Evoqua WALLACE & TIERNAN SFC, Original Instruction Manual

Page: 155 / 288

SFC
Installation
5.
155
5.4 System shut down
Caution!
Risk of uncontrolled dosing of chlorine or pH-correction
medium! Shut down dosing system, close positioner!
If the installation site of the flow block assembly is not frost-free,
the system must be shut down in due time!
1 Switch off the power supply.
2 Drain the sample water supply line and drainage line (hold
container underneath)
3 Empty cell bodies and remove cleaning sand (see Page 223).
4 Dismantle the filter housing and the check valve housing.
5 When the remaining water has drained from the flow control
valve, refit the filter housing and the check valve housing.
6 Remove the sensors from the cell body cover and disconnect
from the cable.
7 Apply a KCI solution to the protection caps of the pH and
Redox electrodes and fit onto the electrodes.
Please note
A "KCI tank to store the sensors" may be used instead of the
protection cap for pH and Redox electrodes (see 8. “Complete
Units, Retrofit Kits and Spare Parts”).
The fluoride electrodes can be stored wet in the short term in a
100 mg/l fluoride solution at pH 7. Fill the electrodes in the
tank with 100 mg/l fluoride solution and mount on the
electrodes. However, the electrodes should be kept in a dry
condition if they are to be stored for several months. In this
case, drain the fill solution from the electrode chamber and
wash the membrane and chamber with distilled water.
Picture 13 Senor components
8 Store the sensors in a frost-free place.
Please note
The water must be drained if frost occurs.
Insert electrode in a beaker with water and store in a frost-free
place.
9 Procedure for membrane sensors, see
4.2.6 “Membrane sensors”.
A
B
C
D
E
A Sensor
B Sealing cap
C O-ring
D Tank
E Stand