Environmentally Conscious Industrial pH Meter HP-48/96 Series

*Section Leader of Third Division of Design Department, HORIBA Advanced Techno Co., Ltd.

In the newly developed and environmentally conscious HP-48/96 series industrial pH meter, lead has been eliminated from solder joints on the printed-circuit board in the indication converter section, and lead-free glass materials have been used for the pH electrode body. Resistance of the pH response glass membrane to chemical attack has been increased by improving its composition. At the same time, it became possible to use lead-free glass but this glass is difficult to make using conventional glass processing technology, in terms of heat characteristics. The use of lead-free glass has consequently allowed conformity with the RoHS directive (elimination of hazardous substances) within the EU. This is the first time this conformity has been achieved in this industry. Though the thickness of the pH electrode is approximately 0.1 mm using the traditional type, the durability and physical strength has been improved by forming a glass thickness of up to 1mm maximum. This improves the duration of the pH electrode, especially when used in severe conditions, which results in a reduction of the exchange frequency and therefore less industrial waste.

(Same content in Japanese is in Readout No.31-Japanese edition-.)

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