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The Consumer Guide to
Differential Pressure Flow Transmitters
2nd Edition

Guide Description

The first completely independent consumer guide to differential pressure flow transmitters, ranked by range, by performance, and by supplier (limited to 11 major world-wide manufacturers of differential pressure flow transmitters).

The guide contains technical information about evaluating and applying these transmitters, including pointers for installation, such as fluid, piping, hydraulic, impulse tubing, installation and calibration considerations. Tables include selected features that are available from each supplier, along with their country of origin or source.

This guide is indispensable for designers, engineers, owners and end users of differential pressure flow transmitters. See where your transmitter ranks and use this guide to help you choose your next differential pressure flow transmitter.

 

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Table Of Contents
  • 0.0   Disclaimer
  • 1.0   Executive Summary
  • 2.0   Differential Pressure Flow Measurement
    • 2.1   Principle of Operation of Differential Pressure Primary Flow Elements
    • 2.2   Square Root Relationship Between Pressure Drop and Flow
    • 2.3   Minimum Reynolds Number Constraints
    • 2.4   Principle of Operation of Differential Pressure Flow Transmitters
    • 2.5   Low Flow Characterization
    • 2.6   Measured Quantity
    • 2.7   Typical Applications
    • 2.8   Additional Information
  • 3.0   Differential Pressure Flow Transmitter Technology
    • 3.1   Capacitance
    • 3.2   Differential Transformer
    • 3.3   Force Balance
    • 3.4   Piezoelectric
    • 3.5   Potentiometer
    • 3.6   Strain Gage
  • 4.0   Transmitter Design
    • 4.1   Analog Transmitters
    • 4.2   Digital Transmitters
    • 4.3   Fieldbus Transmitters
    • 4.4   Multi-Valve Manifolds
    • 4.5   Traditional and Coplanar Construction
    • 4.6   Safety Transmitters
    • 4.7   High Static Pressure Transmitters
  • 5.0   Supplier Data
    • 5.1   Process Limits
    • 5.2   Ambient Limits
    • 5.3   Output Signals
    • 5.4   Reference Performance
    • 5.5   Temperature Effects
    • 5.6   Pressure Effects
    • 5.7   Power Supply Effects
    • 5.8   Mounting Position Effects
    • 5.9   Stability (Drift)
  • 6.0   Supplier Data Analysis
    • 6.1   Process Limits
    • 6.2   Ambient Conditions
    • 6.3   Reference Performance
    • 6.4   Operating Effects
  • 7.0   Summary of Analysis
  • 8.0   Differential Pressure Flow Transmitter Performance
    • 8.1   Accuracy Statements
    • 8.2   Calculating Rate Statements
    • 8.3   Measurement Range
    • 8.4   Data Analysis
  • 9.0   Reference Performance
    • 9.1   Primary Flow Elements
    • 9.2   Effect of Transmitter Accuracy on Flow Measurement
  • 10.0   Actual Performance
    • 10.1   Temperature Effects
    • 10.2   Pressure Effects
    • 10.3   Mounting Orientation Effects
    • 10.4   Stability (Drift)
  • 11.0   Supplier Performance Claims
    • 11.1   High Rangedown
    • 11.2   High Turndown
    • 11.3   High Accuracy
    • 11.4   Reduced Calibration Requirements
  • 12.0   Installation Considerations
    • 12.1   Fluid Characteristics
    • 12.2   Piping and Hydraulic Considerations
    • 12.3   Impulse Tubing
    • 12.4   Differential Pressure Flow Transmitter Installation
    • 12.5   Differential Pressure Flow Transmitter Calibration
    • 12.6   Ambient Conditions
  • 13.0   Accessories
    • 13.1   Wetted Parts
    • 13.2   Non-Wetted Parts
    • 13.3   Differential Pressure Flow Transmitter Signals
  • 14.0   Explanation of Attachments
  • 15.0   Differential Pressure Flow Transmitter Supplier Profiles
    • 15.1   The Major Suppliers of Differential Pressure Flow Transmitters
    • 15.2   Other Suppliers of Differential Pressure Flow Transmitters
  •  
  • Attachments
    •   Availability of Selected Features
    •   Reference Accuracy and Expected Installed Accuracy
      • 0-12.5 mbar (0-5 inWC)
      • 0-50 mbar (0-20 inWC)
      • 0-100 mbar (0-40 inWC)
      • 0-250 mbar (0-100 inWC)
      • 0-1000 mbar (0-400 inWC)
      • 0-2500 mbar (0-1000 inWC)
  •  
  • About the Authors
Spitzer and Boyes, LLC
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