Endress+Hauser CCS50D Operating Instructions Manual page 22

Installation
3. Screw union nut onto assembly on block.

 9 Flowfit CCA151 flow assembly
1 Disinfection sensor
2 Flowfit CCA151 flow assembly
3 Union nut for securing a disinfection sensor
5.2.4 Installing sensor in CCA250 assembly
The sensor can be installed in the Flowfit CCA250 flow assembly. This allows a pH and an
ORP sensor to also be installed, in addition to the chlorine or chlorine dioxide sensor. A needle
valve controls the flow in the range of 30 to 120 l/h (7.9 to 31.7 gal/h).
Please note the following during installation:
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The flow rate must be at least 30 to 120 l/h (7.9 to 31.7 gal/h). If the flow drops below
this value or stops completely, this can be detected by an inductive proximity switch and
used to trigger an alarm with locking of the dosage pumps.
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If the medium is returned to an overflow basin, pipe or similar, the resulting
counterpressure on the sensor must not exceed 1 bar (14.5 psi) and must remain constant.
‣
Negative pressure at the sensor, e.g. due to medium being returned to the suction side of a
pump, must be avoided.
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CCS50D
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Endress+Hauser
A0034261