ITM Spanish Presentation 10-13-2011
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Transcript of ITM Spanish Presentation 10-13-2011
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AndersonInstrument Company, Inc.
Medicin de Turbidez
Alex Araujo
Gte. Regional
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Turbidez: ?Que es?
Normas Internaciones de medicin de turbidez
Unidades de medicin
Tcnicas analticas de medicin
Diseo de equipo bajo la norma ISO 7027
Propiedades y caractersticas que influyen la medicin
Calibracin de instrumentos
Especificaciones y funcionamiento de turbidmetros Anderson
Resume de Capacitacin
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Turbid ez -Qu es?
.
La turbidez es una caracterstica ptica o propiedad de un lquido, queen trminos generales describe la claridad u opacidad del lquido.
La turbidez no tiene que ver con el color, sino que se relaciona mscon la prdida de transparencia debida al efecto de partculas en
suspensin, material coloidal, o ambos. Una falta de turbidez resultaen la pureza ya que es, en parte, el efecto de estos diversos materialesen suspensin sobre la luz que atraviesa el lquido.
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Visible light
wavelength
radiatedpower
La longitud de onda de la radiacin visible: 400...700 nm.
Influencia del color
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Agua de Llave Leche Descremada Cola
Comparacin de Turbidez
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Existen diferentes normas vigentes con los lineamientos para ladeterminacin de turbidez en la calidad del agua, tanto internacionales
como nacionales :ISO 7027. (1999). Water quality - Determination of turbidity.
DIN 38404-10. (1995). German standard methods for the examination of water,
waste water and sludge.ASTM D1889-00. Standard test method forturbidity of water.
Method 180.1 USEPA: Determination of turbidity by nephelometry.
NMX-AA-038-SCFI-2001:Anlisis de agua - determinacin de turbiedad enaguas naturales, residuales y residuales tratadas.
NOM-127-SSA1-1994: Salud ambiental, agua para uso y consumohumano. Lmites permisibles de calidad y tratamiento a que debe
someterse el agua para su potabilizacin.
NORMAS
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Units of Measure of Turbidity:
NTU - Nephelometric Turbidity Units (only 90 degree scattered light
method)
EBC European Brewing Convention (equivalent to TE/F)
FTU Formazine Turbidity Units (Scattered light method)
FNU Formazine Nephelometric Units (independent of
measurement angle)
Unidades de medicin
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La unidad nefelomtrica de turbidez, (UNT) expresada habitualmentecon el acrnimo NTU del inglsNefelometric Turbidity Unit, es una
unidad utilizada para medir la turbidez de un fluido.
Corresponde con una concentracin del producto utilizado como patrn
llamado Formacina, que es una solucin que se puede crear utilizando
Sulfato de Hidracina y Hexametilentetraamina en unas proporciones
conocidas para formar el patrn de turbidez .
Suspensin Patrn de Formacina: Se prepara de la siguiente forma: a)
Solucin 1: disolver 1 g de sulfato de hidracina ( MUY PELIGROSO )
en agua destilada y dilyase hasta 100 ml.
El instrumento usado para su medida es el nefelmetro o turbidmetro,
que mide la intensidad de la luz dispersada a 90 grados cuando un rayo
de luz pasa a travs de una muestra de agua.
Patrn Formacina. Qu es?
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Unidades de medicin ISO 7027
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Tcnica Analtica de Medicin
Nefelometra: Tcnica analtica basada en la dispersin de la luz por partculas
en suspensin en el seno de una disolucin, midiendo el haz de luz en la
direccin que forma un ngulo recto (90).
Turbidimetra: Tcnica analtica basada en la dispersin de la luz por
partculas en suspensin en el seno de una disolucin, la cual mide la
disminucin de la transmitancia del haz de luz al atravesar la muestra.
Big particles: > 0,1 m
Small particles: < 0,1 m
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The 90 signal is almost completey independent to the particlesize or color and is mostly affected by particle quantity.
The forward scattered light (11...25) is mostly affected by theparticle size and quantity.
TAMAO Y CANTIDAD DE PARTCULASANGULO DE MEDICIN
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Los instrumentos actual y comnmente utilizados son los turbidmetros,
que emplean un mtodo cuantitativo y deben cumplir los siguientescriterios en el diseo ptico:
La longitud de onda de la radiacin incidente debe ser de 860 nm. La fuente de
luz puede ser lmpara de tungsteno; diodos (leds) lser.
El ancho de banda espectral debe ser menor o igual a 60 nm. La convergencia de
la radiacin incidente no debe exceder 1,5 en turbidmetros de radiacin difusa
y u o 2,5 en turbidmetros de radiacin atenuada.
El ngulo de medicin entre la radiacin incidente y la radiacin difusa debe ser
de 90 2,5 en turbidmetros de radiacin difusa y u o 0 2,5 en turbidmetrosde radiacin atenuada.
La distancia recorrida por la luz incidente y dispersada dentro del tubo de
muestra, no debe exceder 10 cm.
DISENO DE EQUIPO: NORMA ISO 7027
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Cantidad de partculas
Tamao de las partculas
Longitud de onda de luz utilizada
Geometra de las partculas
Indic de refraccin de las partculas
Presencia de burbujas de aire
PROPIEDADES DEL PRODUCTO QUEAFECTAN LA MEDICIN DE TURBIDEZ
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All scattered light measurements are calibrated acc. to the Formazinestandard.
This standard was established in 1926. Instruments must becalibrated to Formazine standards and produce repeatable values.
Precondition: They must be calibrated utilizing the formazinestandard!
Calibration of scattered light measurements
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Anderson Turbidity Products
ITM-3Backscatter (reflection)
>2000 NTU
ITM-490 scattered light
0
5000 NTU
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Anderson ITM-3
Backscatter Turb id i ty Mon i tor
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Anderson Instrument Company
ITM-3 Turbidity Monitor
8/15/2013
Suitable for high turbidities
Media with a turbidity of at least
2000 NTU (ca. 6 %)
Product phase separation (e.g.
skimmed milk
milk)
Yeast harvest (process automation
in breweries)
Phase separation in cleaning
process
Functional principles: Backscatter (reflection) principle
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Sender Empfnger
Lichtwellenleiter
MediumPartikel
Functional principles: Backscatter (reflection) principle
ITM-3
Infra-red LED emits light intomedia through the sapphire
lens
Receiver measures amount
of light reflected back by
particles suspended in the
media
Generates signal that is
proportional to the amount
of particles = relative
turbidity
Transmitter
IR-LED
Receiver
photo diode
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ITM-3 Techn ical Featu res
-Measuring range starts at 2000 NTU
-Display for indication and programming
-4-20mA output assignable to 5 ranges
(10,20,50,100,200)
-DC Switched output adjustable 0- 200-Adjustable dampening 0,1,3,6,13, and 25sec
-One unit with transmitting beam, and
receiver-no need for any other parts
- 2 M12 connectors(1 needed for power withanalog output)
- 3-A
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ITM-3 Piping Ins tal lat ion
Pipe must be filled! Air bubbles adulterate measurement
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Analyt ical Ins trum entat ion
Product-to-water transitions
Water-to-product transitions
Product-to-product transitions
CIP Rinse monitoring
Effluent Monitoring
Filter Monitoring
Yeast harvest control
Applications
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Analyt ical Ins trum entat ion
ITM-3L ITM-3AViscous Products
Ice cream mix
yogurt
Low velocity flow
All other applications
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ITM-3 Specif ic ation s
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Analyt ical Ins trum entat ion
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Anderson ITM-4
4 Beam Turbid i ty Meter
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ITM-4 How Does it Work?
4-beam alternating light
Emitter 1 activeReceiver 1 is measuring transmission light
Receiver 2 is measuring scattering light
Emitter 2 activeReceiver1 is measuring scattering lightReceiver 2 is measuring transmission light
5 x Repetition = 20 Values
Measurement angle for
transmission light according
to ISO 7027: 90
Anderson ITM-4
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wave length 860 nm (colorindependent)
4 ranges selectable via display orvia digital input
switchable between NTU and EBC
Output 420 mA
Switch output 24 V / 50 mA max.
High repeatability < 1 % of f.s.
Optics: sapphire or quartz
ITM-4 Technical Features
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ITM-4 Piping Ins tal lat ion
Pipe must be filled! Bubbles and air adulterate measurement
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Analyt ical Ins trum entat ion
11 preset ranges, any 4 can be assigned for remote selection via 24Vdc
Decoupled input
4-20 mA output (4-wire)
1 24VDC switched output, referenced to ground of power supply
On-board, backlit LCD display, 2 lines x 8 digits
2 M12 connectors, 1 for power and output, 1 for switching and remote
range selection
3A Compliant
Alternating beam method compensates for fouling of lens
860 nm wavelength (color independent)LED light source provides longer life and less expensive replacement cost
Must allow 5X the pipe diameter of straight pipe (upstream) and 2X
(downstream)
Specifications of the ITM-4
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-Product standardization and quality control oflow turb id i tymedia-Control of separator speed based on solids starting to appear in
discharge stream
-Filter monitoring where solids starting to appear in downstream fluid
indicates a failed filter
-Waste water control
-Yeast dosing in a brewery
-Bottled water for QC
-COW (Condensate of whey) water
Chill media monitoring
ITM-4 App l icat ions
2011 Distributor Sales Workshop
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Analyt ical Ins trum entat ion
ITM-4-Cost of ownership
- LEDs longer life and less expensive versus tungten lamps
-Non color dependent
- ITM-4 features LED wave length
-On board display and transmitter
- Lower install cost over remote panel units.
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ITM-4 Specif ic ation s
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Analyt ical Ins trum entat ion
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Questions ?
Analyt ical Ins trum entat ion
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