Conductivity measurement method

Dual-electrode conductivity method

An a.c. voltage (polarisation) is applied to two electrode tips The flow of current is directly proportional to the specific conductivity of the medium. Preferably used in pure media from 0.5 to 500 µS/cm (e.g. steam regenerators, condensate/feedwater tanks, steam generating units > PN 40, etc.).

SPECTORbus comprising:: LRG 1.-40 / LRR 1-40
SPECTORmodul comprising:: LRGT 1.-1 / LR. 1-5

Quadruple-electrode conductivity method

The quadruple-electrode method is used to improve the quality of measurement results and to prevent polarisation. With this measurement method, the electrodes carrying current are separate from those carrying voltage, enabling measurement without current and therefore without polarisation, and largely compensating for contamination. Preferably used in boiler water with a high conductivity of 100 to 10,000 µS/cm (e.g. industrial steam generating units up to PN 40).

SPECTORbus comprising:: LRG 1.-41 / LRR 1-40
SPECTORmodul comprising:: LRGT 16-2 / LR. 1-5

Temperature compensation

In plants with temperatures > 25 °C , the influence of temperature on conductivity is a vital consideration. Conductivity increases considerably due to electrolytic dissociation (decay of matter). Degree of dissociation ˜ 3 – 5%/ °C. With manual temperature compensation, the influence of temperature on a normal operating temperature and pressure is compensated by means of a comparative measurement conducted using a sample cooler. Fluctuations in pressure/temperature cause the measured conductivity to change. With automatic temperature compensation, the measured and displayed value is always based on 25 °C, as fluctuations in pressure/temperature are continuously compensated.

Separate text on conductivity monitoring systems

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