FAS622en_pH measurement
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2 Measurement<br />
dance converter (JUMO Data Sheet 20.2995), that screws on to the electrode, is recommended. It<br />
reduces the high internal impedance of the electrode and allows good signal-stabilized transmission<br />
of the measured value to the connected transmitter.<br />
2.1.4 Transmitter/controller<br />
One of the tasks of the transmitter is to convert the high-impedance signal of the <strong>pH</strong> electrode to<br />
the <strong>pH</strong> scale, and to make this available once again as an indicator and/or standard signal. The<br />
transmitter normally incorporates a calibration routine for adjusting the electrode with buffer solutions.<br />
The transmitters are often designed to operate as controllers at the same time, so that they can<br />
perform dosing of acids and alkalis for <strong>pH</strong> correction, for example. In addition, the transmitter<br />
takes account of the temperature, either by a manual entry option, or by a separate <strong>measurement</strong><br />
input for the temperature sensor.<br />
Fig. 12: <strong>pH</strong> transmitter/controller JUMO dTRANS <strong>pH</strong> 01<br />
Fig. 13:<br />
JUMO AQUIS 500 <strong>pH</strong> - Transmitter/controller for the <strong>measurement</strong> of <strong>pH</strong>,<br />
redox potential and ammonia concentration and temperature<br />
20 2 Measurement JUMO, FAS 622, Edition 04.07
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