EUTECH INSTRUMENTS CYBERCOMM 5000 FOR CYBERSCAN 5000 Manual de instrucciones descargar pdf (Pagina 164)

Instruction Manual CyberScan PC5500/ 5000

159

Reference electrodes typically consist of three elements: an internal

reference electrode, a filling solution, and a reference junction

through which the filling solution can “flow”, and provide electrical

contact with the sample and the internal reference electrode. The

most convenient internal reference electrodes are made from a metal

(such as silver or mercury) and its sparingly soluble salt (silver

chloride or mercurous chloride). The filling solution is most often a

concentrated solution of potassium chloride. Most problems with

reference electrodes are associated with the interrupted or blockage

of flow of the potassium chloride fills solution through the reference

junction.

The classic electrode pair separate pH indicating and reference half

cells, offer you unmatched versatility to match the needs of your

sample. This approach makes for the highest accuracy, as well as

low replacement costs, since usually only one of the pair is broken or

malfunctioning.

However, the pH reading indicating half-cell and the reference half-

cell can be merged into one electrode- a combination electrode.

Combination electrodes are quite popular for they offer distinct

advantages in convenience and compactness. Some combination

electrodes also incorporate a ATC probe into their body also,

providing temperature readout and compensation with meters

equipped with these features. Newer combination electrodes are

available in which the glass pH membrane sensor has been replaced

with a field effect transistor or FET. All CyberScan Series 5000

meters are capable of using this type of electrode by direct

connection.

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EUTECH INSTRUMENTS CYBERCOMM 5000 FOR CYBERSCAN 5000 Manual de instrucciones Pagina 164