Showing posts with label process control. Show all posts
Showing posts with label process control. Show all posts

Thursday, August 2, 2018

Operating Principles of the Jogler Model ILT-6000 Magnetostrictive Level Transmitter

The Jogler ILT-6000 Direct Insertion Magnetostrictive Level Transmitter is a loop powered non-contact level measurement device that can be installed directly into a process vessel. Utilizing the magnetostrictive principle and time-of-flight calculations allow the ILT-6000 to provide a fast and accurate measurement of float position and, ultimately, liquid level in the gauge. The ILT-6000 is installed in an isolation well assembly allowing the transmitter to be removed, serviced, or replaced with no process interruption.

The video below briefly explains how it operates:


ILT-6000 FEATURES
  • 2 wire, loop powered (24VDC nominal)
  • LCD Display (4-20mA, %, in, and/or cm)
  • Generic HART communication
  • Quick-Cal function for simple recalibration
  • Isolated from process pressure
  • Long Measuring Lengths (up to 35ft)
  • Isolation Well assembly
  • Dual level outputs (total level and interface)
  • Epoxy-Coated Aluminum Enclosure
  • Class I, Division 1, Groups A, B, C, D
  • Class II and Class III, Division 1, Groups E, F, G
  • Class I, Division 2, Groups A, B, C, D
  • Class II and Class III, Division 2, Groups E, F, G
  • Intrinsically Safe Class I / II / III, Division 1, Groups A, B, C, D, E, F, G
  • NEMA 4X
630-321-9646

Monday, June 18, 2018

Thermocouples for Process Measurement

Thermocouples for Process Measurement
Industrial Thermocouples
A thermocouple is a device which functions as a temperature sensor. Two wires, made of dissimilar metals, are joined together at both ends. The thermocouple is, at this point, a thermoelectric circuit with current flowing in relation to the temperature at each junction.  The temperature of one junction is known and constant, called the cold junction. The other junction is placed in contact with the media or object to be measured. The closed circuit of the thermocouple subsequently gets broken at the center, and the open circuit voltage from the hot junction is a direct function of the junction temperature. Heating or cooling the sensing junction of the two metals produces a voltage directly correlating to the temperature.

Industrial ThermocouplesThere are a number of metal combinations used to produce industrial thermocouples. Each combination has a respective set of performance attributes, operating temperatures, tolerances, and cost that may deliver best performance for a particular use.

Common Thermocouple Types and Composition

  • Type J (Iron / Constantan)
  • Type K (Chromel / Alumel)
  • Type T (Copper / Constantan)
  • Type E (Chromel / Constantan)
  • Type N (Nicrosil / Nisil)
  • Type B (Platinum / Rhodium)
  • Type R (Platinum / Rhodium)  

Generally, thermocouple sensor assemblies, often a tube enclosing the thermocouple junction, can be grounded, ungrounded, or exposed. The wires constituting the tip of a grounded probe are attached to the inside of the probe wall, allowing for maximal heat transfer through the probe wall to the junction while maintaining a physical separation between the junction and the measured media or object. The difference between grounded thermocouple probes and ungrounded thermocouple probes is that in ungrounded probes, the junction is not attached to the probe wall. For this reason, ungrounded probes can exhibit slower response time, but do provide electrical isolation of the junction from the housing. An exposed thermocouple will have the junction protruding from the probe tube or perforations in the tube to allow actual contact between the measured material and the junction. While this provides very rapid response, the junction is exposed to damage and wear.

Thermocouples
Various Thermocouple Styles
Thermocouples are useful for process measurement due to their size, response, ruggedness, accuracy, cost, and wide range of available form factors. Chemical and petroleum refineries, as well as other fluid processing operations, can use multiple thermocouples to control, limit, test, log, and monitor process-related temperatures. Temperature is one of the most measured parameters in industry. Understanding the temperature range being measured, the accuracy level required, and the related process vibration concerns of each industry will aid in selecting the proper thermocouple for an application. When properly matched to the application requirements, thermocouples are a durable and cost-effective process measurement option.

Download your temperature sensor selection catalog here.

Contact Alliance Technical Sales with your temperature sensing requirement. Their application engineers will help you select the best sensor for the job.

Tuesday, May 1, 2018

Features of Magnetic Level Gauges (Magnetic Level Indicators)

Magnetic Level Gauge
Magnetic Level Gauge
(Jogler)
Magnetic level gauges, also known as magnetic level indicators, are routinely used to provide a display of liquid level in tanks and other vessels. Their popularity stems from their high visibility from distances and non-invasive design which reduces the possibility of leak points and the risks of fugitive emissions.



"Mag Gauge" construction is fairly simple. A magnetic float, designed for the specific gravity of the material being measured, rides inside a vertical pipe on top of the process media. A gauge with magnetically coupled visual indicator is fastened to the pipe. As the media inside the pipe rises and falls, the visual indicator moves in the same fashion.



Magnetic level gauges are often employed in tandem with magnetostrictive, guided wave radar, or other measurement means to provide a reliable local display of liquid level, as well as an electrical signal that can be transmitted to recording instrumentation or controllers.


The features of magnetic level gauges include:
  • Low maintenance. 
  • Wide operating temperature and pressure range.
  • Visual tank level indication. 
  • Continuous level measurement.
  • Easier to read from greater distance than glass sight gauges. 
  • Can be applied to wide fluid level ranges with a single instrument. 
  • Break resistant, sturdy.
  • Wide range of construction materials available.
  • External mounting of ancillary indicators, switches, and transmitters with isolation from process media. 
  • No electric power required for operation.

There are a number of options available so you can customize the level indicator for each specific application.  The best way to proceed is to combine your process knowledge with that of a product specialist.  Collectively, you'll be able to achieve an effective solution to your application challenge.

Wednesday, March 28, 2018

Magnetostrictive Level Transmitter

magnetostrictive level transmitter
Magnetostrictive level transmitter
Image courtesy Jogler, LLC
Physical properties of certain materials can be applied using ingenuity and creativity to create useful appliances. Magnetostriction, a physical property of ferromagnetic materials, produces a change in shape or dimension in the subject material when it is magnetized. This basic principle is integrated into a liquid level transmitter by extending a sensing wire along the interior length of a tube immersed in a process tank or other vessel containing the liquid to be measured. The transmitter pulses the sensing wire with an electrical current, creating an electromagnetic field. A magnetic float, travelling along the outside of the sensing tube, rises and falls as the liquid level in the tank changes. As the float moves along the length of the sensing tube, it creates a torsional stress in the sensing wire, starting at the position of the float, which matches the level of liquid in the tank. A sensing element converts the torsional stress in the wire to an electrical pulse. The transmitter measures the time differential between the initial pulse it sent down the sensor wire and the pulse resulting from the torsional stress and then calculates the position of the float and the liquid level.

These devices are very accurate and operate on a standard 2-wire loop. There are numerous options and variants that allow configuration for each application.

More information is included in the data sheet below. Your best source for current product and application information is a product specialist. Combining your process knowledge with their application expertise will produce the best outcomes.


Friday, December 22, 2017

Alliance Technical Sales Wraps Up a Good Year

automated process control room
Alliance Technical Sales, like every other business, is finishing out 2017. Everyone at ATS is thankful for the support and opportunity provided by our customers and suppliers.

The company made some changes to its product lineup during the past year, expanding the range of application solutions available.


We also continued our program of product training and education to maintain top flight competence in recommending solutions to our customers' process measurement and control challenges.

Thank you, again. We look forward to the upcoming year and providing service to our customers at all levels.


Friday, December 15, 2017

Sight Flow Indicators

armored direct read flow indicator
Armored flow indicator provides direct visual reading
of process media flow.
Image courtesy Jogler, LLC
In the operation of an industrial process, there may be instances where a visual confirmation or assessment of fluid flow is useful or necessary. In those cases, a direct reading sight flow indicator is just the thing needed to fill the requirement.

The sight flow indicator is essentially a clear tube with an encasement and appropriate connections that facilitate the indicator's installation into a process piping system. It is installed in a manner that provides an operator visual access to the inside of the piping at that location. Further details about construction materials, armoring, and more will round out the product selection that best accommodates the industrial environment, the media, and the visual inspection needs.

Jogler manufactures a range of flow, level and analytical instruments for industrial use. Their sight flow indicators, with line sizes from 1/2 to 4 inches and lengths up to 60 inches, enable a process operator to get that all important look at the liquid media as is passes through the flow indicator. The presence, color and character of the media can be assessed visually through the flow indicator, delivering visual confirmation of some targeted aspect of the process.

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


Friday, December 1, 2017

Interchangeable Humidity Probes Open Up Application Possibilities

humidity measurement instrumentation
The Vaisala Indigo series of humidity measurement probes
encompasses variants for a wide range of applications.
Image courtesy Vaisala
The Indigo family of smart sensors and transmitters, from Vaisala, has been expanded with some newly released humidity probes. The five new probes can be used with an Indigo host device or another using Modbus protocol. Previously available sensors measured concentrations of gaseous carbon dioxide and hydrogen peroxide. The new offering expands the Indigo functionality into humidity measurement, a mainstay of Vaisala for many years. Humidity can now be measured in:

  • Pressurized or high pressure environments, up to 100 bars, with two probe offerings covering differing pressure ranges
  • High temperature ovens and similar applications
  • High humidity applications where probe heating is required
There is also a new version available for temperature measurement. 

The Indigo family of sensors and host devices are interchangeable, and all can interface with Vaisala's Insight PC software. More information is available from the process measurement specialists at Alliance Technical Sales. Share your process measurement challenges with experts, leveraging your own knowledge and experience with their product application expertise to develop the best solutions.

Thursday, February 16, 2017

Software For Bioreactors and Batch Processing Pulls Everything Together in One Place

pharmaceutical batch operation with operator
Bioreactors and other batch operations can require the integration and coordinated operation of multiple control loops, data collection and processing, and the equipment and instruments sourced from differing manufacturers. Operations such as these can benefit greatly from productivity improvement afforded by expert level software that automates and coordinates the tasks involved in batch processing.

ILS Automation, a leader and specialist in software and hardware targeted at the automation of batch processing, provides their Batch Expert+ software which allows operators to maximize productivity throughout the entire process. The company takes an open non-proprietary approach to providing solutions for complex batch processing. In the company's own words (from the ILS website) Batch Expert+ software offers:
  • Adaptable: Customers can customize a system to meet their needs both now and in the future. Software features are often added to meet the ever-changing needs of process development or the introduction and integration of new measurement technology. 
  • IoT Approach: We apply the notion of the Internet of Things (IoT) to laboratory automation. Our controllers integrate smart control elements and instruments in smart ways. Often this implies a digital interface to read and write actual numbers instead of an analog 4-20 mA approximation. Richer and more accurate/precise data is presented for data analysis and automation. Be it gas flow controllers (Alicat and Brooks), digital probes (Mettler ISM, Hamilton Visiferm), scales (Mettler, Sartorius, OHAUS, etc.), cell density (Hamilton Incyte, ABER, Fogale), the IoT approach provides smarter solutions.
  • Open: ILS first-and-foremost provides solutions — not just a piece of equipment that is unpacked from a box. To achieve this goal, we don’t hide behind proprietary equipment or software that is rigid and would conform to our thoughts of what our customers need. Our platforms grow and scale to adapt to customer needs through an open software and hardware system based on industrial grade, off-the-shelf components.
  • Remote Support: ILS often supports our customers through a remote VPN connection (LogMeIn, Citrix Receiver, etc.). Our customers claim that we have an obsession with bioreactor control and performance tuning. Combining our AFC controller with our BE+ platform, the slightest DO oscillation or anomaly spurs our interest. Through this interaction and customer feedback, we continually learn and improve our products and solutions. Also, we are often not on-site when questions and issues arise just before a 5:00 pm Friday inoculation, so any automation to help the end users is greatly appreciated.
There is more to learn about Batch Expert+ and how it can be incorporated into your own operations. Share your processing challenges with a product specialist, combining your process knowledge with their product application expertise to develop an effective solution.


Wednesday, February 1, 2017

Create a Customized On/Off Process Control Unit

In control theory, an on/off controller is a feedback controller that switches abruptly between two states. It is often used as a control method for a process which can tolerate ongoing change in the process value within a band, referred to as the hysteresis. A common example of an on/off temperature control operation is a residential thermostat. They control the temperature of your home, turning off the heating or cooling system at your comfort setting, waiting for some significant change to occur, then turning on again to eliminate that difference. The process cycles continually. Many process operations can utilize simple on/off control action to maintain suitable conditions.

sanitary temperature transmitter RTD
Temperature Transmitter
Courtesy Smart Sensors
A PLC (programmable logic controller) can be a good candidate for creating your own on/off temperature controller with specialized additional functionality that suits your process. Implementing the temperature control operation is not difficult, and the use of a PLC allows the designer to integrate other useful functions into a single piece of hardware, functions that might not be available in a commercially available process controller.

The primary input device will be a transmitter with analog output compatible with the analog input on the PLC. For this discussion, let's assume this is a temperature control application that requires heating of the process. So, a temperature transmitter will be our primary input device. The primary output device will be a heater contactor or other power control device, the input of which must be compatible with the output of the PLC. Any other switches, pilot lights, alarms, or other devices will need to also be associated with a compatible PLC I/O point. 

The logic portion of the temperature control activity is not complex. The input signal from the temperature transmitter is converted to a working value. Depending upon the numeric muscle of your PLC, this value may be a floating point number, but integer values work suitably. Here are the logic steps needed.

  • Read temperature input value
  • Is temperature greater than or equal to the setpoint? If yes, turn off output for heater and proceed to the next step. If no, go to next step.
  • Is temperature less than or equal to the value of setpoint minus a deadband value (more on deadband below)? If yes, turn on output for heater. If no, continue to other commands that provide your additional desired functions.
Here are some points to consider.
  • Use a greater than or equal to, or less than or equal to comparison to assure that all possible numeric scenarios for process temperature are handled.
  • Deadband is a value that you employ to keep your control output from chattering rapidly between the on and off state when the process value is very close to the setpoint. It can also be used, in this case, to slow down the on/off switching of the heater and reduce wear on a mechanical contactor. Keep in mind that a 16 or 32 bit number, which is what the PLC will use for internal processing of your temperature reading, may actually pass across the setpoint value rapidly, even though a digital display of temperature will appear to be relatively stable. The constantly changing values would cause rapid changes in the output if the comparison logic did not include a deadband value. The use of a deadband creates a range of process temperature where no change in the output occurs. 
  • For this particular application, with its heating action, a separate limit control is advised. The device should derive its input signal from a source other than that of the PLC and the output of the limit control should provide a positive means of de-energizing the heater.
  • Other functions easily programmed into the PLC include alarms, pilot lights to reflect heating activity, an on/off switch for the process, and other items limited only by your ingenuity.
Not every process needs PID control. This illustration focused on temperature, but the principles are the same for almost any process. A modestly powerful PLC can provide the processing power, and input devices for temperature, humidity, moisture, pH, liquid level, flow, pressure, and more are available. Share your challenges with a process measurement specialist and develop an effective customized solution for control of your process.

Friday, January 27, 2017

Intelligent Management for Process Sensors

Process analytical sensors can require scrupulous levels of attention and maintenance to continually deliver optimum performance. In some cases, overly frequent or involved maintenance is performed in order to avoid problems. Mettler Toledo, globally recognized leader in the development of process analytical sensors, developed a solution to streamline sensor maintenance and maximize reliability and performance.

The iSense software suite supports Mettler Toledo's line of intelligent sensors, monitoring and documenting sensor performance while maintaining real time indications of time to maintenance and calibration. Essentially, the iSense software provides guided sensor maintenance and continually verifies the operational health of the sensor to assure that delivered data is accurate and reliable.

There is much more to learn about how the iSense software and comprehensive offering of intelligent sensors can enhance process performance, as well as the efficiency of analytical operations. Reach out to a process analytics specialist with your analytical measurement challenges. Combining your process knowledge and experience with their product application expertise will yield an effective solution.


Thursday, January 19, 2017

Improve Liquid Processing Performance With Sensor Technology

In the field of industrial processing, there is always a striving for improvement. Increasing output, improving output, and decreasing resource input are the watch phrases for process designers and operators in every industry.

Liquid processing often involves analytical instruments that produce periodic or continuous measurements of process conditions. The accuracy of these instruments will directly impact the quality and efficiency of the process, so great attention is paid to maintaining sensors and related instrumentation in top working order. Mettler Toledo, globally recognized leader in analytical sensor technology, provides a comprehensive solution for liquid analytical operations with its line of smart sensors and companion management software.

The ISM sensor technology couples the sensor with an onboard processor that continuously monitors sensor performance and delivers real time information about accuracy and time before maintenance. This empowers users to efficiently schedule maintenance tasks and operate with assurance that the data delivered by the sensor is reliable.

The video below sums up the ISM sensor benefits in under one minute. Share your process analytical challenges with application specialists and combine your process knowledge with their product application expertise to develop effective solutions.


Wednesday, December 21, 2016

Technical Reference for Thermocouples and Reistance Temperature Detectors (RTD)

industrial temperature sensor transmitter with mounting flange and head
One of many industrial
temperature sensor
configurations
Smart Sensors, Inc.
Temperature measurement is probably employed in process control more than any other physical property measurement. Methodology for temperature measurement is well established, as is the industry providing instruments and devices for acquiring temperature data from almost any facet of any process. If you are even peripherally involved in process measurement and control, having a solid understanding of how thermocouples and RTDs work is a requisite to solving problems or servicing customers.

One manufacturer of a comprehensive line of thermocouple and RTD assemblies, Smart Sensors, Inc., produced a technical manual with all you need to know about temperature sensors for process measurement and control. The manual is included below for easy reference. It covers:

  • Thermocouple theory
  • RTD and thermocouple specification criteria
  • Cable specifications for both sensor types
  • Comparison of thermocouple and RTD attributes
  • Thermowell and protection tube specification and selection
  • Specifying temperature sensors for hazardous areas
  • Reference data tables for both sensor types
  • Practices for improving temperature measurement
  • Calibration
The tech manual should be on the shelf or cloud drive of anyone involved in accomplishing, interpreting, or maintaining temperature measurement. The configuration options for temperature sensor assemblies are extensive. Reach out to a product application specialist and combine your process knowledge with their product application expertise to develop effective solutions to temperature measurement challenges.




Wednesday, December 7, 2016

Alliance Technical Sales Overview

industrial engineers consult with product specialist
Alliance Technical Sales works with customers
to develop effective solutions to process measurement
and control challenges.
Alliance Technical Sales represents and distributes for a number of process measurement and control equipment and instrument manufacturers throughout the midwest United States. A specialty of the company is in-line liquid analytical solutions, along with other related fields.

The professionals at Alliance combine world class products with real application expertise and passion to be the best at what they do. For over 15 years, the company has been helping its customers boost efficiency, safety, and effectiveness.

The company's current product offering is included below. Reach out to Alliance Technical Sales for a partner in solving your process measurement and control challenges.



Monday, October 24, 2016

New Website Design for Alliance Technical Sales

home page of website for alliance technical sales
Alliance Technical Sales has a redesigned website
Alliance Technical Sales, manufacturer's representative and distributor of industrial process measurement and control equipment, has released a newly designed website which brings new functionality and easy navigation for visitors.

The newly designed site provides simple and rapid access to technical information regarding an array of process measurement and control products. Direct links to represented manufacturers is provided, as well as simple contact avenues to get visitors information quickly. The site is mobile friendly, adjusting its layout to accommodate whatever device the visitor is using and provide easily readable page views.

ATS now has an ongoing social media presence, with weekly blog posts about products and technical issues. All of the social media channels are directly accessible from the website.

Alliance Technical Sales is fully committed to providing top flight service to its customers. Visit the new website and reach out to ATS with your process measurement and control challenges.

Wednesday, October 5, 2016

Magnetostrictive Level Transmitter Retrofit to Magnetic Level Gauge

magnetic liquid level gauge fitted with low profile magnetostrictive transmitter
This magnetic level gauge has been fitted
with a magnetostrictive transmitter to
provide a continuous process level signal
Jogler
A magnetic liquid level indicator provides a reliable and highly visible reading of its indirect level measurement in tanks and vessels. While useful for local visual indication of tank level, the instrument does not provide an electrical signal output that can be utilized for process control or other monitoring functions. Several magnetic level gauge manufacturers offer combination units that incorporate another measurement technology to provide an analog signal corresponding to liquid level.
What if your installation has an existing magnetic level indicator and you need an analog level signal?
One manufacturer, Jogler, offers a magnetostrictive level measurement instrument that can be retrofitted to an existing magnetic level gauge, even those from other manufacturers. The low profile waveguide mounts slightly away from the existing magnetic level unit to isolate it from temperature and vibration. It is specifically designed for use with an existing magnetic level indicator and provides an analog output signal that is accurate, stable, and responsive.

A magnetostrictive level measurement instrument employs a magnetic float that moves along a sensing wire as the tank level changes. Fixed interval current pulses are sent down the wire, with the resulting electromagnetic field being interrupted by the magnetized float. This interruption causes magnetostriction in the sensing wire, which is manifested as a torsional stress wave along the wire. A piezoceramic sensing element converts the torsional stress into an electrical signal and the transmitter produces an output signal based upon the time interval between the initial pulse and the return pulse produced as a function of the float position.

There is more to be learned, so share your liquid level measurement requirements and challenges with instrumentation specialists. The combination of your process knowledge and their product application expertise will produce effective solutions.



Tuesday, July 26, 2016

Real Time Direct Process Monitoring With Optical Spectroscopy

optical spectroscopy unit for real time process measurement
Optical spectroscopy unit for real time process measurement
Courtesy Prozess Technologie
Measurement and monitoring of process conditions is an essential part of producing the desired output. Some operations require, or can benefit from, faster or more accurate measurement of process variables. This can be especially true for chemical processes that rely on accurate mixing of components.

Process analyzers are available in a wide variety of technologies, configurations, performance ranges, and price points. Selecting the best analyzer for a particular process, take into consideration these points.

  • Technology - Assess whether the technology is cabable of producing the results needed
  • Accuracy - Measurement at levels appropriate for the process and operating goals
  • Specificity - Ability to reliably measure the subject components
  • First cost
  • Continuing costs of maintenance, expendables, calibration
  • Ease of use and integration into overall process measurement and control scheme
  • Reliability
One manufacturer, Prozess Technologie, approaches process analysis with their Reveal optical spectroscopy analyzer. It is capable of operating continuously without ongoing operator interaction. Internal calibration software provides stability and reliability. The software suite for the instrument is compliant with numerous standards and a host of communication standards are supported to allow for easy integration into a process measurement and control system.

Pick up more detail about the Reveal unit below. Share your analytical process challenges with a product application specialist. Combining your process knowledge with their product expertise will produce effective solutions.



Tuesday, July 12, 2016

Paths for Optimizing Chemical Industry Processes

Ingold pH probes for analytical processing
Ingold brand InPro pH probes
Courtesy Mettler Toledo
The success of an industrial process hinges upon simultaneously or continuously maintaining an array of variables within a comparatively narrow operating band. Operators rely heavily upon sensing and measuring equipment to provide critical information about process operation that cannot be gathered by the human senses.

There is a robust section of the measurement and control equipment industry devoted to analytical measurements for chemical processes. Mettler Toledo, with their Ingold brand of analytical instrumentation, has been a key player in the process analytical field for many years. Through continuous research and development, the company has innovated products that provide greater performance and operational benefits to their industrial process control customers.

The piece included below provides a useful overview of the company's analytical and measurement capabilities, with an emphasis on how the products are employed in various industries. Modern technology is incorporated to improve product life cycle performance and reduce maintenance burden.

See for yourself with a browse through the document included below. More information is available on products and applications from a specialist, with whom you should share your analytical process challenges. The most effective solutions will come from collaboration between process operators and analytical equipment specialists.



Thursday, July 7, 2016

When Magnetic Level Indicators May Be Best Choice for Tank Liquid Level Measurement

magnetic level gauge configured for sanitary installation
Magnetic level gauge configured for sanitary installation
Courtesy Jogler
Fluid process control operations often involve vessel or tank storage of liquids. Continuous and accurate indication of the liquid level within the tank is an essential data point for process control decision making and safety. Several methods and instrument types are available for tank level measurement, each with its own set of attributes that may be advantageous for a particular installation. Selection criteria for a tank liquid level indicator may include:
  • Direct or indirect measurement of level
  • Level measurement accuracy and reliability
  • Tank shape, regular or irregular
  • Media compatibility with measurement device
  • Requirements for maintenance or calibration
  • Compatibility with process temperature and pressure range
  • Local display and visibility
  • Level indication signal type and transmission
  • Level alarm switches or other indicators
The selection of a magnetic level indicator, also referred to as a magnetic level gauge, for the project will likely be based upon at least one of the instrument's strengths. Magnetic level gauges have a host of potentially positive features for level indication.
  • Continuous level measurement
  • Operable without electric power
  • Direct visual tank fluid level indication, regardless of tank shape or profile.
  • Wide range of operating temperature and pressure
  • Breakage resistant construction
  • Range of construction materials available to accommodate corrosive media
  • Measuring indicators, switches, and transmitters mounted externally, without contacting the medium being measured.
  • Low maintenance operation.
  • Readable level indication from greater distance than glass sight gauges.
  • Applicable to large fluid level ranges with a single instrument.
Magnetic level indicators have a strong position in the tank liquid level measurement field and should be considered as a candidate for fulfilling those application requirements. There are many options available to customize the level indicator for each specific application. I have included a technical data sheet from Jogler, a manufacturer of level instrumentation, for more detail. Share your application challenges with a sales engineer that specializes in level measurement. Combining your process knowledge with their product application expertise will yield positive solutions.


Monday, June 27, 2016

Humidity and Temperature Transmitters for Demanding Humidity Measurement

Vaisala Humidity sensors and transmitters for process measurement and control
HMT330 Series Humidity and Temperature Transmitters
Courtesy Vaisala
Humidity, the amount of water vapor in the atmosphere or a gas, can be an important measurable attribute of an industrial process. Many are aware of the measurement of relative humidity in HVAC applications and its impact on human comfort in occupied spaces, but the measurement of water vapor in air can be a required measuring point in many other processes that pose far greater challenge.

In addition to common wall or duct mounting applications, where the instrument is easily inserted or placed into the environment to be measured, there are applications that call for special adaptations to the instrument or sensing probe.
  • High pressure
  • Vacuum
  • High temperature
  • High humidity
  • Pressurized pipelines
  • Presence of chemical contaminants
Meeting the full range of industrial process control operations requires stable measurements and the choice of multiple configurations and options to customize the instrument to the process demands. Here are some features worth considering.
  • Multiple variants to match the basic process requirement
  • Full 0 to 100% humidity measurement range up to +180°C (+356°F)
  • PT 100 RTD for accurate temperature measurement
  • Pressure tolerance up to 100 bar
  • Superior sensor accuracy and stability
  • Graphic display and keypad for local operation
  • Multilingual user interface
  • Good chemical tolerance
  • Corrosion resistant housing
  • Delivered with multi-point NIST traceable calibration certificate
  • Analog outputs, RS232/485, WLAN/LAN
  • MODBUS protocol support (RTU/TCP)
  • Long term manufacturer warranty
While not all processes may require, or benefit from, the inclusion of all the listed features and capabilities, reviewing what is available and considering which features may provide better operability in your process can be beneficial. I have included a data sheet below that illustrates the HMT330 Series of humidity and temperature transmitters from Vaisala. Share your humidity measurement challenges with a product specialist. Combining your process knowledge with their product application expertise will produce solid solutions.