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Spirax Sarco Orifice Plate System

Spirax Sarco Orifice Plate System. How they work. Flow. dp. 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. Orifice Plate Output. Flow Error 1:1.

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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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