Thursday, November 9, 2017

Overview of Level Measurement Instrumentation for Chemical and Pharma Applications

stainless steel level transmitter
Nivelco manufactures a broad range of process
instruments for level measurement
Image courtesy Nivelco
Measurements of liquid or bulk solid levels within a tank or other vessel are an integral part of chemical processing. Each application presents its own set of measurement challenges, as well as practical considerations related to safety, environmental conditions, and life cycle cost.

Nivelco manufactures a broad range of instruments utilized for level measurement in industrial process applications. Technologies employed include contact and non-contact variants, along with switches and transmitters.

The brochure included below provides an overview of Nivelco products targeted for use in the chemical and pharmaceutical industries. Share your process measurement and automation challenges with application specialists, leveraging your own knowledge and experience with their product application expertise to develop an effective solution.


Friday, November 3, 2017

Distribution Quality Monitors for Water Systems

distribution on-line water quality monitoring instrumentation
Three versions of water distribution quality monitoring
instrument packages.
Image courtesy Swan Analytical Instruments
Water is an integral part of everyday life, as well as being a primary constituent of many manufactured products. The use and consumption of water brings with it a requirement for a minimum standard of quality for each application. In many instances, the standards of the local water authority or other municipal provider will suffice. When water is sourced outside of the municipal system, or further processing is used to polish the water supply to a higher standard, measurement of specific criteria is needed to assure that the water meets whatever requirements are in place for minimum production and quality standards.

Swan Analytical Instruments, globally recognized manufacturer of analytical instruments for water, integrates instrumentation for several water quality measurements into a packaged unit. Several variants are available, each with its own set of measurement targets tailored for differing application requirements. The Distribution Quality Monitors deliver a complete analytical package on a single frame, saving the customer from having to build up an entire analytical setup on their own. Every component is designed and installed to work perfectly with every other component, for a no hassle path to accomplishing necessary analytical work.

The online monitors can target chlorine, pH, conductivity, and turbidity. An electronics package provides alarms, limit switches, PID control, diagnostic alarms, and dual 4-20 mA outputs from each of three transmitters. The consolidated package embodies years of Swan experience to deliver reliable results with a minimized requirement for human attention.

For more information, share your water analysis requirements and challenges with the process measurement specialists, leveraging your own knowledge and experience with their product application expertise to develop effective solutions.



Tuesday, October 10, 2017

Applying Turbine Flow Meters With Clean Liquids and Gases

turbine flowmeter flow meter with flange connections
Turbine flow meter
Image courtesy Hoffer Flow Controls
A turbine flow meter provides a volumetric measurement of liquid or gas flow through the use of a vaned rotor (turbine) inserted in the fluid flow path. Fluid movement causes the turbine to rotate at an angular velocity proportional to the flow rate. A pickup senses the passage of the rotor vanes, producing a sine wave electrical signal output which is detected by the unit electronics. The frequency of the signal relates directly to the turbine rotation and fluid flow rate.

Generally, a turbine flow meter is applied to measure unidirectional flow. Some turbine flow meters, through the use of two pickups, have the capability to measure flow in both directions.

There are a number of considerations when selecting a turbine flow meter:
  • Material of construction: Numerous material options are available for the housing and internal parts. Proper selection considers media characteristics and cost.
  • Bearing selection: The combination of bearing type and material will likely be selected by the device manufacturer, based upon a comprehensive application information set.
  • Pickup selection: Several pickup options may be available, with the manufacturer making a recommendation that best suits the application parameters.
Here are a few other things to consider about applying turbine flow meters:

  • Turbine flow meters are precision instruments and will not tolerate debris well. An installation should include a strainer configured to trap debris that may damage the instrument or hinder its operation.
  • For longevity, it is advisable to size the flow meter to avoid extended operation near the upper end of its rotational range. Excessive rotational speeds can accelerate wear on bearings.
  • Lower rotor mass will provide more rapid response to changes in flow, allowing use of the device in applications with flow pulsations.
  • Maintain sufficient downstream pressure to prevent flashing or cavitation. This condition will cause the instrument to produce readings higher than the actual flow rate.
  • Sufficient straight pipe length should be installed at the inlet and outlet of the flow meter to provide flow conditioning necessary for accurate readings. In some cases, a flow staightener may be needed on the upstream side.
  • The output signal from the pickup may need amplification or other signal conditioning. Electrically noisy environments or long cable lengths may require special treatment.

Careful consideration of what is necessary for proper operation will pay off with reliable and accurate performance, low maintenance, and a long service life. Share your flow measurement challenges with product application experts, combining your process knowledge with their product application expertise to develop effective solutions.



Wednesday, October 4, 2017

Load Cell Application in Process Measurement

load cell industrial weighing module
Load cell incorporated into an industrial weighing module
Image courtesy of BLH Nobel
In industrial application of process measurement and control, principles of the physical sciences are combined with technology and engineering to create devices essential to modern high speed, high accuracy system operation. Years of research, development, and the forward march of humanity’s quest for scientific knowledge and understanding yields packaged devices for process measurement that are easily applied by system designer and operators.

Load cells are the key components applied to weighing component or processed materials in modern processing. Load cells are utilized throughout many industries related to process management, or just simple weighing operations. In application, a load cell can be adapted for measurement of items from the very small to the very large.

In essence, a load cell is a measurement tool which functions as a transducer, predictably converting force into a unit of measurable electrical output. While many types of load cells are available, the most popular cell in multiple industries is a strain gauge based cell. These strain gauge cells typically function with an accuracy range between 0.03% and 0.25%. Pneumatically based load cells are ideal for situations requiring intrinsic safety and optimal hygiene and, for locations without a power grid, there are even hydraulic load cells, which function without need for a power supply. These different types of load cells follow the same principle of operation: a force acts upon the cell (typically the weight of material or an object) which is then returned as a value. Processing the value yields an indication of weight in engineering units. For strain gauge cells, the principle of deformation applies, where extremely small amounts of deformation, directly related to the stress or strain being applied to the cell, are output as an electrical signal with value proportional to the load applied to the cell. The operating principle allows for development of devices delivering accurate, precise measurements of a wide range of industrial products. Advantages of load cells include their longevity, accuracy, and adaptability to many applications, all of which contribute to their usefulness in so many industries and applications.

A common place to find a strain gauge load cell in use is off a causeway on a major highway at a truck weigh station. Through innovation, load cells have been incorporated in an efficient measuring system able to weigh trucks passing through the station, without having each stop. Aircraft can be weighed on platform scales which utilize load cells, and even trains can be weighed by taking advantage of the robust and dependable nature of the transducers. Thanks to their widespread incorporation and the sequential evolution of technology, load cells are a fantastically useful tool in process measurement and control.

Share your process measurement challenges with application specialists, leveraging your own knowledge and experience with their product application expertise.

Thursday, September 21, 2017

Magnetostrictive Liquid Level Transmitters

magnetostrictive level transmitters
Different configuration of magnetostrictive level transmitters
Image courtesy Nivelco
The numerous level control technologies, methods, and instruments all have an application range or niche where they provide a feature set and performance advantageous to other measurement means. The particular set of attributes that can push one instrument over the top in the selection process is specific to each user and application.

Magnetostrictive level transmitters provide a continuous signal indicating liquid level in a vessel. They should not be confused with what are called magnetic level gauges, an instrument that locally provides a visual indication of liquid level.

Magnetostrictive level measurement employs a precise measuring of the transit time for an electric pulse travelling on a wire extending down an enclosed tube oriented vertically in the subject media. A magnetized float on the exterior of the tube moves with the liquid surface. The float’s magnetic field interacts with a magnetic field produced along the wire to generate a return signal to the transmitter head. Processing the time from emission to return provides a measure of distance to the liquid surface.

These level transmitters offer good accuracy and ease of installation and maintenance. They are best applied with relatively clean fluids. Media that will impede the free movement of the float along the sensing tube should be avoided. Magnetostrictive level instruments are often employed alongside, or integrated with, a magnetic level gauge. The magnetic gauge provides a local indication of tank level, while the magnetostrictive transmitter delivers a level signal to monitoring and control equipment.

Share your level measurement requirements and challenges with a process measurement specialist, combining your own process knowledge and experience with their product application expertise to develop effective solutions.


Friday, September 15, 2017

New Functional Safety Programmable Loop Display

SIL 3 capablefprogrammable functional safety loop display
SLD Functional Safety Programmable Loop Display
Image courtesy Moore Industries
Moore Industries has introduced a new Functional Safety Loop Display for industrial use. The PC programmable unit monitors and displays real time process status using one of several engineering units specified by the operator. The unit is certified by exida as a SIL 3 capable, non-interfering device for use in a safety loop.

The following excerpt from the Moore Industries blog tells more of the story...

"The SLD features an independently configured display with two rows of large characters that can be clearly read in the field and set to display any EGU, it is loop-powered by less than 2.3 Volts, and the Loop Maintenance Zener Diode Option allows removal from the loop for maintenance without interrupting your safety function. Additional features include RFI/EMI immunity, superior accuracy of ±0.012% of input scale, easy calibration, and superior reliability with up to 5 years between scheduled calibrations.

"The SLD Functional Safety Programmable Loop Display is DTM programmable. Using the Moore Industries’ optional USB communication cable, the SLD can be configured to display the signal how you want to see it using any FDT compliant host or program framework, such as free PACTware. You can even store the configuration you’ve created directly to your computer.

"The SLD is simple to setup with DTM software, allowing the SLD to be custom scaled to display information in percent or scaled directly into engineering units for indicating process measurements such as pressure, temperature, level, or flow. Use the free software to input custom and square root curves in one EGU and have the PC program convert it into a different EGU for display, or easily program span, zero, input range, display range, and filtering frequency. Select square root or linear curve from the library or quickly create a custom one for your use.

"When placed into one of our housings, the SLD has 360° flexible mounting allowing the SLD to be mounted at any angle in nearly any environment. The SLD is a non-interference device and can be taken out of the loop with the –LMD option (Loop Maintenance Diode) without affecting the integrity of the SIF loop. The SLD Functional Safety Programmable Loop Display is the perfect solution to accurately and reliably display process status in a safety loop."


More detail is provided in the datasheet included below. Share your process measurement, monitoring, and control challenges with application experts. Leverage your own knowledge and experience with their product application expertise to develop effective solutions.



Thursday, September 7, 2017

Sanitary Pressure Transmitters

Pressure transmitter Yokogawa EJA530E
The EJA-E Series pressure transmitter features
Yokogawa's DPharp sensing technology
Image courtesy Yokogawa
Sanitary processes have their own sets of governmental and organizational requirements and standards, the goal of which are the delivery of safe products that are unadulterated by contamination. To that end, there are special performance and construction features required for the processing equipment, piping, facilities, and anything that comes in contact with the product or its constituents at almost any stage of production.

Pressure transmitters are a common fixture of fluid processes, sanitary or otherwise. The connection of a pressure transmitter to a sanitary system will generally be accomplished via one of several recognized sanitary connectors. The connectors facilitate the maintenance of sanitary conditions in the process vessel or piping by blocking contaminants from entering the system, establishing a leak free seal at the connection, and not being a source of contamination to the process. Transmitters for sanitary applications must also accommodate CIP and SIP operations where certain chemicals or steam may be introduced to the system for cleaning or reducing bioburden. Installation of the instrument should allow for complete drainage from the connection back into the main process line or tank, while also providing good access to the instrument head for observation, maintenance, or validation.

Yokogawa provides their EJA-E series of pressure transmitters with a range of connection options, including those for sanitary systems. The DPharp sensing technology provides top flight performance and a wide variety of configuration options meet the needs of almost every modern process measurement requirement. Communication options include Fieldbus, Profibus, and HART. The HART option allows the use of Yokogawa's HART Field Communicator which facilitates and streamlines many regular setup and maintenance tasks.

Share your process measurement challenges with instrumentation specialists, leveraging your own knowledge and experience with their product application expertise to develop an effective solution.