Pack Expo was a great show with Eduardo Villasenor and Luis Rivera of J.A Diaz, our Mexican Distributor, and ThermoCense, our Chicago area representatives joining us. We visited with many existing customers with new projects and new customers. Great Show for us!
Highlight Sunday night was Nick Wallenda’s tight rope walk a few blocks from the convention center. Happy Friday from Process Sensors!
The check standard is a stability check and validation that analyzer performance hasn’t changed. After the unit has been calibrated, you go to a pre-selected “Cal Check” product channel and record the high value and low value. The high and low value for the check standard should always be between +/- 0.1 to 0.2 of original cal check values.
There are three immediate benefits for the standards. First is that they are stable and don’t change. Samples of known moisture, oil, coat weight or other parameter are required for calibration. Typically 3-5 samples throughout the range of interest. Calibration is easy. To check calibration after start up, you can’t use retained samples because they aren’t stable and degrade. The Cal Check standards are stable to check analyzer stability.
Secondly, most customers want to routinely validate all of their analyzers performance. The Cal Check standards allow for periodic validation. Most customers who have used our analyzers for a long time check every 3 months. Newer users usually check once a week, then once a month etc. It’s a confidence booster.
Thirdly, if you get an usually high or low measurement you can quickly check whether the analyzer has changed or sample or process. And make necessary adjustments. Calibration Check Standards are a valuable tool in diagnostics.
Near Infrared (NIR) measurements are based on specific absorption bands in the electromagnetic spectrum between 800 and 2500 nanometers (nm). While full spectrum analyzers may utilize the entire spectrum and multivariate mathematical treatments such as Principal Component Regression (PCR), Partial Least Squares (PLS) or neural networks, photometers use “slices” of the spectrum that correspond to specific molecular overtones and associated vibrational absorptions.
Photometers utilize narrow band pass interference filters that have a specified band width typically 50 nm wide, though the band width is sometimes application dependent. The NIR has broad bands as opposed to the sharp peaks in the Infrared region. Common bonds are O-H (1940 and 1420 nm) in water, C-H (2340 nm) in organics and oils and N-H in proteins. The absorbance level at these specific wavelengths is proportional to the quantity of the constituent to be measured.
Shining light at these wavelengths causes the corresponding chemical bond to vibrate and absorb energy. Think of different sections of a stadium crowd called upon to shout and jump when their section is highlighted on the stadium Jumbotron.
Photometers compare near infrared energies at measure and reference wavelengths and are typically calibrated with a simple linear regression analysis though non-linear algorithms can be employed for specialized applications or for wide dynamic ranges. Photometers are easy to install and maintain and they are used in process, at-line and in the laboratory for rapid product analysis. Typical applications are found in the food, pharmaceutical, tobacco, converting, chemical, mineral and wood processing industries.
Process Sensors Has Always Valued Quality Customer Service and For Halloween We Were Progressive!
Process Sensors Corp. (PSC) will be an active participant and sponsor at the AIMCAL Web Coating & Handling Conference 2013 Charleston, SC. PSC will participate in Sunday and Monday Table Top Events and PowerPoint summaries. PSC will also present a paper on Monday, October 28th in Aimcal’s Processing Technology section at 10:30. The paper discusses “Controlling Re-Moisturizers to Reduce Edge Curl and Improve Web Flatness with Cross Direction Web Moisture Profile”.
AIMCAL Conference is October 27 – 30th in Charleston, SC. Industry experts gather to discuss problems and solutions. We hope to see you there!
IFT (International Food Technology Show) in Chicago allowed us to meet our many friends and customers. High attendance and interest led to a successful show!