Worldwide Inline Process Control Solutions

Monitor Filter performance in a brewery

Beer Filtration Control 11° / 90°

Beer Filtering Control 11°/ 90°

Beer Filtering Control 11°/ 90°

The optek Haze Control / DTF16 relies on a dual angle, scattered-light measurement for precise quality control during final beer filtration independent of color and color changes. Using this sensor downstream of the filter monitors filter performance, preventing “out of spec” product while ensuring beer quality and clarity at each filtration step. The 11° channel is sensitive to particle size change and immediately detects break through and other non-normal turbidity events, while the 90° channel quantifies the visual clarity for quality assurance.

optek DTF16 Process Turbidimeter

Filter Feed Line Monitoring

Using an optek AS16-N or AF16-N, the turbidity in the feed line can be monitored, allowing precise feed control while preventing filter clogging or blinding. Optimized body feed rates has tremendous impact on filter throughput capacity. This additional sensor can be connected to your Haze Control / DTF16 system without the need for an additional converter.

Filter Backwash Optimization

The optek AS16-N or AF16-N used for feed monitoring can also be used to optimize your filter backwash process by measuring the turbidity in the water, saving time, energy and conserving water usage.

optek Haze Control

Filter Aid Dosage

Dosage of filter aids like Kieselguhr or PVPP can be controlled with optek absorption or turbidity sensors. Optimizing filter aid usage can dramatically increase throughput capacity and recovered product, and reduce down cycles and costs, all while ensuring consistent product quality.

Beer Interface Detection

The Haze Control / DTF16 system may also be paired with an AS16-F or AF16-F to measure the color of your beer. This measurement controls the phase separation between beer and water ensuring faster product changeovers while maintaining product quality and minimizing product losses.

Filter Setup Monitor

Using the 0° absorption channel of the sensor DTF16, turbidity up to 500 EBC can be measured, allowing you to monitor and control the filter pre-coat cycle. This provides an additional opportunity for filter optimization.

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Haze Control - Physics

Benefits of 11 degree measurements

Why use an 11° measurement?

Forward scattered light is particle size sensitive and its strength is in detecting particles such as yeast, trub and Kieselguhr, efficiently detecting filter breaks and filtrate turbidity caused by particles, even at extremely low concentrations. 11° measurements are very sensitive in this regard and correlate well to actual non-dissolved solids content, essential for proper filtration control and optimization.

Why is 11° better than the traditional 25° measurement?

Scattered light at 11° is more discrete due to higher signal levels and will detect abnormal particulate faster with less influence from colloidal material common at 25°. This is essential for prompt troubleshooting of non-normal turbidity issues.

Beer Filtering Control 11°/ 90°

Why use a 90° measurement?

Turbidity measurements at an angle of 90° are highly sensitive to colloids and are used as a quality check for the clarity of the beer, based on formazin reference standards. Mistakenly, 90° techniques have been used for process evaluations but do not correlate to actual non-dissolved solids content. Modern breweries can now measure this parameter inline and as a result provide the ability to release beer automatically.

Why use a 0° absorption measurement?

Using the 0° absorption channel allows measurements at higher turbidity levels, well beyond the range of the 11° or 90° results, allowing to monitor and control the filter pre-coat cycle as well. This provides an additional opportunity for filter optimization.

Why is the reading of lab and process sometimes different?

The beer in the pipe is homogeneous, under pressure, and at a constant temperature. In the lab, the samples have time to change, solids may precipitate and temperature changes will affect the solubility of colloids and with that, the measurement. In addition, differences in the optical configurations of the instruments themselves, along with the calibration methods used, have an influence on comparative results.

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Haze Control - Technology

optek DTF16 Process Turbidimeter

Filtration Control is Power.

Filtration is one of the most important steps in the brewing process. The optek Haze Control DTF16 allows you to measure and control this crucial process and provides real-time quality assessment. In addition to releasing beer by instrument, there are tremendous opportunities to reduce beer loss, media usage and production costs while increasing filtration capacity and ensuring consistent product quality.

Factory Zero Point

The power behind the optek Haze Control DTF16 is the factory zero point. No longer is a questionable zero media (process water) or offline zero procedure required. Using known technical reference solutions and purest zero media, optek developed a factory calibration and a precise zero point. This drift-free factory zero point eliminates the need for regular zeroing of the instrument saving you time and money and does not depend on the operator. It also ensures that every instrument is base lined identically and precisely. This is invaluable when relying on multiple instrument locations.

Factory Calibration

Each and every optek Haze Control DTF16 is factory calibrated to EBC standards which correlate to all other standards currently in use in process plants today. This calibration is stable for the life of the instrument and does not need recalibration, providing a low cost of ownership.

This ensures precise, repeatable and reliable measurements across multiple instruments and locations. User selectable units of measure and built in correlation tables provide unrivalled flexibility to the brewery.

Drift-free by Design

optek DTF16 Process Turbidimeter

Baseline drift of scattered-light sensors has long been a problematic issue. This is usually caused by unwanted scattered-light, stray light from reflections in the sensor assembly, from the light source itself, worn artificial coatings or external light (i.e. sight glasses). This stray light influences the measurement in an unpredictable fashion.

The optek DTF16 incorporates advanced geometry to eliminate this problem by re-directing the stray light away from the detectors. This design does not rely on any coatings and maintains a cleanable, sanitary design. Combine this ingenious design with the legendary optek signal amplification stability, dual beam ratio detectors and advanced Haze Control firmware and you get a drift and calibration-free process turbidity analyzer with exceptional long-life performance.

Information on Demand

Designed for ease of use, the Haze Control software has seven languages to choose from. In addition to the four transmitted results, the Haze Control has a built in data logger providing you with continuous trending. This data can be displayed locally and downloaded to a computer allowing production personnel to review process consistencies or track down any historical anomalies or process issues.

Communication you need

The Haze Control offers multiple communication options. Up to four mA-outputs can be used simultaneously to transmit data or completely control the converter remotely using a standard I/O interface. Also the bus communication PROFIBUS® PA or FOUNDATION™ Fieldbus is available to integrate the system optimally in your (future) bus system.

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Brewing Filter Control – From Line to Lab

Measure Wort color and final beer color inline

Line and Lab: One optical design

Two optek products are specifically designed for the beverage industry. The optek DT9011 is an “In the Bottle” bench top turbidimeter. The DTF16 is a process scale turbidimeter intended as a true real-time QA/QC turbidity analyzer that can eliminate lab assessments altogether. Both products measure at both a forward scatter angle of 11° as well as the side scatter method of 90°.

optek Haze Control DT9011 Laboratory Turbidimeter

Both results are displayed and recorded simultaneously. The measurement results of the DT9011 laboratory system match the DTF16 inline turbidimeters, allowing validation of process readings to the lab. The 90° angle provides the colloidal haze measurement for visual clarity assessment, while the 11° angle provides concise quantification of turbigen content. The 90° results can be read in any preferred haze scale units such as EBC, FTU, Helms, ASBC or NTU. The 11° angle can be read directly in ppm, mg/L, mc/mL, or an appropriate calibration scale, e.g. EBC, FTU. Measuring at both angles provides lab personnel with considerably more data, and the ability to discern the nature of any turbidity causing material when analyzing finished beer turbidity.

The 11° forward angle is very sensitive to particle size so it is an indicator of abnormal particulate such as Kieselguhr and yeast. In addition, it correlates very well to actual non-dissolved content allowing us to use ppm (mg/L) as a units scale, while the 90° side-scatter angle provides sensitivity to colloids and haze, providing the visual clarity assessment. Using the 11° forward scatter angle is more specific than 25°and eliminates false high readings due to haze because it is nearly independent of colloidal haze. Any filtration issues, whether recipe, process or equipment related can now be diagnosed much easier by knowing the nature of the turbigens being detected.

Using the optek DT9011 turbidimeter, the sample is placed in a water bath and measured 250 times, at both scatter angles, during one rotation, followed by advanced data analysis. This eliminates the effects of bottle color and shape, as well as scratches, seams and other imperfections in the sample bottle. Our broadband wavelength approach complies with MEBAK, while eliminating under reporting of certain particulate common with monochromatic devices.

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