Engineering Skill Set
The ultimate problem with pH measurements is often limited or no process control. In each of these cases, the main question is: "How can I make sure I have a reliable pH measurement and extend the lifetime of my pH sensor?"
Here are the four lessons that are common among top engineers:
Lesson 1: Use a Step-by-Step Approach
First of all, following a logical structure in case of troubleshooting will help drill down the cause of the problem systematically. The sequence of this step-by-step approach is:
Lesson 2: Patience
The second important lesson is patience. Hasty conclusions may not always be correct conclusions. For example, if a pH cable looks dirty, it might be tempting to blame it on a faulty cable. But, after following the four step-structure above, another cause may become visible.
Proper calibration also requires patience. Top service engineers when performing pH sensor calibrations waited a bit longer after getting a stable signal, before moving onto the second buffer. This is important because an analyzer is a computer and will only give a stable signal when the mV value has not changed for five seconds (standard setting). Remember sensors that have been installed for some time will become slower. To increase the accuracy it is important to be patient and take a few seconds more.
Lesson 3: Slope and zero of a pH sensor
Understanding the meaning of slope and zero of a pH sensor with help indicate the health of the sensor:
- Slope < 80 % = sensor needs to be replaced
- Zero higher than +40 mV = sensor needs to be replaced
- Zero lower than – 40 mV = sensor needs to be replaced
Lesson 4: Temperature effects
Temperature affects the lifetime of a pH sensor. Every 10°C decrease in temperature will double the lifetime of the sensor.
Learning these four lessons will help improve engineers’ skills and most importantly extend the life of the pH sensors.
- Step-by-step approach
- Slope and zero of a pH sensor
- Temperature effects
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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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