McNab Food & Beverage Systems Overview

[ Features | Brewery Applications | Press Releases | Applications | Measurements | Configurations | Prerequisites | Reference Materials ]


  • Continuous watching of your food/beverage to maintain consistency and uniformity.
  • Continuous measurement - meter reads change of phase - speeds up process. 
  • Superior design for full sanitary requirements, wash-down and CIP environment 
  • Our unique flow cell does not constrict main pipe line or alter food/beverage 
  • Provides cost savings and controls process variables; especially for batch operations 
  • Engineering assistance for site, placement and installation 
  • Excellent documentation for plant upgrade 
  • No more sole-dependence on visual observations
It is critical that you evaluate process changes and variations in key materials as they occur. Haze, color and particle concentration are major considerations when it comes to your customers acceptance of your product.  It is important to minimize product rejections and still meet your customers' expectations. McNab instruments are important to your company's operation.  They solve concentration and color problems from inspection of in-process material to final quality assurance, providing you with substantial cost savings and documentation for QA programs such as ISO 9000 and others. McNab turbidity instrumentation provides across-the-pipe measurement without sampling, in real-time and under actual process conditions to determine absorption, clarity, color, concentration, contamination, haze and turbidity.  McNab analyzers also function as particle counters.  We also have models that measure in the near-infrared (NIR) and ultraviolet (UV) spectrums.

Brewery Applications

The McNab product line was one of the first practical industrial across-the-pipe turbidity meters. The first units were shipped in the early 1960's. These were absorption type meters with wavelengths from visible to near infrared measuring turbidity, particles, concentration, and color. These were relative instruments.

The original product was known as the Jacoby-Tarbox turbidity meter. McNab purchased the product line in 1986. Its hallmarks were rugged construction, sanitary design, calibration by optical filters, and the ability to follow the "Lambert Beer Law" of optics.

In the 1970's the absorption system was enhanced with the introduction of a 90� side scatter system. This had the benefits of automatic self zeroing, color hue compensation, and high sensitivity.

Since that time McNab has developed and introduced digital analyzers to monitor forward scatter (Model RS), back scatter (Model HSD), ultraviolet absorption (Model UVII), fluorescence (Model HSF), dual angle (Model DSB), extended dual angle (Model DSC), near infrared (Model KSA), tristimulus color (Model KSA), color dual and triple beam (Model HSA & Model KSA), as well as a dual-angle laboratory analyzer (Model DLB).

McNab introduced laboratory calibration in true engineering units of measure, allowing real measure of accuracy, not just the "relative concentration units" (CU) or unlabelled scales that were the old standard for the industry. This allows for true automation of the customer's quality control.

McNab has introduced a ten-fold improvement to sensitivity, signal to noise, glass fogging, range, and accuracy. This extended the usefulness over the original equipment.

Maintenance time, both preventive and corrective, have been drastically cut, decreasing the interval to 1/10th of that required on the earlier units. Also included was the concept of "pro-active" maintenance where the instrument itself would call for preventive maintenance in large part avoiding an unjustified costly fixed maintenance schedule.

McNab's design philosophy was to extend the interval of maintenance and calibration so as to have an on-line availability of better than 99.99%.

We are pleased to be the technical leaders in this field of in-pipe optical instruments. This point of view is well documented with actual field data log experiences.

Press Releases:


  • protein concentration
  • concentration of tea after centrifuge
  • crude sugar syrup turbidity
  • tomato pulp separation
  • whey concentration
  • soybean oil chlorophyll
  • online Bostwick
  • fruit juice clarity for product uniformity
  • fermentor cell count
  • product filter outlet
  • filter inlet to adjust addition of filter and detection of bacterial growth
  • change from water to product and reverse
  • corn oil particles
  • chlorophyll
  • and many more�

McNab equipment measures


  • Two Head Configuration: McNab Model AP-VIE and AP-VIS (transmitters) HSA and KSA for color measurement and particulate count.  A special parallel flow assembly is available for parts per billion concentrations and low levels of color.
  • Four Head Configuration: McNab Models HSB and DSB for small particulate and dilute concentrations. Also measures fluorescence and can be color compensated.
  • Single Head Configuration: McNab Model HSD tank mounted unit for particulate count.
  • Laboratory Equipment: McNab Model DLB for particle counting designed to correlate to the field measurement.
  • Brewing Process Systems: McNab Model SKID
  • Signals for control loops and alarm points are available.

Prerequisites for installation

  • Vertical upflow piping configuration
  • Closed top tanks (near absence of light)
  • Bubble-free liquid (bubbles count as particulate)

Additional Reference Materials

We have posted our Optical Measurement of In-Process Fluids (Turbidity Handbook) for reference purposes.

We also encourage you to look at technical papers that have been posted on our website.

In addition we have a list of news releases that may contain pertinent information to your application.


383-2 East 29th Street | Buena Vista, VA | USA 24416-1293

540.261.1045 voice | 540.261.1268 fax |

Copyright � 1999 - 2010  McNab, Inc. All Rights Reserved.  Last modified: 08.12.2010

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