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Measurement

Introduction to Pressure Measurement

March
2014
Back To Basics
Eugen Gassmann
Pressure-measuring devices come in a wide variety of designs and sizes to suit almost any application. This article describes the basics of pressure measurement and provides guidance on instrument selection.

Wireless Measurement & Control

Virtual Local Section Webinar
Aug 25, 2011
Wireless measurements reduce wiring installation and maintenance costs and eliminate electrical noise and ground loops. The portability of wireless...

Coriolis: The Direct Approach to Mass Flow Measurement

March
2013
Back To Basics
Tom O’Banion
Coriolis meters eliminate the need to measure and correct for pressure, temperature, and density fluctuations to determine mass flowrate. Although their capital costs may be higher, they typically have a lower overall cost of ownership than other types of meters

Diagnosing Maldistribution in Towers

May
2007
Reactions and Separations
Simon X. Xu
Gamma CAT-scan technology makes possible the collection of much more vital online process information than conventional diagnostic techniques.

Assess the Performance of Positive-Displacement Pumps

December
2007
Fluids and Solids Handling
AIChE's Equipment Testing Procedures Committee
Here's how to evaluate rotary pumps— gear, lobe, vane and multiple-screw designs— regardless of whether the material being handled is a Newtonian or non-Newtonian fluid.

Use Guided-Wave Radar to Measure Water Level in Steam Loops

December
2012
Back To Basics
Keith Riley , Ravi Jethra
Guided-wave radar (GWR) is a useful tool for measuring water level in steam loops. This article describes GWR design and operation, and how this technology differs from more traditional forms of level indication.

The Economics of Process Measurements

AIChE Spring Meeting and Global Congress on Process Safety
Apr 2, 2012
What is the economic value of a new measuring device in a process plant – a new analyzer, a more accurate flow measurement, an additional temperature...

The World of Wireless

February
2010
News Feature
Matthew McKeon-Slattery
As wireless technologies have advanced, old limits have been overcome and new challenges have sprung up. Further growth is likely to be driven by specific application and cost-reduction needs. <br>

How Good Are Your Data?

June
2002
Instrumentation
Scott D. Barnicki
Some thoughts on the measurement and interpretation of vapor-liquid equilibrium

Choose the Right Gas Sensor

September
2009
Instrumentation
Sandra Barnes
Selecting a sensor for continuous monitoring involves many considerations. This article discusses the types of sensors available, their applicability and limitations, and how to choose an appropriate sensor to protect people and equipment.

Reliability for Safety Instrumented Systems

September
2004
Instrumentation
J. Patrick Williams
This article offers a detailed reliability-based methodology for determining the safety integrity level of instrumented systems by providing overpressure protection where arrangements of multiple pressure-relief valves are impractical to implement.

Evaluating Chiller Performance

May
2003
Heat Transfer
Charles Churchman
Use these simple temperature and flow measurement techniques to evaluate chilled-utility performance and identify the most cost-effective upgrades.

Understanding Electromagnetic Flowmeters

May
2010
Instrumentation
Ronald W. DiGiacomo
Consisting of a flow tube, field-generating coils, electrodes, and a transmitter, a magmeter accurately measures the flowrate of conductive fluids over a wide range of conditions.

Specifying Laser Scanning Services

May
2005
Plant Design
Eric Hoffman
Increasingly, project managers are called upon to employ laser scanning technology. However, little information available to aid with its specification. This article discusses the basics of laser scanning and the parameters that should be included...

Selecting In-Process Particle-Size Analyzers

August
2003
Fluids and Solids Handling
Paul Barrett
To select the proper instrument for process monitoring, one must determine what attribute of the particle system impacts the process or product parameter of concern. Once the size region is identified, it can be tracked in-process, opening up the...

Use Multivariable Transmitters to Improve Flow Measurement

October
2010
Instrumentation
Nathan D. Stokes
Advances in multivariable transmitters allow more-accurate and more-repeatable flow measurements to be made over a wide range of conditions. Here’s how to select the device with the right capabilities for your applications.

Using Chromatography to Separate Complex Mixtures

December
2010
Back To Basics
Nathalie Fraud
Purifying high-value mixtures, such as pharmaceuticals, can be an expensive undertaking. Choosing the correct chromatography methods can improve purity and reduce processing time and cost.

Avoid Pitfalls in Evaluating Catalyst Performance

July
2001
Reactions and Separations
Daniel G. Loffler
Age and life are not suitable parameters to compare catalyst performance. The proper ones are the rate of reaction and the rate of deactivation.

Exposing Coriolis Mass Flowmeters' Dirty Little Secrets

March
2004
Instrumentation
James R. Reizner
Coriolis technology appears to be the perfect technology. But, upon closer inspection, a key flaw is revealed - the inability to accurately and consistently measure two-phase flow and aerated liquids.

Tracing Process Problems

April
2002
Instrumentation
John E. Hoots
In water chemistry control, fluorescent tracing technology can quickly and effectively determine and deal with the root cause of a problem.

Exploring Instrumentation Alternatives

September
2008
Instrumentation
Robert Baker
Salvaged, remanufactured, refurbished or new-surplus equipment may be a cost-effective option. Here's how to recognize when such devices may no longer meet safety or regulatory requirements.

Measuring Temperature by Direct Contact

September
2011
Back To Basics
Gary Freemer
Thermocouples and resistance temperature detectors are the most common contacting temp­erature sensors. Understand the techniques and apply them correctly to increase your temperature measurement accuracy.

Measuring Temperature by Indirect Means

November
2011
Back To Basics
Gary Freemer
Noncontacting infrared thermometers can be used in many applications that are too harsh or impractical for thermocouples and resistance temperature detectors. Understand their principles of operation and their advantages and limitations to select...

Basic Process Measurements

June, 2009
A unique resource for process measurement Basic Process Measurements provides a unique resource explaining the industrial measuring devices that gauge such key variables as temperature, pressure, density, level, and flow. With an emphasis on the most commonly installed technologies, this guide...

AIChE Equipment Testing Procedure - Particle Size Classifiers, 2nd Edition

June, 1993
This procedure offers complete methodologies for sampling and measuring particle streams and summarizes methods of particle size analysis. It also lists operating variables to be considered and measured. Although the procedure is intended specifically for particle classification equipment, many of...

Reduce Unplanned Shutdowns

September
2003
Instrumentation
Cindy Scott
Today's intelligent devices are equipped with modern alarm technology that enables speedy delivery of critical information to key personnel, thus enhancing efficiency and minimizing downtime.
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