Monday, June 27, 2016

Sodium Analysis for Industrial Operations

industrial process sodium analyzer in enclosure
Model 2111XP Sodium Analyzer
Courtesy Thermo Fisher
Sodium, because of its pervasiveness and reactivity with other materials, is often a concern in industrial processes. The production of demineralized water is a common application for sodium analysis, as well as monitoring of boiler feedwater, steam condensate, and many other process water streams.

Thermo Fisher's Orion™ brand line of sodium analyzers has been the preferred choice for industrial applications in the power, semiconductor, chemical, petrochemical, pulp and paper markets because of the products' unmatched reliability at analyzing sample streams. Some other applications within these industries include:

  • Process Feedwater and make-up water
  • Boiler feedwater
  • Drum boilers
  • Demineralized water
  • Steam condensate
  • Cation exchange breakthrough
  • High acid sample analysis
I have included a data sheet for the Orion™ Model 2111XP Sodium Analyzer which provides illustrations, options, specifications, and a general overview of the benefits that come with the unit. More information is available from product specialists to provide solid solutions to your sodium analysis and other water quality monitoring challenges.

Wednesday, June 8, 2016

Level Measurement - Simple Accurate Bubbler Method

diagram of instrument arrangement to measure level using bubbler method
Instrument layout for level
Measuring liquid level in a tank or vessel can be accomplished in a number of ways, all of which require some arrangement of instrumentation to either infer the liquid level from the measurement of a related physical property, or directly deliver the liquid level visually using a scaled gauge arrangement. One indirect method of level measurement is often referred to as the bubbler method, so named because it employs a purging gas that continually vents from the bottom of a tube extending into a tank of liquid. Through a simple apparatus, the level of a liquid can be inferred by the amount a back pressure exerted upon the gas flowing through the tube.

Probably the greatest advantage of this method of liquid level measurement is that the liquid does not contact the sensing instrumentation. The only portion of the apparatus in contact with the liquid is a tube immersed into the tank. Basically, a purge gas flows through the immersion tube and may bubble out the immersed end of the tube, which is open to allow the contained liquid to exert a hydrostatic pressure on the purge gas. The back pressure on the gas that is exerted by the liquid contained within the tank will vary directly with the depth of the liquid. The back pressure can be correlated to a liquid level. The accuracy of the measurement is related to the proper regulation of the purge gas (explained in the application note below) and the measurement capability of the pressure transmitter. Once the depth of the liquid is derived, further calculations, employing tank shape, dimensions, and the liquid density can provide an indication of the volume and mass of the liquid. Here is an illustration of the setup, provided courtesy of Yokogawa, a recognized leader in flow and pressure measurement with a global presence. Included below, an application note from Yokogawa on applying rotameters to the setup, as well as data sheets for the instruments employed in the illustrated apparatus.

Share your level measurement challenges of all types with the application specialists at Classic Controls. Combining your process expertise with their product application knowledge will yield the best process measurement and control solutions.

Wednesday, June 1, 2016

Selecting and Using the Right Temperature Sensor

Temperature measurement is an ubiquitous primary element of almost every fluid process control operation, as well as a host of other industrial applications. Selecting and properly applying a temperature sensing technology is key to effective process measurement. Of the two common technologies, RTD and thermocouple, each has advantages under a certain set of operating conditions, and it is useful to be familiar with the basics of how they work and how they should be applied.

Pyromation, a long standing manufacturer of temperature measurement devices for industrial and scientific applications, provides us with a useful white paper detailing thermocouple and RTD operation, as well as the strengths and weaknesses of each in application.

Read the white paper. Share your process temperature measurement challenges with a product specialist. Combining your knowledge of the application with their knowledge of the products will produce the best solution.