Evoqua DEPOLOX, Инструкция по эксплуатации

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3. Description DEPOLOX® 400 M
16
EN
The sample water flows tangentially into the
3-electrode cell ensures continual hydro-
mechanical cleaning of the sensor electrodes
with a special cleaning sand and thus prevents
the natural contamination of the electrode
surfaces. Clean electrode surfaces and a cons-
tant flow of sample water are critical for high-
quality oxidant measurement and greater
responsiveness.
The adjustable cell voltage Upot is output via
the potentiostatic control loop. The cell cur-
rent (µA signal) is proportional to the concen-
tration of disinfection agent in the sample
water and is evaluated with the electronics
module.
The HOCl characteristic curve describes the
influence of the pH value on the DEPOLOX®
5 C and the influence of temperature.
Fig. 7 HOCl characteristic curve
The cell body contains the sensors and the LED
glow stick. The sensors are installed in the
location holes in the cell body cover with stan-
dardized threaded connections or in special
sensor holders. The LED glow stick is installed
in the cell body cover to visually monitor the
sensors and to signal messages and errors in
color.
On the pressurized version, the sample water
supply is connected on the output side via the
G 1/2” connection on the ball valve. At this
point, a maximum back pressure of 22 psig
(1.5 bar) is permitted.
On the non-pressurized version, the sample
water runs off via a drain connection for hoses
with an internal diameter of 6 mm directly via
the cell body outlet at the top.
The flow cell drain valve can be used to collect
a sample for calibration. It is used to draw
sample water from the cell body through the
low-pressure side of the flow control valve or
to drain the cell body for servicing purposes.
3.8 VariaSens C flow cell
The VariaSens C flow cell is available in a non-
pressurized or pressurized version. The versi-
ons also differ in the number and layout of the
sensors that can be installed and in the design
of the sample water outlet.
3.8.1 Design
Fig. 8 Cross-section, VariaSens C flow cell,
non-pressurized version
A Cover to hold the sensors and the LED glow
stick (cell body cover)
B Plastic housing with removable housing
cover
C Flow control valve
D Cell body
E
Sample water outlet (on the pressurized
version, with ball valve)
F Flow cell drain valve
G Sample water inlet with ball valve
H Fine filter
I
Check valve housing
J Multi-sensor
K Calibration holding clip
C
A
B
D
E
F
K
J
I
H
G