What Really Are the Zero and Span Calibration Controls?

Fair enough question.

The answer can be expressed in a couple of ways depending on your background and interest.

Moisture, oil/fat and coat weight etc., are all components measured with established Near Infrared (NIR) Technology.   Moisture is measured at 1.94µ or 1.42µ. Organic coatings are measured at 2.34µ and oils/fats at 1.72µ.  These are well established applications in theory, practice and documented literature.

The accuracy of a NIR transmitter is dependent upon calibration samples across a realistic dynamic range.    Normally 3 to 5 samples throughout the dynamic range and including the set point target are the best approach for calibration.  Near Infrared absorbance and constituent content (lab value) enjoy a linear relationship.  The transmitter must be most accurate at the set point.

The zero and span calibration controls are used to make the Near Infrared transmitter display values match the lab values within the limitations of laboratory accuracy and sample handling.  Collecting lab vs. NIR Transmitter values allows for a linear regression to be performed that will yield a correlation    co-efficient, standard error, slope and y-intercept.

Our “Zero” is an offset adjustment, meaning that if the measured value is 2% up or down, that it just needs an offset or zero adjustment around the set point.  The “Span” is a sensitivity adjustment, meaning that for a given change in absorbance, there is a given response in the digital measurement.  The fully automatic calibration sequence adjusts the zero and span for the operator based on these calculations to provide the correct Zero and Span for the analyzer to accurately measure and display the NIR measurement.

Enter Calibration Parameters of Lab vs. MCT Transmitter

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Correlation Co-efficient, Standard Error and New Zero and Span

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Large 5.7” Display with Analog Outputs & Ethernet Communications

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Cross Direction Web Profiles

 

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PSC NIR Solutions!

Process Sensors has many Near Infrared (NIR) Solutions for your Process,

At-Line and Laboratory Needs. Call us!

508.473-9901.

 

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Happy Halloween!

 

Halloween is thought to be an outgrowth of the Celtic holiday for “Summer’s End” celebrating the end of the Harvest Season.  The ancient pagan festival began over 2,000 years ago and many Celts believed that the dead walked among the living during this festival.  The idea of dressing up as the dead in costumes may have been to fool the spirits that the living were one of them and thus pass them by.  Today it’s a huge American Commercial Holiday that accounts for billions of dollars in sales and continues to grow worldwide.

Happy Halloween from Process Sensors…and Annabelle!

 

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Hot Melt Measurements With Guardian Options

hot-melt-adhesivesHot Melt Measurements are typically measured with Near Infrared (NIR) transmitters that provide a digital display in engineering units, analog outputs and a digital interface.  The NIR non-contacting Hot Melt measurement is extremely accurate and stable with no regulatory requirements.  The measurement can be fixed point or scan across the web to provide a cross direction web profile.

The Guardian Web Profile System provides a Cross Direction profile on a large flat panel LCD in an economical and attractive enclosure. The Guardian is fully automated with product recipes for scan speed, zone average, and data logging digital outputs. This is a complete system with automatic web edge detection to provide the highest value performance to cost ratio. The system can supply CD Web Profiles and MD Trends for hot melt thickness, residual moisture and temperature. Multiple measurements can be displayed on a single large display screen.

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The Entry Level Profile System provides a simple and inexpensive automatic scanning frame with a 12” Operator Inteface (OI) for profile display and controls mounted on the frame end.  The Simple Cross Direction Scanning System with Digital Display allows for automatic scanning or jogging to fixed position for machine direction measurement and display on a 5.7” touch screen.

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Some Dogs Are Just Big Puppies At Heart!

Happy Friday from Process Sensors!

 

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Label Expo Chicago Booth 1828 September 7 – 9



Label Expo logo 071414Process Sensors Corp.  announces a new economical introductory level Guardian Cross Direction Web Profile System for the Tag, Tape and Label Markets.  Process Sensors Guardian System offers large central display consoles with remote work stations and displays for multiple scanners and multiple measurements down the line.

The New Guardian OI based system features a single frame with 12” Touch Screen Profile Display and will be introduced at the Label Expo 2014 in Chicago (Booth #1828).  Both Systems feature advanced diagnostics, automatic web edge detection and easy to operate menu recipes.  The Guardian System can measure moisture, water based coat weight, film thickness and organic deposition on a wide variety of substrates including paper, film, foil, metal, non-wovens and more.

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Happy Father’s Day from Process Sensors!

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Happy Mother’s Day from Process Sensors!

Mother's Day Anna Jarvis 2 051114Sunday May 11th is Mother’s Day!  Anna Jarvis helped found Mother’s Day and often emphasized that hand written notes from children to their mothers was much more important than store bought cards and chocolates.  Happy Mother’s Day from Process Sensors!

 

 

 

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Happy Patriots Day & Congratulations to Boston Marathon Winners!

….the Boston Marathon was a booming, positive success story….36,000 runners…a million observers (how that is determined, I have no idea)…picture perfect weather day…PSC is located in Milford MA about 3 miles from the Boston Marathon Start in Hopkinton MA!

Congratulations to American Meb Keflezighi who is the first American man to win the Boston Marathon since Greg Meyer in 1983, and to Rita Jeptoo who set a course record with a time of 2:18.57.

A Great Day for Boston, America and the World Celebrating Sportsmanship and Freedom!

 

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Rita Jeptoo Sets New Course Record in 2014 Boston Marathon

Boston Marathon

Meb Keflezighi is first American man since Greg Meyer in 1983 to win Boston Marathon!

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Boston Marathon 2014

 

 

Bioenergy Fuels & Products and PELICE Shows in Atlanta is Heating Up!

Process Sensors is showing our new MCT460-WP wood products moisture transmitter.  This winter’s cold has driven the need for wood pellets and other bioenergy fuels to new heights!

 

Process Sensors Booth at Bioenergy Show Atlanta 2014