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HI 700 and HI 710 Conductivity Controllers
Commonly used in boiler, cooling tower and electroplating applications, conductivity is also used in brewery, food, paper/textile and detergent manufacturing processes.
The "Technical Info" area of this website discusses conductivity measurement in greater detail. (see blue underlined link below)
Process controllers shown below are used for all of the applications listed above.
Probe, HI 7639:
The recommended sensor (HI 7639) for this controller uses a four ring potentiometric method of measuring conductivity. The rings are made of platinum and provides a more stable measurement over a wide range. Unlike conventional sensors, this probe does not need frequent calibration. And because of its design, polarization is not an issue. The internal RTD provides the controller with automatic temperature compensation.
Transmitter, HI 8936:
Using a similar sensor (HI 7638) the Hanna Conductivity Transmitter series allows a temperature compensated analog signal to be input to the controller. The transmitters require 24vdc external power to energize the loop current.
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