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Spirax Sarco Orifice Plate System

Learn how orifice plates work, their calculations, pressure transmitters, and benefits/limitations. Explore the traditional M240G system and innovative FCX-A/CII transmitters for accurate flow measurement and improved performance.

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Spirax Sarco Orifice Plate System

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  1. Spirax Sarco Orifice Plate System www.coulton.com

  2. How they work.... Flow dp www.coulton.com

  3. Orifice calculations... • The pressure drop across an orifice plate is used to derive the rate of flow using....................... • BS 1042 • ISO 5167 • ASME MFC - 3M (1989) • Flow = K dP www.coulton.com

  4. Orifice Plate Output Flow Error 1:1 Flow Error 2:1 www.coulton.com

  5. Traditional M240G system www.coulton.com

  6. Pressure transmitters FCX-A/CII Dual Temperature Compensation Eprom Silicon Sensor www.coulton.com

  7. Pressure transmitters FCX-A/CII • Both Types use Measuring cell with floating sensor • Floating silicone sensor in the cell neck, to improove the static pressure, overload and temperature characteristics. • Protection diaphragm in the cell body allows an overload pressure corresponding to the maximum static pressure without damage of the sensor. www.coulton.com

  8. Pressure transmitters FCX-A/CII • Capacitance silicone sensor • The micro machined silicone sensor is based on the capacitance measuring principle. Capacitance C1 & C2 change with applied differential pressure. • Cell protected from temperature variation by silicon fabrication and minimmal physical size. • Stress forces are balanced by floating cell design. www.coulton.com

  9. Pressure transmitters FCX-A/CII • Matching Convolutions reduce volume Convolutions are machined on the body. Diaphragm is electron beam welded to the body Diaphragm is pressed to body. • Benefits • No damage on over pressure • Improved Temperature Spec • Reduced Stress www.coulton.com

  10. www.coulton.com

  11. ORIFICE PLATE FLOWMETERS • Advantages: • Low cost, especially on large sizes • No need for recalibration • Widely accepted • Disadvantages: • Poor turndown (4:1 typical) • Long installations • Subject to wear. www.coulton.com

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