pH/ORP Sensors PH8EFP, PH8ERP, OR8EFG, OR8ERG

Yokogawa's pH and ORP analyzers are highly reliable. They feature advanced functions and are useful for a wide variety of applications including water quality management in a broad range of production processes and in medium-sized wastewater treatment plants, or as general pH and ORP control systems.

Based on Yokogawa's track record and years of experience, a comprehensive range of products has been produced to provide solutions best suited to individual applications.

In addition to the PH8EFP, PH8ERP, OR8EFG and OR8ERG standard Ryton pH and ORP sensors, specialty pH and ORP sensors are available for various applications.

Ryton pH/ORP sensors PH8EFP, PH8ERP, OR8EFG, OR8ERG

  • With a body made of Ryton, a strong engineering plastic which is comparable to Teflon in terms of corrosion resistance and heat resistance, a wide range of applications are possible.
  • A single type of electrode can support all applications regardless of whether a holder or cleaner is used.
  • The integrated-electrode design simplifies calibration with standard solutions and maintenance.
  • The glass electrode of a pH analyzer, the platinum or gold electrode, and the junction of an ORP analyzer can each be easily replaced.

1. pH Sensors
1-1. KCl Refillable Type Electrode PH8ERP

Measured object Hydrogen ion concentration (pH) in aqueous solution
Measurement principle Glass electrode method
Measuring range pH 2 to 12
Measuring temperature -5 to 80℃
Measuring pressure Atmospheric pressure to 50 kPa
Temperature compensation sensor Pt1000
Weight Approx. 0.4kg


1-2. KCl Filling Type Electrode PH8EFP

Measured object Hydrogen ion concentration (pH) in aqueous solution
Measurement principle Glass electrode method
Measuring range pH 0 to 14
Measuring temperature -5 to 105℃
Measuring pressure Atmospheric pressure to 10 kPa (General purpose or big volume tank 500 ml)
Atmospheric pressure to 500 kPa (Medium pressure)
Temperature compensation sensor Pt1000
Weight Approx. 0.4 kg


2. ORP Sensors
2-1. KCl Refillable Type Electrode OR8ERG

Measured object Oxidation-Reduction potential in aqueous solution
Measurement principle Metal electrode method
Measuring range -1500 to 1500 mV
Measuring temperature -5 to 80℃
Measuring pressure Atmospheric pressure to 50 kPa
Weight Approx. 0.4 kg


2-2. KCl Filling Type Electrode OR8EFG

Measured object Oxidation-Reduction potential in aqueous solution
Measurement principle Metal electrode method
Measuring range -1500 to 1500 mV
Measuring temperature -5 to 105℃
Measuring pressure Atmospheric pressure to 10 kPa (General purpose or big volume tank 500 ml)
Atmospheric pressure to 500 kPa (Medium pressure)
Weight Approx. 0.4kg
Overview:

Introduction

Pigment producer manufacture produces pigments to supply to paints, plastics, inks, construction, textile and cosmetics manufacturers etc. The pigments come under wide range - general purpose grades, high performance, and specialist hard-to make colours and effect pigments.

Pigments and chemicals form an intrinsic part of many industries. They serve as raw materials in the manufacturing of Plastic, Rubber, Paint, Paper, Textile, Tiles, Detergent Powder and Soaps, Inks, and Photo Films etc.

Pigments come in a wide variety of colours and some are water-soluble. For these reasons, many of these compounds have been produced, isolated, and characterized.

Among the most important variables affecting processes, pH and temperature are environmental conditions with a strong effect on the pigments. Thus, it is very important to control them in industrial bioprocesses.

Balancing the pH

The degree of acidity or alkalinity of a solution, known as pH, is measured from 0 to 14. Acid solutions measure 0 to 7. Alkaline (smells like ammonia) solutions measure 7 to 14. Pure distilled water measures 7. There are instruments to measure pH, or you can rely on sense of smell. The binder should have a slight ammonia odor. We are shooting for a pH range of 8.0 to 8.8. The acrylic polymer used to make paint becomes unstable at a pH below 7.5. Adding a dispersion may lower the pH below the optimum range. Also, adding thickeners will typically lower the pH. If polymer binder starts looking and acting like cottage cheese then chances are pH is too low. Try raising the pH to salvage the batch. Do this with the drop-wise addition of Ammonium Hydroxide (NH4OH) while mixing. If the mixture does not respond to the pH correction, allow it to dry out for disposal.

Controlling Viscosity and Rheology

Thickness or viscosity is generally well understood. Rheology usually bears a bit of explanation. Long rheology refers to a stringy, resinous, quality, like that of honey. Industrial enamels and automotive paints often exemplify these qualities. Short rheology refers to a smoother, less "ropy" paint formulation, typical of what acrylics and oil paints are known to be. To create different rheologies, you can choose the appropriate gel or medium to combine with the dispersion. These are pH sensitive polymers that swell up when the paint's pH is 8.0 - 9.5 (It is critical to keep the paint in this range.)

Ammonia is used to maintain the pH in the acceptable range. Ideally, this is determined with a pH meter, and is characterized by a slight ammonia odor. You will feel the mixture get thicker as you proceed. (If you are getting chunks it may be a result of adding the Thickeners too quickly or insufficient mixing.) Blend until the mixture is smooth and of the desired thickness.

Typical Process details as an example:

Typical problems 

  1. What is the concentration of these chemicals?
    • Customer may say it is difficult to give concentration of these chemicals.
  2. What is the process pressure?
    • Process pressure: atmospheric pressure
  3. Calibration frequency
    • Once in a day. Customer has observed drift of @1 PH every day i.e. why calibration is done daily.
  4. Scaling?
    • Yes scaling shall be observed on electrode
  5. CIP/SIP
    • No.
  6. Typical sensor life @1 1/2 months to max. 2 months
  7. Process temp.
    • varies from -5 to +105 deg C, typical batch process temp. will be 95 degC (changes from manufacturer to manufacturer)

Remedies

  • Use sensor with most chemically resistant Ryton body.

Product Recommendation

Measurement System

Process Liquid Analyzer: 

2-wire FLEXA pH/ORP Analyzer

Features

  • Dual sensor measurement on 2-wire type analyser
  • Indication of sensor wellness

 

  • 4-wire PH450G pH/ORP Analyzer

Features

  • Easy touchscreen operation
  • Trending display up to 2 weeks
  • Advanced Process Temperature Compensation

Sensor Selection:

pH immersion fitting like PH8HS / equivalent with PH8EFP sensor.

Features

  • With the body made of Ryton, a strong engineering plastic, which is comparable to Teflon in terms of corrosion resistance and heat resistance, it allows for a wide range of applications.
  • The integrated-sensor design simplifies calibration with standard solutions and maintenance.
  • The pH glass electrode of a pH sensor, the platinum or gold electrode of a ORP sensor and junction can be individually replaced.

Tangible benefit

More reliable and accurate analysis of pH which helps to improve end product quality and total operation cost is less.

Note: For additional information on this application contact the local Yokogawa Process Liquid Analyzer Department

Industries:
Overview:

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

Overview:

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

Overview:

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.

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