Hysteresis Limit - ProMinent DULCOMETER Assembly And Operating Instructions Manual

Compact controller ph/redox measured variable

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8.4

Hysteresis limit

Measured value

Upper

limit value

"Hysteresis"

Lower

limit value

Limit value

transgression

Fig. 35: Hysteresis

Upper limit value = LIMIT↑

Lower limit value = LIMIT↓

The range between LIMIT↑ and LIMIT↓ is the valid measuring range.

The DULCOMETER

Measured variable

Redox

'Hysteresis' acts to cause an increase in the limit value transgression, i.e. if the

The

'Limit↑ ' of e.g. pH 7.5 was exceeded, then the criterion for a limit value transgression is

only removed again when the value falls below pH 7.22. The hysteresis behaviour for a

'Limit↓ ' functions in an analogue way (the hysteresis value is here added to the

Limit↓ ), for example

gression criterion is only removed again when the pH exceeds 4.28.

Compact Controller has fixed

'Limit ↓ ' pH 4.00, hysteresis pH 0.28, then the limit value trans‐

Control parameters and functions

'hysteresis' .

Hysteresis

0.28 pH

20 mV

A0009_GB

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