pH- und ORP-Analysatoren

what-is-ph-orpPräzise pH- und Redoxmessungen vom Analysegerät zu erhalten und diese Daten korrekt zu interpretieren ist von entscheidender Bedeutung, um die Produktqualität zu gewährleisten und die Sensor-Lebensdauer korrekt zu prognostizieren.

Die pH- und ORP-Messlösungen von Yokogawa umfassen 2-Leiter- und 4-Leiter-Analysatoren mit einer Online-Sensordiagnose in Echtzeit für zuverlässige Ergebnisse. Unsere pH- und ORP-Analysegeräte nutzen neueste Sensortechnologie für die vorausschauende Instandhaltung. Geringerer Zeit- und Materialaufwand für die Wartung und den Austausch der Sensoren optimiert so die Betriebskosten.

 

 

  FLXA202/21 PH450
 

Bereichsklassifizierung Allgemeine Anwendung
Klasse I, Div I
Klasse I, Div II
Allgemeine Anwendung
Klasse I, Div II
Spannungsversorgung 24VDC schleifengespeist
(2-Leiter)
110VAC, 24VDC
(4-Leiter)
Kommunikation 4-20mA, HART, FF und PA* 4–20 mA, HART
Kontakte und Relais Keine 4 SPDT-Relais

*FF (FOUNDATION-Fieldbus) und PA (Profibus)-Kommunikation nur verfügbar im FLXA21

Die Analysatoren der FLEXA™-Serie sind modular gestaltete Analysegeräte für kontinuierliche Online-Messungen in industriellen Anlagen. Sie ermöglichen Messungen mit einem oder mehreren Sensoren.

 

Die Analysatoren der FLEXA-Serie werden für kontinuierliche Online-Messungen in industriellen Anlagen verwendet. Mit der Option für die Ein- oder Zwei-Sensor-Messung sind sie die flexibelsten 2-Leiter-Analysegeräte auf dem Markt.

Der pH- und ORP-Analysator PH450 ist ein multivariabler Analysator, der pH- mit Temperatur- und ORP (Redox)-Messung kombiniert. Diese Messungen können über verschiedene Ausgangsfunktionen genutzt werden: zwei Stromausgänge, vier unabhängige SPDT-Kontaktausgänge und HART. 

Für industrielle Anwendungen und insbesondere für automatische Prozessmessungen ist es von größter Bedeutung, dass der empfindliche Teil der Glaselektrode und die Membran der Referenzelektrode sauber gehalten werden.

Bei größeren Entfernungen zwischen der Messstelle und dem Analysator, insbesondere wenn die Entfernung die Länge der Standard-Elektrodenkabel überschreitet, bietet dieses Anschlusszubehör eine zweckmäßige Möglichkeit zum Anschluss der Sensorkabel an das Messinstrument.

Das Messgerät PH71/PH72 für pH und/oder ORP (Redox) ist kompakt, benutzerfreundlich, wasserdicht und ideal für den Feldeinsatz. Mit „One-Touch-Kalibrierung“ und Temperaturkompensation. Intelligente pH-Messgeräte in Laborqualität – preiswert, im tragbaren Taschenformat

Optimierung und Eliminierung unerwarteter Vor-Ort-Wartung, Kalibrierung und Systemkonfiguration durch Einsatz der integrierten Echtzeitdiagnose und Funktionen für die vorausschauende Wartung der pH- und ORP-Analysegeräte von Yokogawa.

Rein- und Reinstwasser

Reinwasser weist eine sehr geringe Leitfähigkeit und somit einen hohen Widerstand auf, da alle leitenden Inhaltsstoffe entfernt wurden. In Kombination mit Verschmutzungsanfälligkeit und Temperaturempfindlichkeit machen Lösungen mit geringer Leitfähigkeit genaue pH-Messungen sehr schwierig. Reinwasser und Reinstwasser wird in verschiedenen industriellen Prozessen verwendet, etwa in den Bereichen Halbleiter, Strom, Wasserwirtschaft und Pharmaindustrie.

Mit einem traditionellen pH-Analysator genaue und verlässliche Messwerte zu erzielen ist eine Herausforderung, aber mit der richtigen Ausrüstung lassen sich stabile und präzise Reinwasser-pH-Messungen erreichen. 

Wasser und Abwasser

Die Wasserqualität ist in allen Bereichen der industriellen Prozessautomatisierung von entscheidender Bedeutung. Anwendungen wie Aquakulturen und die Aufbereitung von chromhaltigem Abwasser sind auf präzise pH- und ORP-Messungen angewiesen, um sichere pH-Werte oder eine ordentliche Kontrolle der Chromat-Reduzierung zu gewährleisten.

4-Leiter- und 2-Leiter-pH-Analysatoren von Yokogawa mit geeigneter Eintaucharmatur und entsprechenden Sensoren sind ideal zum Messen dieser wichtigen pH- und ORP-Werte.

Zellstoff und Papier

Die anspruchsvollen Anwendungen und schwierigen Prozessbedingungen in Zellstofffabriken stellen große Anforderungen an präzise, reproduzierbare und zuverlässige Flüssigkeitsanalysatoren. Für die Aufbereitung von Abwasser aus Zellstoff- und Papierfabriken müssen korrekte pH-Werte aufrechterhalten werden, die sich durch einen pH-Analysator kontrollieren lassen.

pH- und ORP-Analysatoren von Yokogawa verfügen über Echtzeit-Sensordiagnose und Funktionen für die vorausschauende Wartung zur kontinuierlichen und stabilen Messung von pH-Werten, machen häufige manuelle Reinigungen überflüssig und ermöglichen einen effizienten Einsatz von Flockungsmitteln.

Chemie

In der chemischen Industrie steht jede Flüssigkeitsanalysemessung vor mehrfachen Herausforderungen wie chemisch aggressive Substanzen, Wartung, Sicherheit, Konsistenz und Zuverlässigkeit. In Rauchgasentschwefelungsanlagen, die Magnesiumhydroxid-Schlamm (Mg(OH)2) verwenden, wird der Verbrauch des Entschwefelungsmittels (Mg(OH)2) mit Online-pH-Analysatoren gesteuert.

Die pH-Messlösungen von Yokogawa sorgen für stabile kontinuierliche pH-Messungen über lange Zeiträume, reduzieren die Betriebskosten und machen eine manuelle Reinigung überflüssig.

Applikations-beschreibungen
Übersicht:

The term "cooling tower" is used to describe both direct (open circuit) and indirect (closed circuit) heat rejection equipment. Cooling towers are heat-transfer units, used to remove heat from any water-cooled system. The cooled water is then re-circulated (and thus, recycled) back into the system. Since the process water is re-circulated, the mineral concentration increases as a result of the evaporation. (AN10B01B20-01E)

Industry:Refining, Food and Beverage, Power, Oil and Gas, Pulp and Paper, Chemical

Industrien:
Applikations-beschreibungen
Übersicht:

There are a number of suppliers of oil and fat products used for edible purposes. These products include, but are not limited to olive oil, peanut oil, soybean oil, sunflower oil, lard, shortening, butter, and margarine. The raw materials for these products include animal by-products, fleshy fruits (palm and olive), and oilseeds. 

Industry:Food and Beverage

Applikations-beschreibungen
Übersicht:

One of the primary applications for high purity water is for boiler feed water. The measurement of pure water pH can be one of the quickest indicators of process contamination in the production or distribution of pure water. Effective chemical treatment of the feed water is vital in maintaining the useful operating life and minimizing maintenance costs of the boiler.

Industry:Power, Pharmaceutical, Common

Übersicht:

Control of sodium chloride (NaCl) concentration at a salt dissolver where solid salt is dissolved in water, is highly important because of the electrolysis efficiency. A conventional way of measuring the concentration of supersaturated NaCl solution had been performed by using non-contact type sensors (e.g., γ-ray density meter) since NaCl, impurities, and precipitates are in the solution.

Übersicht:

Most zinc are produced at hydrometallurgically, where a high-grade zinc product can be obtained and valuable metals mixed in the raw material can be recovered. In the hydrometallurgy, the raw material of zinc concentrate is roasted and then dissolved in sulfuric acid to remove impurities. The process called leaching and pH control of the leachate is important.

Industry:Chemical, Power

Industrien:
Übersicht:

The control of the world's water resource is arguably one of the most important issues. Water demand from industry and domestic users is set to rise throughout the industrialized world. Yokogawa has been applying minimized maintenance measurement systems.

Übersicht:

In the manufacturing process of Pharmaceutical, Chemical and Food & Beverage industries, the cleaning and sterilization of tanks and piping are done with various cleaning solutions, fresh or hot water and steam after manufacturing products. Clean-In-Place (CIP) is the system designed for automatic cleaning and disinfecting.

Applikations-beschreibungen
Übersicht:

Problems at the wet end of a paper machine can rarely be corrected down stream. That is why monitoring and controlling pH in pulp stock is critical to the paper making process. Essentially, at every stage in the manufacture of paper, correct pH values play a vital role. Variations in the pH value at the head box have a negative effect on the quality of the paper produced.

Übersicht:

Cyanide-bearing wastewater from mining and electroplating facilities and certain types of chemical plants is toxic and must be treated by oxidation with chlorine or chloride to bring the cyanide concentration within regulatory limits.

Industry:Electrical and Electronics

Übersicht:

The treatment of wastewater from pulp and paper plants is a serious environmental concern. Yokogawa's submersion holder with an ultrasonic+air-jet cleaner (customized product) can reduce the manual cleaning frequency to just once every one or two months.

Industry:Pulp & Paper

Industrien:
Applikations-beschreibungen
Übersicht:

Continuous technology improvement is ongoing in the pulp & paper industry to obtain the best possible performance. Problems at the wet end (stock preparation) can rarely be corrected downstream. That is why monitoring and controlling pH in pulp stock is critical to the paper making process. Essentially, at every stage in the manufacture of paper, correct pH values play a vital role.

Applikations-beschreibungen
Übersicht:

Reverse osmosis (RO) is a separation process that uses pressure to force a solution through a membrane that retains the solute on one side and allows the pure solvent to pass to the other side. More formally, it is the process of forcing a solvent from a region of high solute concentration through a membrane to a region of low solute concentration by applying a pressure in excess of the osmotic pressure.

Applikations-beschreibungen
Übersicht:

Sour Water is the wastewater that is produced from atmospheric and vacuum crude columns at refineries. Hydrogen sulfide and ammonia are typical components in sour water that need to be removed before the water can be reused elsewhere in the plant. Removal of these components is done by sending the sour water from the process to a stripping tower where heat, in the form of steam, is applied.

Applikations-beschreibungen
Übersicht:

Power plant boiler houses designed to burn coal or high sulfur oil are required by Federal and State pollution regulations to "scrub" (remove) sulfur dioxide from flue gasses to meet emission limits. SO2 in flue gasses is known to be harmful to the environment, as it is one contributor to the formation of acid rain. pH control is critical for the proper functioning of the scrubber system.

Industrien:
Applikations-beschreibungen
Übersicht:

For control of batch neutralization, a pH measurement coupled with a timer-controlled chemical feed scheme provides very satisfactory results.

This system can be adapted for either acid waste or alkaline waste neutralization.

Applikations-beschreibungen
Industrien:
Applikations-beschreibungen
Übersicht:

Wastes have been considered to be a serious worldwide environmental problem in recent years. Because of increasing pollution, these wastes should be treated. However, industrial wastes can contain a number of valuable organic components. Recovery of these components is important economically. Using conventional distillation techniques, the separation of acetic acid and water is both impractical and uneconomical, because it often requires large number of trays and a high reflux ratio. In practice special techniques are used depending on the concentration of acetic acid. 

Industrien:
Applikations-beschreibungen
Applikations-beschreibungen
Übersicht:

Sodium chlorate is an inorganic compound with the chemical formula NaClO3. It is a white crystalline powder that is readily soluble in water. It is hygroscopic. It decomposes above 300 °C to release oxygen and leave sodium chloride. Several hundred million tons are produced annually, mainly for applications in bleaching paper.

Applikations-beschreibungen
Übersicht:

In flue gas desulfurization systems that use magnesium hydroxide (Mg(OH)2) slurry, the consumption of the desulfurization agent (Mg(OH)2) is controlled by using online pH analyzers. A great concern in the pH measurement is heavy staining of the pH electrodes by the Mg(OH)2 slurry. To ensure accurate measurement, frequent cleaning of the electrodes with an acid is required, adding to both maintenance workload and cost.

Industry:Chemical, Power

Applikations-beschreibungen
Übersicht:

In stable dispersion of fine particles is the pre-requisite for the selective flocculation technique involving separation of ultra-fine valuable particles from the gangue. Among mineral processing techniques selective flocculation technique is known to have outstanding potential of capturing the particles of particular mineral in slurry of mixed mineral system by selective adsorption of water soluble polymers known as flocculants.

Applikations-beschreibungen
Applikations-beschreibungen
Übersicht:

Brewery is facility to produce beer. Breweries process is the manufacturing process of beer, which is a fermented beverage with low alcohol content made from various types of grain. Wheat, maize and other grains can be used for this. Brewing process starts from malted barley that is to form a mash by milling and mixing with hot water. The malt starches are converted to sugars during this process. This sugar rich water is then strained through the bottom of the mash and will be called as "wort". Then the wort will be brought to boil by bringing to the brew kettle. For bitterness or aroma hops are to be added at different times during the boil. Then the wort is cooled and aerated. And brewers yeast is added for fermentation. From the sweet wort the yeast produces carbon dioxide, alcohol and other byproducts. The GREEN BEER undergoes maturation after fermentation. Filtaration and carbonation are the last steps. Finally the beer will be stay in holding tank until it is bottled or kegged.

Applikations-beschreibungen
Übersicht:

After extraction from sugar cane or sugar beets, juice must be purified to remove the many other organics and minerals that accompany it. The processing to accomplish this is heavily dependent on reliable pH measurement and control as illustrated.

Übersicht:

Wastewater from electroplating facilities and certain types of chemical plants contains toxic forms of hexavalent chromium such as chromate and dichromate. The hexavalent chromium in this wastewater must be reduced before the water can be discharged. This requires a two-step process: hexavalent chromium (CR6) is reduced to trivalent chromium (CR3); and CR3 is precipitated as chromium hydroxide.

Industry:Electrical and Electronics

Übersicht:

 

 

Applikations-beschreibungen
Industrien:
Applikations-beschreibungen
Übersicht:

Fish perform all their bodily functions in water. Because fish are totally dependent upon water to breathe, feed and grow, excrete wastes, maintain a salt balance, and reproduce, understanding the physical and chemical qualities of water is critical to successful aquaculture. To a great extent water determines the success or failure of an aquaculture operation.

Applikations-beschreibungen
Industrien:
Übersicht:

The lifetime of a pH sensor has a significant impact on the overall annual costs of a pH measuring loop. Optimizing four key factors will decrease these costs and optimize process control and overall plant efficiency.

Übersicht:

To facilitate the accurate measurement of pH, and its presentation as a scale, a range of "standard liquids" or "buffer solutions" are used. These liquids, whose constituents are accurately defined, have known stable values. Although in the preceding text the relationship to hydrogen ions has been made, research has shown, that the activity of hydroxonium ions (H30+) is more relevant.

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