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Differential pH Sensors

Compared with a typical combination pH probe, differential pH sensors work slightly differently. While combination pH sensors have 2 electrodes, a measuring and a reference electrode, differential pH sensors have 3 electrodes. In the differential design, 2 electrodes measure pH differentially with respect to a third metal ground electrode. This design has the advantage of preventing reference fouling, making it ideal for industrial applications like wet scrubbers.

differential pH sensors

Laboratory pH Sensors

Combination pH sensors in 12mm glass and plastic bodies are commonly referred to as laboratory style sensors. These sensors work well in light duty applications such as education and research, environmental sampling, and pool monitoring. While the basic design is the same, features like the sensor fill, junctions, and cables can be changed to fit different application needs.

Process pH Sensors

Combination pH sensors can also be built in larger, sturdier bodies with process connections (like NPT threads) built in. These sensors are commonly referred to as process pH sensors, and they are well-suited for continuous monitoring of pH. Process pH sensors are typically mounted in a pipe, submerged in a tank, or used as part of an insertion assembly.

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