Function; Operation; Decommissioning And Storage - Grundfos Conex DIA-1-A PA/HP Montage- Und Betriebsanleitung

11.3 Function

The preassembled electrochemical systems
®
Conex DIA-1-A, PA/HP-PA, Conex
®
Conex DIA-2Q-A, PA/HP-PA or Conex
are used for measuring and controlling the concentrations of
peracetic acid or hydrogen peroxide in water.
The concentrations of the disinfection agents are measured by
the measuring cell types for peracetic acid (95701375 (314-700))
or hydrogen peroxide (95701376 (314-800). They are resistent
against tensides and comparable water additives.
• The sensor is separated from the sample water by a special
diaphragm.
– The disinfection additive in the sample water (peracetic acid
or hydrogen peroxide) diffuses through the diaphragm and
is reduced at the electrode.
– The electrochemical reaction produces an electrical
measuring signal which is proportional to the concentration
of peracetic acid or hydrogen peroxide.
• The instrument amplifier and controller Conex
®
Conex DIA-2Q has the following functions:
– amplification of the electrical signal (current or voltage)
– calculation of the concentration using the calibration
parameters
– indication of the concentration as a digital value
– control of a final control element, for example a dosing
pump.
14
®
DIA-1-A, PA/HP-HP,
®
DIA-2Q-A, PA/HP-HP
®
DIA-1 /

11.4 Operation

All settings must be made with the instrument
Note amplifier and controller Conex
®
Conex DIA-2Q.
See the installation and operating instructions for the
® ®
Conex DIA-1 / Conex DIA-2Q!
During operation, the measuring cell and amplifier
must run continuously!
Caution
The measuring cell must not become dry!

11.4.1 Decommissioning and storage

1. Switch off the power supply.
2. Turn off the sample-water supply.
3. Remove the measuring cell.
4. Unscrew the diaphragm cap.
When unscrewing the diaphragm cap and cleaning,
strictly follow the instructions in section
13.2 Maintenance of the measuring
Caution
Otherwise, the diaphragm and the electrode may be
damaged!
5. Clean the electrode shaft and the diaphragm cap with clean
water, and let the cell parts dry at a dust-free place.
6. Loosely screw the dry diaphragm cap onto the electrode shaft.
During storage, the diaphragm must not touch the
Caution
electrode!
11.4.2 Recommissioning
1. Clean the electrode tip with the enclosed special emery paper.
2. Fill up with the enclosed electrolyte using a new diaphragm
cap, if necessary.
When cleaning the electrode and filling up with
electrolyte, strictly follow the instructions in section
13.2 Maintenance of the measuring
Caution
Otherwise, the measuring cell may not function
correctly!
®
DIA-1 /
cell.
cell.