EUTECH INSTRUMENTS ALPHA CON 190 18 DIN CONDUCTIVITY CONTROLLERTRANSMITTER Manual de Instruções descarregar pdf (Página 34)

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Appendix 1: Asymmetrical / Symmetrical Mode

The αlpha pH 190 controller can be operated in the asymmetrical or

symmetrical modes (See Set up Program P3.2).

Asymmetrical mode:

Asymmetrical mode works well in environments where there is little or

no electrical noise. When there is noise, the noise acts as a common

signal, which is picked up by both the pH and the reference

electrodes.

However, since the reference electrode is grounded to the ground

potential of the amplifier, electrical noise will be present only on the pH

electrode. This noise is amplified along with the pH signal, which

causes fluctuations in the pH or ORP readings.

Electrical noise from a DC source (as in an electroplating tank) will

typically result in stable but incorrect values.

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EUTECH INSTRUMENTS ALPHA CON 190 18 DIN CONDUCTIVITY CONTROLLERTRANSMITTER Manual de Instruções Página 34