RZ Getr−nke E 4/05 - SIGRIST Process

OPTICAL INSTRUMENTATION
FOR THE
BEVERAGES INDUSTRY
SIGRIST
PHOTOMETERS
FOR PROCESS MONITORING
Committed to
upholding tradition
Turbidity measurement in the beverages industry, notably filtration
monitoring in the brewing process, has been firmly linked with the
SIGRIST name for over 50 years. SIGRIST turbidimeters are used worldwide for quality control and filtration monitoring, thus helping to ensure
the quality of beverages such as beer, whisky, mineral water, wine and
fruit juices. This brochure provides an overview of the various SIGRIST
instruments and their applications in the beverages industry.
The company
SIGRIST is a leading manufacturer of process photometers for continuous safety, purity and quality monitoring. Whether you're talking
turbidity, suspended solids, dissolved substances, color, oil or dust,
we produce an instrument adapted to your particular process. With our
reliable, low-maintenance sensors, we can help you guarantee quality
and reduce operating costs.
The SIGRIST Group is domiciled at Ennetbürgen, Switzerland. About
60 employees work at the head office developing, producing, and
selling SIGRIST photometers. Around the world, a network of over
50 representatives and service partners provides on-the-spot assistance.
Wherever you are, a SIGRIST expert is never far away.
Leadership through
innovation
Steady progress In sensor technology and the implementation of innovative ideas to the benefit of users mark all of SIGRIST's products.
Today, modern sensors with semiconductor light sources and microprocessor controls keep this instrumentation technology reliable and
practically maintenance-free. At the same time, it is usable for an everbroader range of duties in the monitoring and control of production
processes as a result of reduced capital cost with simultaneous expansion of measurement capabilities.
SIGRIST PHOTOMETERS
IN THE BEVERAGES INDUSTRY
Optical measurement technology
Originally, process photometers were used in the beverages industry
mainly for monitoring and ensuring the quality of the finished products
and raw materials by means of optical measurement techniques. Today,
tight control of production processes with the aid of modern sensors
is growing in importance. Highly focused process optimization and
process control within narrow limits help improve product quality right
from the start and cut production costs at the same time.
SIGRIST produces sensors for measuring two optical variables in the
beverages industry: turbidity and color.
Turbidity measurement
Turbidy measurement's job is the detection of undissolved solids in the
beverage. Turbidity is an important variable in terms of ensuring the
quality of the final product, but it is also crucial to the control of various
process steps. The turbidity level is determined by measuring the intensity of the light scattered by the solid particles. The intensity of the
scattered light is proportional to the solids, i.e. particle concentration.
SIGRIST turbidimeters are calibrated at the factory with formazine in
EBC, ASBC, NTU or FNU units.
Color measurement
The measurement of color is also very important in ensuring beverage
quality. Color is measured by absorption, i.e. light attenuation at certain
wavelengths. SIGRIST absorptiometers are calibrated at the factory in
EBC, Hazen, or other color scales to meet the user's requirements.
Measuring principle turbidity
Measuring principle color
SIGRIST PHOTOMETERS
IN THE BREWERY
Even though beer brewing goes back about six millennia, today's
breweries would be inconceivable without modern instrumentation.
Stiff competition in the beer market is forcing brewers to keep a sharp
eye on the economics of their process and on the unwavering quality
of their final product.
SIGRIST turbidimeters and absorptiometers for in-line process control
help to automate individual process steps, besides giving the brewmaster important information on the status of those steps. At the
same time, SIGRIST laboratory turbidimeters ensure MEBAK-compliant
quality control in the laboratory.
Brewing process
Mash tun
1 Hot wort turbidity after
lauter tun
2 Hot wort turbiditiy after
whirlpool
3 Yeast feeding
4 Separation yeast/ beer
5 Turbidity of unfiltered beer
6 Turbidity after Kieselguhr
filter/ filter control
7 PVPP feeding
8 Turbidity after PVPP-filter/
filter control
9 Turbidity after sterile filter/
filter control
10 Color after filter
11 Turbidity before filling
12 Phase separation filling
13 Turbidity in laboratory/
forcing test
Brewhouse
Mach pan
S
S
1
Lauter tun
Wort pan
Storage tanks
2
Whirlpool
Fermentation
tanks
Yeast tank
Fermantation/
Storage
Wort cooler
S
S
Storage
Fermentation
4
3
S
S
6
Filtration
S
5
S
Kieselguhr
Kieselguhr
filter
Filling
Botteling
Quality
assurance
8
PVPP
S
S
S
12
11
10
Buffer tank
Laboratory
S
13
7
PVPP filter
S
9
Sheet filter
Wort turbidity
Measurement of turbidity in the hot wort can be used to optimize the
lauter tun work and for controlling the whirlpool and the separator.
The clarification process is crucial for the efficiency of the rest of the
brewing process, most of all during wort boiling, but also during
fermentation and filtration. A wort that is uniformly clear will give a
optimum quality of the beer. MEBAK-compliant turbidity measurement
in the wort with forward scattered light makes it possible to optimize
the clarification process in terms of these aspects.
Pre-filter turbidity
Even today, the feeding of filter aid is based largely on empirical data.
In some breweries, the feed rates are controlled on the basis of the
filtrate's turbidity level. The turbidity of the unfiltered beer provides
additional information for filter aid dosing.
Filtration control / monitoring
In-line turbidity measurement was first used in the brewing process for
monitoring the filtration step. The measurement of colloidal turbidity by
means of the 90° scattered light as a measure of the beer's clarity is an
important visual quality criterion, and it can also be used for controlling
the feed rate of filter aid. Supplementary measurement of the forward
scattered light makes it possible to detect Kieselguhr particles and yeast
cells selectively. This permits optimal control of the recirculation loop
during forming of the filter cake and filter breakthroughs.
Unfiltered beer turbidity
In the case of unfiltered beers containing yeast and proteins like
German white beers, the turbidity level is an important criterion for
constant product quality. With in-line turbidity measurement, centrifuging, filtration, or yeast feeding can be controlled to obtain precisely
the desired level of turbidity.
SIGRIST PHOTOMETERS
I N T H E B R E W E RY
DualScat in-line turbidimeter
DualScat is a multipurpose instrument with a measuring span from
0 to 500 EBC for measuring the turbidity of filtered beer, unfiltered beer,
and worts. DualScat is the first in-line turbidimeter capable of measuring 90° and forward scattered light simultaneously with a single detector head, which permits very compact installation in cramped conditions.
The sensor is inserted into the product pipe with a standard in-line
housing. The instrument uses SIGRIST's tried-and-tested dual-beam
measuring technique for the reliable compensation of beer coloration
and cell window fouling. The result is a highly reliable measurement
signal with long-term stability.
Dual-angle measurement
The simultaneous measurement of 90° and forward scattered light
yields two different types of information. The reason for this is that
the spatial distribution of the light scattered by particles of unlike sizes
is different. The graph below shows the typical distributions produced
by selected materials. The 90° signal indicates primarily the content of
smaller particles such as protein molecules, while the forward scattered
light is caused mainly by large particles such as yeast cells or Kieselguhr.
In the filtration step, this makes it possible to obtain an indication of clarity and therefore beer quality (90°) together with filter monitoring (25°).
In-line product monitor RAMS
The RAMS Product Monitor can be used for detecting phase transitions,
for measuring medium and high turbidity levels, and for product identification. The RAMS simultaneously measures the reflection and absorption of liquids in the product pipe at four different wavelengths.
The RAMS features are easy installation with standard in-line housings,
zero-point correction with tap water, hygienic design, and the possibility of parametrizing the instrument with a PC and suitable software.
Color monitor ColorPlus VIS
The color of beer is measured by absorption at a wavelength of 430 nm.
The result is stated in EBC or other units. Optionally, turbidities can be
compensated by simultaneous measurement at 700 nm. This makes it
possible, for example, to measure the color of wort or of wheat beer.
Like all SIGRIST process measuring instruments, ColorPlus provides
high reading stability thanks to the dual-beam measuring method and
requires hardly any servicing.
Laboratory turbidimeter LabScat
The LabScat is the equivalent to the DualScat for the laboratory.
Reliability and easy operation are the strong points of this instrument
used for lab measurement of turbidity and accelerated aging tests.
Both light and dark beers can be checked right in the bottle or in cuvettes with a measuring span of 0-500 EBC. Any effects of bottle damage
or unevenness are completely eliminated by automatic bottle rotation
and water bath. The data are stored in a memory with a capacity of 999
readings and data output to a printer or as a file on a PC is always possible.
Like DualScat, the LabScat detects the 90° scattered light and the 25°
forward scattered light. Here again, this provides additional information
about turbidity substances contained in the beer.
SIGRIST PHOTOMETERS
IN WINERIES AND
DISTILLERIES
Of course turbidity measurement is not restricted to breweries.
SIGRIST process and laboratory turbidimeters have been used in
wineries, champagne cellars and distilleries for many years.
The primary application is the control and monitoring of the filtration
process, together with control of product quality in the laboratory.
Especially in the cases of whisky and cognac, cold filtration following
the sedimentation of fatty acids is an important process step in terms
of product quality.
Filtration checking for high-percentage alcohols calls for explosionproof measuring instruments. Because the turbidity levels measured
are extremely low, the instruments used must be highly sensitive and
very stable.
Cognac filtration
1 Turbidity after final filter/
filter control
2 Turbidity in laboratory
In-line turbidimeters DualScat and DualScat Ex
DualScat is a multipurpose turbidimeter with a measuring span of
0- 2000 NTU, or 0-500EBC. The most sensitive measuring range up to
2 NTU is very suitable for the very lowest turbidity levels.
Especially when it comes to the smaller filtration units frequently used
in wineries, the single-angle version of DualScat with 90° measuring
angle offers a low-cost alternative for ensuring product quality. It can
be installed practically anywhere thanks to the one-sided, compact
construction and installation using an in-line housing.
In the case of larger process installations, the dual-angle instrument
offers the benefits already discussed in connection with the brewing
process, namely the ability to detect and control product quality and
the filtration process with two separate readings.
In addition to the DualScat capabilities, DualScat Ex offers explosion
protection in compliance with the EEx dIIC T6-T3 designation.
Laboratory turbidimeter LabScat
The LabScat is a reliable, easy-to-operate turbidimeter for the laboratory. Clear filtrate as well as high turbidity samples as must with a turbidity up to 2000 NTU are possible. The measurement is independent of
the sample color and can be done in bottles or cuvettes. The data are
stored in a memory with a capacity of 999 readings and data output to
a printer or as a file on a PC is always possible.
An optional semi-automatic version of LabScat is available for
controlled turbidity measurement at specific temperatures for quality
assurance in the laboratory.
SIGRIST PHOTOMETERS
IN THE MINERAL WATER INDUSTRY
In addition to the minerals contained, visual clarity is an important
criterion for the purity, bacteriological safety and consumer acceptance
of mineral waters.
Just as in the case of drinking water, the quality of mineral water has to
be assured by monitoring the raw water drawn from springs and wells,
as well as any filtration steps, with in-line turbidimeters.
Raw water heavily loden with iron or manganese is cleansed of these
impurities by aeration. The injection of oxygen produces iron and
manganese compounds that precipitate in flake form and can then be
filtered out. Turbidity measurement is also used to monitor this process
step.
1 Turbidity of raw water
2 Turbidity after filtration
Source
Sand filter
Well
Bottling
Aeration
Turbidimeter DualScat
DualScat is a multipurpose turbidimeter with a measuring span of
0-500 EBC, or 0-2000 NTU. It is used in potable water treatment and in
industrial processes for product and filtration monitoring.
The outstanding features of DualScat include the high stability
afforded by the dual-beam measuring method and simple correction by
means of a solid reference standard. Installation is possible practically
anywhere, even in the case of small setups, thanks to the instrument’s
one-sided, compact construction. DualScat is available as a single-angle
instrument with either 90° or 25° measurement or as a dual-angle
instrument that combines both measurement angles.
SIGRIST PHOTOMETERS
IN THE
WATER TREATMENT
Water is an important raw material for the brewing and distilling processes. Its quality is important in determining the quality of the product
that goes out the door.
Whether a producer has excellent spring water that can be used directly
or must carry out certain treatment steps such as filtration or deferrization, SIGRIST process turbidimeters can help guarantee the quality of
the water entering the process.
Two important applications are turbidity detection, either for monitoring
raw water quality or controlling or checking filtration and/or iron flocculation, and UV absorption measurement for keeping a check on organic impurities.
A great many water companies depend on SIGRIST instruments in their
waterworks. When it comes to the quality of the raw water, they prefer
to stay on the safe side. For detailed information, refer to our brochure
"OPTICAL INSTRUMENTATION FOR WATER TREATMENT".
Turbidimeters AquaScat WTM and AquaScat P
(available starting in 2005)
AquaScat was developed specifically as a multipurpose turbidimeter for
checking turbidities in potable water treatment. The measuring span of
0-100 FNU covers all applications from springwater to filter monitoring.
Contactless measurement in a free-falling water stream (version WTM)
and regular automatic correction (available optionally) ensure highest
accuracy even at the lowest turbidity levels while reducing servicing
requirements to a minimum.
SAK/DOC instrument ColorPlus UV
UV absorption at 254 nm is a measure of dissolved organic compounds
in water. ColorPlus UV detects a potential contamination of the water
reliably without any delay. Its dual-beam measuring method and the
compensation of window fouling open the way to exceptional measuring stability over the long term and reduce the need for servicing to a
minimum.
INSTRUMENTS
Instrument
Application
Measuring span
DualScat
Turbidity in beverages
Turbidity in processes
Extremely low turbidity in Whisky filtration
/water treatment
0 ... 500 EBC
0 ... 2.000 NTU
0 ... 2 NTU
AquaScat Version WTM/P
(available starting in 2005)
Turbidity in water treatment
0 ... 100 FNU
LabScat
Laboratory turbidimeter
0 ... 500 EBC
0 ... 2.000 NTU
ColorPlus VIS
Color in beverages
Color in water treatment
0 ... 750 EBC
0 ... 20.000 Hazen
0 ... 6.000 E/m
ColorPlus UV
UV absorptiometer for
DOC determination
0 ... 6.000 E/m
www.nobbe.de Photos: Lars Christ
AT A GLANCE
SIGRIST-PHOTOMETER AG • Hofurlistrasse 1 • CH-6373 Ennetbürgen
Phone +41 (0) 41/ 624 54 54 • Fax +41 (0) 41/ 624 54 55
http://www.photometer.com • e-mail [email protected]
Subject to change without notice 10 106 E/2 (02/05)
Represented by: