Hach-lange ORBISPHERE 31xxx Installation and Maintenance Manuel d'utilisateur télécharger pdf (Page 35)

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Maintenance

5.4 Hydrogen sensor cell cleaning

Conditions

The hydrogen analyzer works on the principle that hydrogen molecules, passing through the

membrane, generate an electric current at the platinum anode surface. For this to take place, an

extremely clean metal surface is essential. If any film, grease or other impurity covers the

platinum surface, the reaction is impeded and may even be stopped.

In addition, the chemical reaction that takes place on the chloridized silver cathode leads to loss

of performance after a certain operation time.

As a result, a sensor service must be carried out to restore its original performance.

Method

The procedure for cleaning the H

2

electrochemical sensor requires the use of the

ORBISPHERE 32301 Sensor Cleaning and Regeneration Center. This procedure is explained

in detail in the 32301 Operator's Manual.

As an overview, H

2

electrochemical sensor cleaning consists of the following sequence of

operations:

• Dechloridization of the cathode: This process removes the chloride film from the silver

cathode surface (carried out by the ORBISPHERE 32301).

• Rechloridization of the cathode: A layer of silver chloride is grown on the cathode's surface

(carried out by the ORBISPHERE 32301).

• Activation of the platinum anode: The center anode surface is polished, and treated with

nitric acid.

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