Instrumentation Calculators

Coriolis Flow Meter Output Frequency Calculator

This calculator describes how to determine the output frequency of a Coriolis flow meter, which is an important step in incorporating flow measurement devices into industrial operations. Determining the frequency output will provide precise flow rate monitoring and smooth interaction with control systems such as SCADA (Supervisory Control and Data Acquisition) or PLCs (Programmable Logic Controllers).

The number of pulses produced per second (in Hertz or Hz) that indicate the fluid flow rate through the meter is known as the output frequency of a Coriolis flow meter. This frequency is essential for system integration and process control since it is directly proportional to the mass or volume flow rate.

Usually, the output frequency is sent as a digital signal to a control system, like a PLC or DCS, where it is decoded to enable flow monitoring in real time.

The number of pulses produced per unit of mass or volume is determined by the Pulse Scaling Factor (PSF), a Coriolis flow meter setup parameter. Users can adjust the output frequency with the PSF to get the required resolution and process control system compatibility.

For example:

  • If the PSF is set to 50 pulses per barrel, the meter will generate 50 pulses for every barrel of fluid measured.

The output frequency of a Coriolis flow meter is calculated using the formula:

Where:

  • Frequency (Hz): The output frequency in pulses per second.
  • Maximum Flow Rate: The flow rate of the fluid measured in mass or volume per hour, minute, or day (e.g., barrels/hour, liters/minute).
  • Pulse Scaling Factor (PSF): The number of pulses generated per unit of mass or volume.
  • Conversion Factor: A time-based factor to standardize the units:
    • 3600 for flow rates in units per hour.
    • 60 for flow rates in units per minute.
    • 86400 for flow rates in units per day.

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  • Maximum Flow Rate = 100 barrels per hour
  • PSF = 50 pulses per barrel
  • Conversion Factor = 3600 (for hours)

Apply the formula:

The output frequency is 1.39 Hz.

Click here for Comprehensive Guide to Flow Measurement: Principles, Installation, Calibration, and Troubleshooting

  • Maximum Flow Rate = 2000 liters per day
  • PSF = 100 pulses per liter
  • Conversion Factor = 86400 (for days)

Apply the formula:

For a flow rate of 2000 liters per day, the output frequency is 2.31 Hz.

The Conversion Factor depends on the time unit of the flow rate and converts it into seconds for the frequency calculation.

Flow Rate UnitsConversion FactorExplanation
Per hour36001 hour = 3600 seconds
Per minute601 minute = 60 seconds
Per day864001 day = 86400 seconds
  1. Configure the Coriolis flow meter to generate output frequencies compatible with control systems. For example, a PLC or SCADA system might expect frequency outputs within specific ranges for accurate flow rate interpretation.
  2. Ensure compatibility between the flow meter’s frequency signal and the input capabilities of control systems, allowing real-time monitoring and data processing.
  3. Verify the flow meter’s output accuracy by comparing estimated frequencies with real values from commissioning and maintenance.
  4. To obtain the required precision or resolution, modify the PSF. For example, raising the PSF enhances frequency output detail but might necessitate equipment that can handle higher frequencies.

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Sundareswaran Iyalunaidu

With over 24 years of dedicated experience, I am a seasoned professional specializing in the commissioning, maintenance, and installation of Electrical, Instrumentation and Control systems. My expertise extends across a spectrum of industries, including Power stations, Oil and Gas, Aluminium, Utilities, Steel and Continuous process industries. Tweet me @sundareshinfohe

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