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3. Description
DEPOLOX® Pool E flow cell
EN
3.5.2 Function
The sample water is connected on the input
side to the shut-off ball valve via the G1/2"
connection. The input pressure must be
around 0.25 to 3.0 bar. To guarantee a cons-
tant flow, the minimum input pressure must
not be less than 0.25 bar. Otherwise, an opti-
onal booster pump must be used. If the admis-
sion pressure exceeds 3.0 bar, an optional
pressure reducing valve must be used.
The sample water flows over the optional
strainer, which prevents dirt particles pene-
trating into the flow cell.
The sample water flows in the flow direction
to the check valve housing through the filter
unit or through the built-in fine filter (memb-
rane sensors only). The check valve housing
provides a non-return function and guides the
ball for monitoring the flow rate. In the filter
unit a stainless steel fine filter (sample water
fine filter) with a mesh size w=500 ìm can be
installed. The fine filter is only used in con-
junction with the membrane sensors.
The multi-sensor monitors the correct flow by
the float principle with reed switch and mea-
sures the temperature with the Pt1000. The
large-surface transducer grounding is through
the stainless steel sensor housing.
The flow control valve ensures a flow of the
sample water that is not dependent on the
operating pressure. The correct sample water
flow of 33 l/h is factory-preset, checked and
logged. If the admission pressure rises, the
valve ball moves towards the closing direc-
tion; if the admission pressure drops, the ball
moves towards the opening direction.
The sensors are installed in the mounting hole
of the cell body cover with standard thread
connections or in special sensor mounts.
The LED glow stick is fitted in the cell body
cover for visual inspection of the sensors and
for color indication of messages or faults.
The flow distributor cap screwed into the cell
body from the bottom enables the continuous
hydromechanical cleaning of the electrode of
the chlorine sensor using special cleaning sand
and thereby effectively prevents the natural
contamination of the electrode surfaces.
Clean electrode surfaces and a constant flow
of sample water are decisive criteria for a qua-
litative good chlorine measurement and quick
responsiveness.
The sample water runs off directly through the
top cell body outlet through an outlet nozzle
for hoses with inner diameter 6 mm. In the
case of the pressurized version, the sample
water runs off through a shut-off ball valve
with G 1/2" A-connection. With the pressuri-
zed version, a maximum back pressure of 1.5
bar is permitted here.
A sample extraction unit is used to draw sam-
ple from the cell body through the low-pres-
sure side of the flow control valve and to drain
the cell body for servicing.
3.6
DFMe electronics module
DFMe electronics module consists of a spray-
water tight housing with built-in sensor elec-
tronics and is integrated in the main housing
of the flow cell. The sensor cables are prefabri-
cated and are splash-proof to IP66. The
motherboard holds the sensor input for the
chlorine sensor, the LED glow stick and the
evaluation electronics for the multi-sensor.
Optionally, the motherboard contains two
additional slots for the pH and ORP (Redox)
single-rod measuring chain. To the integrated
CAN socket the CAN connection cable to 700 P
electronics module is connected. Further opti-
onal sensors, such as for total chlorine and/or
conductivity module SiDiSens can be connec-
ted through a second CAN connection socket
(optional). See design chapter 4.13 - Fig. 8.
