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Example: Measuring Range Assignment of a Measuring Cell with CLS 52, Rising
Characteristic
The measuring range is determined by the conductivity values defined for 0 or 4 mA
and 20 mA.
The difference between the 20 mA value and the 0/4 mA value must be greater than
the current output spread TD of the switching step in which the 20 mA value is located.
If a value of 300 µS/cm is assigned to 20 mA, then the 0/4 mA value must be at least
200 µS/cm lower (TD for switching step 1).
Possibilities 100 µS/cm to 300 µS/cm
or 0.0 µS/cm to 300 µ/cm
but not 150 µS/cm to 300 µS/cm!
B) Bilinear Current Output Signal Characteristic
Figure 7.3
Current output signal
with bilinear characteristic
The measured value for the break point must be less than (20 mA value - TD). The 0/4 mA
value is 0 S/cm in all cases.
C) Logarithmic Current Output Signal Characteristic
Figure 7.4
Current output signal
with logarithmic
characteristic
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