Application Examples For The Phase Limit Detector - Endress+Hauser CUS 5 Montage- Und Betriebsanleitung

4. Commissioning
Fig. 4.5 Application of the CUS 5
as a limit detector,
example 1
Fig. 4.6 Application of the CUS 5
as a limit detector,
example 2
26
4.4

Application examples for the phase limit detector

Example 1:
In normal operation, a relatively clear medium
falls in the turbidity range labelled A and re-
sults in a current output between 4 and 8 mA.
If a turbid medium is now introduced, a
connected controller should become active.
For this to occur, the controller must be set
so that it switches on as soon as the current
mA
Example 2:
A very turbid medium falls in the turbidity
range A in normal operation (e.g. digested
sludge) and results in a low current output.
This means that the phase limit to a clear
medium can only be detected if its
mA
output clearly increases (e.g. 2 mA) above
8 mA. This functions only if the turbidity of the
introduced medium falls in the range B and
not in the range C, where the current output
value cannot be clearly distinguished from
that of normal operation in range A.
Medium A:
Medium B:
The indistinguishable
turbidity range C:
Turbidity g/l
12 g/l
concentration lies in a range B, where a
sufficiently higher current output can be
discriminated.
Medium A:
Medium B:
The indistinguishable
turbidity range C:
Turbidity g/l
12 g/l
Turbidity sensor CUS 5
0 - 1 g/l 4 - 8 mA
2 - 12 g/l 10 - 20 mA
1 - 2 g/l and 12 - 40 g/l
16 - 40 g/l 4 - 8 mA
10 - 20 mA
2 - 12 g/l
0 - 2 g/l and 12 - 16 g/l
Endress+Hauser