This sensor is specifically designed to be used in water- and wastewater treatment applications.
The specifications of the PH21 are lower than that of the FU20. For example, the PH21 can be used up to 60°C (140°F) and the FU20 105°C (221°F). The expected lifetime is 6-24 months, depending on the process conditions (pressure, temperature).
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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.