The pH sensor that turns measurement on its head

The pH sensor that turns measurement on its head

11. April 2022

pH sensors are used at several different points in the process. This is easy to plan for in new plants. In existing plants, however, there are often a number of restrictive boundary conditions to consider. There is often no space where the device should be installed because of numerous installations and attachments, or accessibility is poor. The sensor must also be installed in such a way that the sensor head takes the measurement at the correct and appropriate point in the medium. This can be difficult and/or require complex fittings and further limits the choice of space, especially for partially filled pipes and vessels.

Sensor limitations = things can get tight

If the sensor also has limitations, things can get tight. For example, the installation position of many pH sensors is limited by their internal structure. An air bubble present in the sensor for pressure compensation (e.g. in case of temperature fluctuations) would influence the measurement if it rises into the measuring head in the upward-facing sensor, so that there are generally positional restrictions for the sensor:

                                                                                                                             Nutzbarer Winkel = Usable Angle

This does not apply to the Yokogawa sensors FU20 and FU24. Their air bubble inside is so small that it does not influence the measurement, but still enables pressure compensation. FU20 and FU24 are therefore true 360° sensors that can also be integrated into the process from below or at an angle, i.e. upside down:

                                                                                                                               Nutzbarer Winkel = Usable Angle

FU20 and FU24 create the greatest possible freedom in the choice of measuring point. With these 360° sensors and the PR10 installation fitting, many an unreachable measuring point can be reached after all. So you don’t have to turn the process upside down, just the sensor.

FU20-Sensors

FU24-Sensors

Valve PR10

For more details on FU20, FU24 and PR10, please visit our website Liquid Analyzers | Yokogawa United Kingdom Ltd.

Why do FU sensors actually look so different from pH sensors? That will be the topic of our next post on liquid analysis!


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