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Tech Update

Get what you measure

By Jaan Koel
Emerson Process Management Rosemount 708 wireless acoustic transmitter and steam trap monitor
The Emerson Process Management Rosemount 708 wireless acoustic transmitter and steam trap monitor decrease steam trap failures and fuel costs by 10 to 20 percent annually. Source: Emerson Process Management.

Endress+Hauser electromagnetic flow meters
Endress+Hauser electromagnetic flow meters are commonly used to measure plant mass balance, water usage and process control. They are accurate (0.2 percent or better), have no moving parts, eliminate pressure loss and are CIP-able. Source: Endress+Hauser.

Siemens's SITRANS LPS200 level paddle
Siemens’s SITRANS LPS200 level paddle switches monitor high and low levels in the gluten hopper at Carr’s Flour Mill in Maldon, UK. Source: Siemens.

Hardy Process Solutions HI LPRC Series
A Hardy Process Solutions HI LPRC Series load cell and mount used in the conversion of a skirted silo to a weigh silo increases accuracy. Source: Hardy Process Solutions.

ABB's electromagnetic ProcessMaster flow meter
Shown in this brewery application, ABB’s electromagnetic ProcessMaster flow meter features self-cleaning and double-sealed electrodes that enhance reliability and performance. Source: ABB.

Emerson Process Management Rosemount 708 wireless acoustic transmitter and steam trap monitor
Endress+Hauser electromagnetic flow meters
Siemens's SITRANS LPS200 level paddle
Hardy Process Solutions HI LPRC Series
ABB's electromagnetic ProcessMaster flow meter
March 5, 2015
The well-known maxim: “You get what you measure” is unarguable in all aspects of business performance including food and beverage manufacturing. Processors want results without a lot of hassle. They want to track processes, deliver on time and on budget, operate sustainably and not worry about recalls. In essence, proper flow, temperature, level, concentration, chemical, color and texture measurements are vital to efficient food and beverage manufacturing.

Article Index:

  • Improving safety and automation
  • Getting the best outcome
  • Providing modularity and connectivity

“The current status of the overall PI [process instrumentation] segment is very strong because everyone is trying to automate their processes to become more efficient and add money to their bottom line,” says Denny Petrovich, food & beverage process sales manager at Siemens Industry Inc. “Instrumentation is the first step in the automation process that provides the sensors, whether they measure pressure, flow, temperature or level. “

According to the Measurement, Control & Automation Association (MCAA), in 2013, sales of process instrumentation and automation (PI&A) in the US grew to about $11.1 billion and $1.2 billion in Canada. MCAA is a North American trade association whose members design, manufacture and distribute instrumentation and systems used in industrial process control and factory automation around the world.

“We project  4.1 percent compound annual growth rate  in the US and 3.5 percent in Canada from 2015 to 2018,” says MCAA President Cynthia Esher. “Growth products are [those that measure] electronic flow and electronic level.”

She also says forecasters have reported the food and beverage industry has invested in productivity for several years and has achieved many of its objectives. “F&B producers have reduced energy consumption and overhead while achieving a 2 percent increase in total output,” she notes. “That growth in output has been accomplished by plant consolidations and automation, without major capital investment in new facilities.”

She adds that capital funds have been funneled to acquisitions, stockholder buybacks and dividends, and growth opportunities in emerging markets. “Productivity improvements will continue to be a focus of F&B annual spending, which will be a moderate 2.5 percent for both the US and Canada,” predicts Esher.


Improving safety and automation

“Healthy living has brought a change to how manufacturers package and label products, as well as how they brand their products to draw in consumers,” says Petrovich. “Process instrumentation can help in aiding these trends by improving safety and automation.”

Siemens offers a broad process instrumentation portfolio and has products such as the LR560 solids level radar device tailored to food applications. One company that benefited from the use of this device is Carr’s Flour Mill in Maldon, UK.

Carr’s is a 24/7 operation that supplies UK supermarkets and bakeries with 54,000 tons of flour every year, enough for 195 million pizzas. The company has 26 silos located in a residential neighborhood, which limits its receipt of truck shipments to daytime hours.

To monitor the silo levels, workers used to climb eight flights of stairs several times a day and used a tape measure to get the level information they needed. To remedy this situation, Carr’s installed a Siemens SITRANS LR560 radar transmitter for solids level measurement on the top of each silo. The transmitters provide continuous level readings through a 4 to 20mA connection to a central location on the ground, so workers no longer have to climb those stairs every day.

After the different parts of the wheat are separated, the “midds” leftovers are stored in three separate silos and then sold as animal feed to local farmers. The midds silos are very dusty, but the 78GHz high-frequency SITRANS LR560 radar transmitters have no problem “seeing” the material and reporting accurate levels to operators.

Carr’s also installed a number of SITRANS AS100 acoustic sensors to alert operators of no-flow blockages in pipes carrying grain from the receiving area into the silos. In addition, the company removed some existing level switches that were prone to breakdowns and replaced them with more robust SITRANS LPS200 level paddle switches, which have been in service for more than four years at the site without any problems. The switches monitor high and low levels in a small stainless steel service hopper containing gluten. 

In another wireless application, Emerson Process Management recently introduced the Rosemount 708 wireless acoustic transmitter and steam trap monitor. “It basically straps onto a pipe with the simplicity of a metal band,” says Deanna Johnson, wireless products marketing manager. “It takes no more than 30 seconds to install and immediately starts communicating the status of the steam trap it’s monitoring.”

The batteries last for a number of years, and because the units are wireless and just bolt on, there’s no need to break into any pipes, run wiring or conduct the kind of maintenance required by traditional steam trap monitoring systems. 

“Steam production is a significant operating expense for processing plants, and about 20 percent of the steam leaving a boiler is typically lost through failing steam traps,” explains Johnson. “The Rosemount 708 wireless acoustic transmitter provides accurate measurement and constant visibility to steam traps, eliminating the need for manual inspection, while enabling dramatic decreases in steam trap failures and fuel cost reductions of 10 to 20 percent each year.”


Getting the best outcome

There are many things processors should take into consideration when choosing an instrument supplier. According to Petrovich,  “The processor should be confident the supplier’s products feature viability, reliability and profitability. The steps of automation can be a gradual process, so the systems should be modular, so processes can be added to over time.”

“When setting up a system, look for a supplier with a wide range of instruments designed for hygienic processes, as well as options for utility and wastewater,” says Ola Wesstrom, senior industry manager for food and beverage at Endress+Hauser. “In addition, look for standardization, which is an important feature that helps with training, spare parts and commissioning support.”

Ted Kopczynski, field marketing manager at Hardy Process Solutions, adds, “Know what you need and, if you’re not sure, work with a supplier to find out. Don’t skimp on up-front costs; factor in your system’s projected lifetime, the cost of maintaining it and availability of future equipment and connectivity. And, find partners that are easy to work with, not just vendors that are here today and gone tomorrow.”

According to Bill Wilson, hygienic market specialist at Anderson Instruments, flexibility is another factor to keep in mind. “Probably one of the biggest challenges is keeping pace with consumer tastes and trends,” he explains. “For example, one of our customers and a large dairy decided to launch a rehydration product based on milk-based powders instead of the regular water, sugar and flavorings. Adding powders meant a significant change in production methods—temperature, pressure, flow rates and other things—for this new product.” Wilson says PI equipment that can be reconfigured to adapt to changes like these and be compatible with a wide number of control systems can save producers a lot of time and money.

Anderson’s MPF pressure transmitter is a good example. Essentially a pressure sensor, it is distinguished not only by having a high turndown capability (being able to go from 500 psig to 50 psig, for instance), but also by maintaining the same percentage of calibrated accuracy at any turndown level the producer desires. 

Anderson’s ITM-3 turbidity sensor is another example of flexibility. It’s often used by producers with a number of changeovers throughout the day that don’t want to waste startup water or product due to time-controlled phase transitions. The infrared optical sensor uses back-scattered light to detect suspended solids as soon as they appear in the pipe, enabling producers to ignore time control and make changeovers with zero waste of water, product and money.

Wolfgang Stueber, industry manager for food and beverage at ABB Automation in Frankfurt, Germany, notes that successful food products are often copied within six months, which is another reason control systems must be very flexible. For instance, many food producers still use batch processes, so control systems should also carry batch features. 

ABB Automation provides instruments designed for food and beverage processors, including sanitary temperature sensors and pressure transmitters, hygienic volumetric and mass flow meters, control room products and sanitary control valves with positioners.


Providing modularity and connectivity

Hardy’s Ted Kopczynski says his company’s new H1 6600 weight processor system is a good example of both modularity and standardization; it delivers up to 30 channels of continuous weight readings to PLCs, PACs and DSCs over a single Fieldbus network connection. Consequently, it’s ideal for applications that require more than one channel of weight, such as inventory tank farms, batching systems and multi-head filling machines. Each channel processes signals from up to four connected load cells that output the entire system weight data over EtherNet/IP, Ethernet TCP/IP, Modbus RTU, Modbus TCP or Profibus-DP.

Connectivity is one of the most important areas Hardy is watching. Kopczynski notes a trend from batch to continuous processing to help meet this need. “The PLC/PAC/DCS is doing more of everything. We see a trend away from individual weight controllers to processors that have no I/O and just send accurate data to the plant control system, either over an OPEN network or directly via a plug-in module of the PLC/PAC.”
 

Reliability and connectivity are key

According to Endress+Hauser’s Ola Wesstrom, plant floor connectivity is getting better all the time. “Digital protocols such as Ethernet I/P and HART make it easier to access multiple variables from one device. For example, digital communication provides easy access to density, temperature and other device/process diagnostics on a Coriolis mass flow meter, whereas in the past, only the mass flow parameter was typically used. This information can be used for process or instrument diagnostics.”

He also says process instrumentation continues to improve the hygienic design of plants while improving efficiency. “A well-designed system reduces product loss during changeovers and makes cleaning faster and easier, which results in less water, detergent and energy being used,” he notes.

Challenges in the food industry include the reliability of equipment in a harsh washdown environment, high vibration and rapid temperature changes, each of which poses a challenge for equipment manufacturers, Wesstrom continues. “Having plant personnel with the skill levels to configure and maintain instrumentation is also a challenge due to retirements and lean operation budgets.

“New regulatory standards, as well as internal and retailer-driven quality standards such as SQF and ISO 22000, are driving a need for people well versed in calibration and documentation. These are not resources often found internally in food manufacturing companies,” observes Wesstrom.

“Nowadays, reliability is a must,” he adds. “Overall equipment efficiency is a primary KPI in most plants, and any downtime due to unreliable measurement is unacceptable.”

For example, when a major brewery wanted to boost production capacity and expand in the US, the company knew it had to make better use of water, air, gas, electricity and steam. The brewery hired Endress+Hauser, which recommended a full energy management resource conservation plan, including measurement solutions ranging from simple temperature and pressure to more advanced flow computers to calculate the usage of boilers and steam in real time.

For water conservation, Endress+Hauser installed a Promag electromagnetic flow meter that monitors water usage, identifies water and beer loss, and monitors and reduces waste released to the municipality. For fuel oil conservation, it specified a Promass Coriolis mass flow meter, which was installed on the incoming fuel oil line to provide highly accurate readings, resulting in reduced fuel oil costs. Endress+Hauser also installed an Energy Manager RMC621 flow and energy computer to provide better electricity and steam conservation.

The upgrades resulted in water usage being reduced by 28 percent (from $1 million/year to $720K/year); CO2 recovery amounting to $2 million/year; a 15 percent reduction in compressed air usage; and a $34K/year reduction in fuel oil consumption. The overall result was a nine-month payback on a $1 million investment.  


For more information:

Denny Petrovich, Siemens Industry, 215-206-4606, dennis.petrovich@siemens.com, www.siemens.com

Cynthia Esher, Measurement, Control & Automation Association, 757-258-3100, mcaa@measure.org, www.measure.org

Deanna Johnson, Emerson Process Management, 512-834-7676, deanna. johnson@emerson.com, www.emerson.com

Ola Wesstrom, Endress+Hauser, 317-370-9263; ola.wesstrom@us.endress.com, www.us.endress.com/food

Ted Kopczynski, Hardy Process Solutions, 858-255-6782, ted.kopczynski@hardysolutions.com, www.hardysolutions.com

Bill Wilson, Anderson Instruments, 518-922-9228, bwilson@andinst.com,www.andinst.com

Wolfgang Stueber, ABB Automation, +49 69 79304196, wolfgang.stueber@de.abb.com, www.abb.de/automationtour

KEYWORDS: controls flow measurement instrumentation

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Jaan Koel was a Contributing Editor for FE.

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The Emerson Process Management Rosemount 708 wireless acoustic transmitter and steam trap monitor decrease steam trap failures and fuel costs by 10 to 20 percent annually. Source: Emerson Process Management.
Endress+Hauser electromagnetic flow meters are commonly used to measure plant mass balance, water usage and process control. They are accurate (0.2 percent or better), have no moving parts, eliminate pressure loss and are CIP-able. Source: Endress+Hauser.
Siemens’s SITRANS LPS200 level paddle switches monitor high and low levels in the gluten hopper at Carr’s Flour Mill in Maldon, UK. Source: Siemens.
A Hardy Process Solutions HI LPRC Series load cell and mount used in the conversion of a skirted silo to a weigh silo increases accuracy. Source: Hardy Process Solutions.
Shown in this brewery application, ABB’s electromagnetic ProcessMaster flow meter features self-cleaning and double-sealed electrodes that enhance reliability and performance. Source: ABB.

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    • Automation
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    • Fabulous Food Plants
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    • Maintenance Strategies
    • OEE
    • Packaging
    • Sustainability
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    • Plant Construction Survey
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