If the fluid changes viscosity or the meter is moved to a different line size, order a new calibration sheet from Silver Instruments.
Does Silver Instruments supply the calibration data as a file for my EFM system?
Yes. We provide a calibration sheet in PDF and CSV formats. The CSV file can be imported into most flow computers. We include K factor, linearity table, low flow cut off, and temperature pressure limits.
What is the typical price difference between vortex and turbine meters for a DN50 line?
For a DN50 line with 4-20 mA HART output the vortex meter usually costs about 20 percent more than a turbine meter. The vortex meter has no moving parts and handles steam and gas. The turbine meter offers higher accuracy on clean liquids. For a quote send your flow range and fluid type to Tel: +86-135-1213-1526 or Whatsapp: 86-135-12131526. You can also reach us on WeChat: +86 13512131526.