Cleaning and calibration will always involve some amount of maintenance. Where is the most attention required?
A clean reference should have a potential difference of 0 mV across the junction (it has open pores). On the other hand, dirty references will have a potential difference across the junction. Why is this important?
When measuring pH, the potential difference generated by the process across the pH-sensitive glass membrane is a measure for the pH of the process. This value needs to be compared to the reference, which should, of course, be approximately 0 mV.
However, when the reference sensor is dirty, a potential difference is generated across the junction resulting in the measurement having a slower response rate. In fact, total blockage of the reference will result in a non-responsive measurement. This is what we call a “CHANGEABLE effect.” Luckily, by regular cleaning of the reference sensor, this effect is easily reversed, increasing the sensor lifetime.
A dirty pH-sensitive glass bulb will result in a slow measurement. This - again - is a CHANGEABLE effect, and by regularly cleaning the sensor, the sensor lifetime will increase, and the response rate of the sensor will be at its best.
Each application is different, and optimizing the maintenance cycle is not always straightforward. In some cases, cleaning once a week is sufficient, but when a lot of dirt builds up, or the deposits are very heavy, it can be necessary to clean as often as every eight hours! To complicate things further the type of cleaning liquid required can be different for each application.
Total Cost of Ownership
The initial cost of buying one pH measuring loop is almost the same as one-year maintenance, calibration, and sensor replacement costs. That means by extending the lifetime of a pH sensor the annual costs of these three will go down.
Read more and download our free pH eBook to learn about the best practices that can extend the lifetime of a pH sensor.
Yokogawa has been serving the bulk chemical market globally and is the recognized leader in this market. With products, solutions, and industry expertise, Yokogawa understands your market and production needs and will work with you to provide a reliable, and cost-effective solution through the lifecycle of your plant.
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Chemical plants rely on continuous and batch production processes, each posing different requirements for a control system. A continuous process calls for a robust and stable control system that will not fail and cause the shutdown of a production line, whereas the emphasis with a batch process is on having a control system that allows great flexibility in making adjustments to formulas, procedures, and the like. Both kinds of systems need to be managed in available quality history of product, and to be able to execute non-routine operations. With its extensive product portfolio, experienced systems engineers, and global sales and service network, Yokogawa has a solution for every plant process.
Cogeneration or combined heat and power (CHP) is an efficient approach to generating power and thermal energy from a single fuel source.
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Food & Beverage
The food and beverage industry must produce safe, high-quality foods and beverages for consumers. In addition to quality control, the manufacturing processes include many challenges such as managing ingredients, improving efficiency and handling global environmental issues. Yokogawa leverages its decades of technological expertise to help customers build and operate the ideal factory.
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Iron & Steel
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Highly reliable YOKGOAWA production control systems, which have been proven thorough extensive global projects, are installed in 76 trains of LNG liquefaction facilities and continues to improve the safeties, efficiencies and productivities. Also, YOKOGAWA contributes to maximize the revenue by enabling the efficient operation to the complex liquefaction process via APC (Advanced Process Control) license with consulting.
LNG Regasification & Storage
YOKOGAWA's production control systems are operated at 54 LNG receiving terminals around the world, and 2/3 of the terminals in Japan. YOKOGAWA contributes to stable and efficient gas supply at LNG receiving terminal through the total process, loading, storage, regasification, and metering.
LNG Supply Chain
YOKOGAWA has been engaging in LNG automation by supplying the latest sensors, analyzers, control and information systems for more than 50 years since LNG was first imported to Japan. YOKOGAWA is one of the biggest automation suppliers to the worldwide LNG supply chain, liquefaction, transportation, and regasification.
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Mining operations produces valuable minerals or geological materials from the Earth. Economical recovery often requires high throughput and high availability of the process with low operation costs, and stringent safety and environmental regulations.
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The oil & gas downstream industry has been facing an increasing number of challenges in recent years. These include the changing characteristics of the feedstock to be processed, aging of process facilities and equipment, rising cost of energy, lack of skilled plant operators who can run a refinery safely and efficiently, and the ever-changing requirements from both the market and the customer.
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Specialty & Fine Chemical
Yokogawa has long served customers in the specialty and fine chemicals market. With a market leading batch solution that offers the best in class reliability and flexibility as well as industry experts who understand the complex requirements in designing a batch solution, you can be assured that in your partnership with Yokogawa you will have a system that will enable you to produce products that meet your customers’ needs in the future while maintaining safety and regulatory compliance.
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Yokogawa provides optimum solutions to improve the reliable operation of water treatment plants. These solutions include sophisticated technologies, unsurpassed product quality, and extensive application know-how throughout the lifecycle.
Related Products & Solutions
All-in-One pH/ORP Sensor Series FU20 and FU24
The FU20 and FU24, all-in-one pH and ORP, sensors show how Yokogawa applies the motto "Simple is best" to sensor technology.
Differential pH/ORP Sensors
The cation differential pH and ORP sensors were designed for difficult applications where conventional sensors are ineffective. These include measurements such as brine solutions to applications as diverse as electrolysis processes and cheese manufacturing.
Industrial pH/ORP Electrodes
The heart of a pH measuring loop is the electrode system. Yokogawa has designed a wide range of electrodes to ensure this heart keeps beating under the most severe conditions.
pH/ORP Buffer Calibration Solutions
Buffer solutions are needed as an indispensable tool for maintaining an accurate pH measurement. Buffer solutions are used as references points for calibration and adjustment of pH measurements to compensate for aging and deterioration.
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.
Pharmaceutical pH and ORP Electrodes and Fittings
These sensors feature the latest innovations in pH glass formulation, reference systems, and reference electrolytes. They offer supperior accuracy and stability, even after repeated sterilizations.
Pure Water pH and ORP Sensors
Achieving accurate and reliable readings using a traditional pH analyzer is challenging, however with the right equipment stable and accurate pure water pH measurements can be accomplished. Yokogawa's specialized bellomatic pH sensor is proven best solution for high purity water applications. For those individuals that do not like the maintenance of refilling sensors, then the FU24 which incorporates the successful patented bellow system in an All-in-one body is the ideal solution.
pH and ORP Analyzers
pH and ORP meters, analyzers and transmitters are used for continuous process monitoring of pH and ORP to ensure water/product quality, monitor effluent discharge, batch neutralization, pulp stock, scrubbers, cooling towers, chemical, water/wastewater treatment and many other applications.
pH and ORP Sensors
- pH and ORP sensors
- Proper pH electrode/sensor selection critical for optimal measurement results
- Installation options include retractable, flow thru, immersion, and direct insertion