22
11.2
Operating conditions of the sensor
The accuracy of the sensor is influenced by
the quality of the water, particularly by
deposits of iron, high concentrations of
heavy metals, chlorine or salt and microbi-
ological contamination. The sensor must
be changed at the latest when sensor
exchange is signalled.
Required water conditions:
-
natural raw water with a hardness
value between 0.18 mmol/l up to 10.8
mmol/l
-
water temperature: 5... 30 °C
-
pH-range: 5...9 pH
-
chlorine content: < 500 µg/l
-
germ content: < 5.000 cfu/ml
The water has to be free of acids, bases incl. brine and other basic liquids, tensides,
oils, solvents and heavy metals.
11.3
Sensor mounting/Sensor replacement
The request for sensor replacement will be signalized by flashing of all the three LEDs.
For the sensor replacement please act according the following procedure:
1.
Remove power supply unit resp. disconnect the power supply.
2.
Wind down the safety bolt of the sensor to the plug socket of the device and pull the
hardness sensor out of the socket.
3.
Press down the clamping ring at the T-fitting (flow chamber) in which the sensor is
mounted and remove the sensor straight from the flow measuring chamber.
4.
Take the new sensor out of the box and pull it out of the protective cap straightly
Do not touch or damage the sensible sensor part!
5.
Plug the new sensor tight and vertically into the T-fitting (flow chamber). Please avoid
mechanically touching of the tube while doing this.
6.
Verify that the sensor is firmly in place by pulling it lightly.
7.
For plugging the sensor in, please turn it to the right position.
The connection plugs are
equipped with an inverse-polarity protection. Please note that the connection must be
come off very easily.
The sensor cable must engage hearable and tightly! If you need more effort
to plug the sensor in, the electrical connection will be damaged!
8.
Screw the safety bolt of the socket of the hardness sensor (keep inverse-polarity protec-
tion in mind)
9.
Plug the power supply unit in resp. connect the power supply. The device checks the sen-
sor plug-in connection at decommissioning and signals sensor alarm if it not recognizes
the new sensor. In this case disconnect the device once again and check the plug-in con-
nection of the sensor.
10.
Sensor mounting/replacement has been successfully completed if the device recognizes
the new sensor and starts with measuring operation.