Topic: Level & Weighing

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Deaerator Level Control
Can a P Controller Be Replaced With a Linear Function Generator in Controlling the Level on a Deaerator?

Radar Love
Control Talk Editors, McMillan and Weiner, Ask Industrial Measurement Device Expert Ram Ramachandran About the Use of Radar on the Plant Floor

Product Introductions: Alarms,Actuators Transmitters and More
Presenting You The Latest Industry Innovations in Alarms Transmitters, Actuators and More

Radar Technology for Level Measurement
Precise Knowledge of the Grain Level in UCML's Storage Silos Is Essential to Production. Radar Measurement Is the Key

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White Papers: In Depth Research

Guided Wave Radar vs. Differential Pressure Transmitters for Liquid Level Measurement
Author: Magnetrol
Posted: 04/27/2010
Differential pressure transmitters were first implemented in the 1950s but are still one of the most commonly used technologies for measuring liquid level in process industries. In many areas of the industrial level measurement market - including chemical, petrochemical, refining, and electric power generation-differential pressure transmitters have captured the vast majority of level applications; and still represent the largest worldwide sales volume of process level measurement equipment. Their popularity and installed base is so prevalent because DP transmitters are versatile, cost-effective, and due to their long history, plant personnel are familiar with their operation.

Over the years, however, newer level measurement devices have emerged and are consistently capturing market share from older technologies which utilize mechanical and pressure-based measurement-including DP transmitters. Technologies such as Non-Contact Radar, RF Capacitance, Ultrasonic, Magnetostrictive, and GuidedWave Radar employ the latest microprocessor-based digital electronics. By incorporating internal diagnostics, these devices have improved the control, analysis, communication, and overall reliability of fluid level management systems

Although DP transmitters presently remain the dominant instrument for level measurement, their worldwide market share is expected to steadily erode in the presence of growing demand for the newer level measurement technologies. Manufacturers, keenly aware of the market shift at play, are allocating significant research and development assets to ensure that these newer technologies continue to offer additional performance, functionality, affordability, and ease of use.

Leading the assault is GuidedWave Radar (GWR), which is among the most versatile of technologies now being used for liquid level measurement. It is also one of the newest and fastest growing technologies, having gained tremendous acceptance due to the significant advantages it offers over other level measurement devices. Not only does GWR usually outperform conventional level measurement technologies, a GWR radar transmitter is extremely compact and easy to install and operate. The latest generation of GuidedWave Radar transmitters is a formidable contender as a potential market-wide replacement to the universally entrenched differential pressure transmitters.

Information on the Amperometric Measurement of free Chlorine, Chlorine Dioxide and Ozone in Water
Author: Dr. Jürgen Schleicher, JUMO
Posted: 10/30/2008
For reasons of hygiene, drinking water, or any other water that people come into direct or indirect contact with, often has to be treated with compounds that destroy any micro-organisms contained in it. Chlorine, chlorine compounds or ozone are very often used as disinfectants. In this sensitive area, a high level of safety for the consumer is an absolute requirement, and for this reason, systems are used for fully automatic monitoring, control and recording of the disinfectant concentration.

Amperometric sensors provide the best means of monitoring the disinfectant concentration. This technical publication will present the electrochemical fundamentals and the application technology of such sensors in an easily understood form, for the interested reader.

Information on Measuring Ammonia in Water
Author: Dr. Jürgen Schleicher, JUMO
Posted: 10/30/2008
Measurement of the concentration of ammonia in aqueous solutions is a requirement in many application areas, such as for coolant monitoring and laboratory measurement. A fast and simple way of measuring ammonia can be achieved by using a membranecovered, gas-sensitive sensor that operates on a potentiometric principle.

But for successful measurement, several factors must be observed when handling and using of ammonia sensors. This brochure is intended to provide practical help for the users in these matters. A special emphasis is placed on the two application situations mentioned above.

Furthermore, the construction and mode of operation of the sensor is also briefly described.

Information on the Measurement of Hydrogen Peroxid and Peracetic Acid
Author: Dr. Jürgen Schleicher, JUMO
Posted: 10/30/2008
The methods of determination of hydrogen peroxide and PAA are not continuous measurements methods, but methods whereby the concentration is measured for samples taken at certain times.

These analytical methods are laboratory procedures requiring a considerable outlay in personnel and time.

In order to regulate the concentration of a disinfectant, it is advantageous if a electrical signal is available that is continuous and proportional to the concentration of disinfectant. This signal can then be used as the input signal for controlling a disinfectant metering system, i.e. the concentration can be completely automatically regulated.

A membrane-covered amperometric measuring cell can be used for monitoring the peracetic acid concentration and the concentration of hydrogen peroxide.

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Timeless Resources

Field Instrumentation Technical Handbook Field Instrumentation Technical Handbook is a useful compendium of physical constants, tables and information no engineer responsible for field instrumentation should be without. It has been required reading in many companies for many years. Download your free copy now.