All-in-one pH sensor uses patented compensation technique that extends life and accuracy

Citation

(2001), "All-in-one pH sensor uses patented compensation technique that extends life and accuracy", Sensor Review, Vol. 21 No. 1. https://doi.org/10.1108/sr.2001.08721aad.002

All-in-one pH sensor uses patented compensation technique that extends life and accuracy

All-in-one pH sensor uses patented compensation technique that extends life and accuracy

Keywords: Sensors, Temperature sensors

The new PH20 combination sensor from Yokogawa is an "all-in-one" device for measuring pH, ORP/redox (oxidation reduction potential) and temperature (see Plate 2).

The new device uses a patented compensation technique to minimise drift and enhance accuracy in conditions of varying temperature and pressure. In addition, its rugged mechanical construction and chemically resistant packaging mean that it can be used under environmental conditions where other sensors would be destroyed.

Plate 2 The Yokogawa PH20 combination sensor for measuring pH, ORP and temperature

The PH20 incorporates flexible plastic sleeves that flex to accommodate changes in the external pressure, thereby avoiding large differential pressures across the sensor reference diaphragm and ensuring that the reference junction's environment remains constant.

The sensor body is made from chemically resistant PVDF, and the silver chloride reference system is based on a double-junction design with a gelled electrolyte to combat poisoning of the internal reference element. The platinum electrode serves both as the measuring element for ORP measurements and as the solution ground electrode.

The body features parallel threads and O-ring seals on both front and back, allowing the use of simple adaptors and standard plumbing accessories for a variety of inline, bypass and immersion assemblies. Each sensor is supplied complete with a test certificate.

Yokogawa supplies an extensive range of diagnostic instruments for processing and analysing pH sensor data.

For further information contact Yokogawa UK Limited, Stuart Road, Manor Park, Runcorn, Cheshire, WA7 1TR, UK. Tel: +44 (0)1928 597100; Fax: +44 (0)1928 597101; E-mail: www.yokogawa.co.uk