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The P65R8 has two pH measurement circuits - one for process measurement and one for internal reference - each containing a common titanium return electrode. The difference between the two circuits is the true process pH. With this design, the pH sensor maintains its accuracy and stability in aggressive process applications long after traditional combination-style sensor performance deteriorates.
The P65R5 features a built-in RTD in the sensor tip provides automatic temperature compensation, for rapid response in fluctuating process temperatures. Call Lesman to upgrade to a single sensor that outputs both pH and temperature at the same time.