1
Filtration
The water is drawn in through the skimmer and sent by the filtration pump to the filter, which retains the suspended impurities.
Swimming pools
Private swimming pools
The controller measures the pH and the disinfectant and automatically doses pH corrector and disinfectant. Up to 150 m³ the WD systems are used, with the two pumps integrated in the controller; above 150 m³ the LD controllers become the most suitable, with the option of using dosing pumps sized for the pool volume. The preferred solution measures free chlorine with a closed (membrane) amperometric cell; alternatively, Redox, bromine or hydrogen peroxide (active oxygen) systems can be used.
- Up to 150 m³: WD
- Above 150 m³: LD
- Free chlorine, Redox, bromine or peroxide
- Priority to pH control
150m³Threshold between WD and LD
0.01mg/lClosed cell resolution
3Maintenance levels
2Alternatives to chlorine
How it works
The treatment circuit of a swimming pool
The pool water circulates continuously between the pool and the plant room, where it is filtered, analysed and disinfected before being returned.
Insight: swimming pool water →
2
Measurement
A water sample flows through the probe holder of the panel, where pH and free chlorine are measured continuously.
3
pH control
The controller regulates pH as a priority: the pump doses the corrector until the set value is reached.
4
Chlorine dosing
With the pH at the correct values, hypochlorite is dosed, at a flow rate that is progressively reduced as the set point is approached.
5
Return to the pool
The filtered and disinfected water is returned to the pool through the return inlets.
6
Make-up
Water lost through evaporation or discharge is replaced; with the Centurio POOL the volume fed in is measured by a pulse-output water meter.
Typical layout
Typical layout
The treatment system is installed in the plant room, downstream of the filtration: the probes analyse a water sample and injection takes place on the delivery pipe to the pool.
Low maintenance · preferred solution
Free chlorine with closed cell
WDpHCl – up to 150 m³
Controller and two solenoid dosing pumps in a single unit, with probe holder, cell and sample filter pre-assembled on a panel. Also suitable for type 2 collective-use swimming pools up to 150 m³.
LDpHCl – above 150 m³
Two-channel controller with colour display and external dosing pumps, selected according to the pool volume; it also manages the salt chlorinator and flocculant dosing.
WNpHCl with closed cell
Quiet version: two stepper-motor peristaltic pumps, quiet and precise; free chlorine with the SCL closed cell.
Advantages of the closed cell
- Direct measurement: it indicates free chlorine in mg/l, without resorting to the chart that cross-references pH and mV.
- Selective membrane: the electrodes are not in contact with the water: the membrane lets through only hypochlorous acid and excludes the hypochlorite ion, combined chlorine and cyanuric acid.
- pH and temperature compensated: automatic compensation ensures that the reading reflects the mg/l of free chlorine actually present, with a resolution of 0.01 mg/l.
- Minimal calibration: water composition and conductivity do not affect the reading: it is the solution with the least maintenance.
Medium maintenance
Free chlorine with ECL6 open cell
The same systems with the ECL6 open cell, 0 – 10 mg/l range.
WDpHCl with open cell – up to 150 m³
With the two pumps integrated in the controller.
LDpHCl with open cell – above 150 m³
With external pumps sized for the pool.
WNpHCl with open cell
Quiet version: two stepper-motor peristaltic pumps, quiet and precise; free chlorine with the ECL6 open cell.
Limitations of the open cell compared with the closed cell
- Combined chlorine: combined chlorine has some influence on the free chlorine reading, reducing its precision over time; with the closed cell the reading is always precise.
- Stabiliser: cyanuric acid affects the reading; in the closed cell it is excluded by the membrane.
- pH and water: the pH, composition and conductivity of the water have an influence, albeit to a lesser extent than with Redox.
- Periodic calibration: it must be calibrated periodically, less frequently than Redox but more often than the closed cell.
High maintenance
pH and Redox
The Redox potential (0 – 1,000 mV) indicates the oxidising power of the water: it is the most economical solution. The set point is determined by bringing the pH to the optimum value, measuring free chlorine with the colorimetric kit and reading the corresponding Redox value, typically 650 mV at pH 7.5.
WDpHRh – up to 150 m³
Controller with the two integrated pumps, sample filter and in-line probe holder on the panel.
LDpHRh – above 150 m³
Two-channel controller with temperature compensation and external dosing pumps.
WNpHRh
Quiet version: two stepper-motor peristaltic pumps, quiet and precise; Redox control.
Limitations of Redox compared with amperometric cells
- Indirect measurement: it reads the mV generated by the chlorine in the water, not the free chlorine: to know the mg/l, the chart that cross-references pH and mV is required.
- Every water has its own potential: rain, make-up water, evaporation, temperature and bathers alter the reading even with the same free chlorine.
- pH-dependent: 700 mV corresponds to approximately 1.0 mg/l of free chlorine at pH 7.4 and approximately 1.6 mg/l at pH 7.6: the pH must be corrected first.
- Setting with the tester: to set up the system, hypochlorite is dosed until 1.5 mg/l of free chlorine is reached, measured with the tester, and the corresponding mV value is noted; the check must be repeated periodically.
I do not want chlorine
Alternatives to chlorine
Bromine, which is more stable at high temperatures, or hydrogen peroxide (active oxygen), which raises no issues of chlorine by-products or dechlorination of the discharge. The controllers are the same, with the closed cell dedicated to the disinfectant: WD up to 150 m³, LD above. As an alternative to liquid hypochlorite, the salt chlorinator produces chlorine directly from the salt dissolved in the pool.
Insight: swimming pool water discharges →
Bromine
Free bromine in mg/l with the SBR closed cell (0 – 20 mg/l, 0.01 mg/l resolution): WDpHCl Bromine up to 150 m³, LDpHCl for bromine above.
Hydrogen peroxide
Active oxygen measured by the SCL9 closed cell (0 – 200 mg/l, 0.1 mg/l resolution); typical set points 30 mg/l and pH 7: WDpHCl Peroxide up to 150 m³, LDpHCl for hydrogen peroxide above.
Salt
The salt chlorinator produces chlorine from the salt dissolved in the pool, with no storage or dosing of hypochlorite. The S versions (WDpHCls, WDpHRhs) up to 150 m³, and the LDpHCl above, control the control unit on the basis of the measured free chlorine or Redox.
WNpHCl Bromo
Quiet version: pH and free bromine, with two stepper-motor peristaltic pumps.
WNpHCl Perossido
Quiet version: pH and hydrogen peroxide, with two stepper-motor peristaltic pumps.
Configurator
Which system for your swimming pool
The pool volume determines the controller and the desired level of maintenance determines the disinfectant measurement; for chlorine, you then choose between liquid hypochlorite and a salt chlorinator.
Answer the questions: the recommended system appears below.
Recommended systemWDpHCl with SCL closed cell
Free chlorine measured directly in mg/l, with maximum precision and calibrations kept to a minimum.
Components
WDpHCl controller
With the two integrated dosing pumps: pH corrector and disinfectant.
The pump →
SCL closed cell
Free chlorine in mg/l, selective membrane, 0.01 mg/l resolution.
SCL cells →
pH electrode
EPHS combination electrode, 0 – 14 pH.
pH electrodes →
Probe holder and filter
Flow-through probe holder with flow sensor, 50 µm sample filter.
Probe holders →Recommended systemLDpHCl with SCL closed cell
Free chlorine measured directly in mg/l, with dosing pumps sized for the pool volume.
Components
LDpHCl controller
Two-channel controller with colour display: it controls the external pumps.
The controller →
pH corrector pump
Solenoid dosing pump, flow rate selected according to the pool volume.
V and VMS pumps →Disinfectant pump
Dosing proportional to the measured value.
V and VMS pumps →SCL closed cell
Free chlorine in mg/l, selective membrane, 0.01 mg/l resolution.
SCL cells →pH electrode
EPHS combination electrode, 0 – 14 pH.
pH electrodes →Probe holder and filter
Flow-through probe holder with flow sensor, 50 µm sample filter.
Probe holders →Recommended systemWDpHCl with ECL6 open cell
Free chlorine in mg/l with the open cell: the measurement requires periodic calibration.
Components
WDpHCl controller
With the two integrated dosing pumps: pH corrector and disinfectant.
The pump →
ECL6 open cell
Free chlorine 0 – 10 mg/l, periodic calibration.
ECL6 cell →pH electrode
EPHS combination electrode, 0 – 14 pH.
pH electrodes →Probe holder and filter
Flow-through probe holder with flow sensor, 50 µm sample filter.
Probe holders →Recommended systemLDpHCl with ECL6 open cell
Free chlorine in mg/l with the open cell and pumps sized for the pool; the measurement requires periodic calibration.
Components
LDpHCl controller
Two-channel controller with colour display: it controls the external pumps.
The controller →pH corrector pump
Solenoid dosing pump, flow rate selected according to the pool volume.
V and VMS pumps →Disinfectant pump
Dosing proportional to the measured value.
V and VMS pumps →ECL6 open cell
Free chlorine 0 – 10 mg/l, periodic calibration.
ECL6 cell →pH electrode
EPHS combination electrode, 0 – 14 pH.
pH electrodes →Probe holder and filter
Flow-through probe holder with flow sensor, 50 µm sample filter.
Probe holders →Recommended systemWDpHRh
The most economical solution: the Redox reading must be checked periodically with the chlorine test.
Components
WDpHRh controller
With the two integrated dosing pumps: pH corrector and disinfectant.
The pump →pH electrode
EPHS combination electrode, 0 – 14 pH.
pH electrodes →
Redox electrode
Single-junction combination electrode, 0 – 1,000 mV.
Redox electrodes →
Filter and probe holder
In-line on the panel: the sample is filtered and flows through the probe holder.
Probe holders →Recommended systemLDpHRh
Redox control with pumps sized for the pool; the reading must be checked periodically with the chlorine test.
Components
LDpHRh controller
Two-channel controller with colour display: it controls the external pumps.
The controller →pH corrector pump
Solenoid dosing pump, flow rate selected according to the pool volume.
V and VMS pumps →Disinfectant pump
Dosing proportional to the measured value.
V and VMS pumps →pH electrode
EPHS combination electrode, 0 – 14 pH.
pH electrodes →Redox electrode
Single-junction combination electrode, 0 – 1,000 mV.
Redox electrodes →Filter and probe holder
In-line on the panel: the sample is filtered and flows through the probe holder.
Probe holders →Recommended systemWDpHCls with SCL closed cell
Free chlorine measured with the closed cell: the controller activates the salt chlorinator according to the measured value and corrects the pH first.
Components
WDpHCls controller
Integrated pH corrector pump and 230 VAC 10 A Schuko socket for the salt chlorinator control unit.
The pump →SCL closed cell
Free chlorine in mg/l, selective membrane, 0.01 mg/l resolution.
SCL cells →pH electrode
EPHS combination electrode, 0 – 14 pH.
pH electrodes →Probe holder and filter
Flow-through probe holder with flow sensor, 50 µm sample filter.
Probe holders →Recommended systemWDpHCls with ECL6 open cell
Free chlorine measured with the open cell, which requires periodic calibration: the controller activates the salt chlorinator according to the measured value.
Components
WDpHCls controller
Integrated pH corrector pump and 230 VAC 10 A Schuko socket for the salt chlorinator control unit.
The pump →ECL6 open cell
Free chlorine 0 – 10 mg/l, periodic calibration.
ECL6 cell →pH electrode
EPHS combination electrode, 0 – 14 pH.
pH electrodes →Probe holder and filter
Flow-through probe holder with flow sensor, 50 µm sample filter.
Probe holders →
Recommended systemWDpHRhs
Redox control: the controller activates the salt chlorinator according to the measured mV; the reading must be checked periodically with the chlorine test.
Components
WDpHRhs controller
Integrated pH corrector pump and 230 VAC 10 A Schuko socket for the salt chlorinator control unit.
The pump →pH electrode
EPHS combination electrode, 0 – 14 pH.
pH electrodes →Redox electrode
Single-junction combination electrode, 0 – 1,000 mV.
Redox electrodes →Filter and probe holder
In-line on the panel: the sample is filtered and flows through the probe holder.
Probe holders →Recommended systemLDpHCl with SCL closed cell
The controller measures free chlorine with the closed cell and controls the salt chlorinator control unit; the pump doses the pH corrector only.
Components
LDpHCl controller
Two-channel controller: it controls the pH pump and the salt chlorinator control unit.
The controller →pH corrector pump
Solenoid dosing pump, flow rate selected according to the pool volume.
V and VMS pumps →SCL closed cell
Free chlorine in mg/l, selective membrane, 0.01 mg/l resolution.
SCL cells →pH electrode
EPHS combination electrode, 0 – 14 pH.
pH electrodes →Probe holder and filter
Flow-through probe holder with flow sensor, 50 µm sample filter.
Probe holders →Recommended systemLDpHCl with ECL6 open cell
The controller measures free chlorine with the open cell and controls the salt chlorinator control unit; the pump doses the pH corrector only.
Components
LDpHCl controller
Two-channel controller: it controls the pH pump and the salt chlorinator control unit.
The controller →pH corrector pump
Solenoid dosing pump, flow rate selected according to the pool volume.
V and VMS pumps →ECL6 open cell
Free chlorine 0 – 10 mg/l, periodic calibration.
ECL6 cell →pH electrode
EPHS combination electrode, 0 – 14 pH.
pH electrodes →Probe holder and filter
Flow-through probe holder with flow sensor, 50 µm sample filter.
Probe holders →Recommended systemLDpHRh
The controller measures Redox and controls the salt chlorinator control unit; the pump doses the pH corrector only.
Components
LDpHRh controller
Two-channel controller: it controls the pH pump and the salt chlorinator control unit.
The controller →pH corrector pump
Solenoid dosing pump, flow rate selected according to the pool volume.
V and VMS pumps →pH electrode
EPHS combination electrode, 0 – 14 pH.
pH electrodes →Redox electrode
Single-junction combination electrode, 0 – 1,000 mV.
Redox electrodes →Filter and probe holder
In-line on the panel: the sample is filtered and flows through the probe holder.
Probe holders →Recommended systemWDpHCl Bromine
Free bromine measured in mg/l with the dedicated closed cell, on the same panel as the WDpHCl.
Components
WDpHCl Bromine controller
With the two integrated dosing pumps: pH corrector and disinfectant.
The pump →SBR closed cell
Free bromine 0 – 20 mg/l, 0.01 mg/l resolution.
SBR cell →pH electrode
EPHS combination electrode, 0 – 14 pH.
pH electrodes →Probe holder and filter
Flow-through probe holder with flow sensor, 50 µm sample filter.
Probe holders →Recommended systemLDpHCl for bromine
Free bromine measured in mg/l with the dedicated closed cell and pumps sized for the pool.
Components
LDpHCl for bromine controller
Two-channel controller with colour display: it controls the external pumps.
The controller →pH corrector pump
Solenoid dosing pump, flow rate selected according to the pool volume.
V and VMS pumps →Disinfectant pump
Dosing proportional to the measured value.
V and VMS pumps →SBR closed cell
Free bromine 0 – 20 mg/l, 0.01 mg/l resolution.
SBR cell →pH electrode
EPHS combination electrode, 0 – 14 pH.
pH electrodes →Probe holder and filter
Flow-through probe holder with flow sensor, 50 µm sample filter.
Probe holders →Recommended systemWDpHCl Peroxide
Hydrogen peroxide (active oxygen) measured with the SCL9 closed cell; typical set points 30 mg/l and pH 7.
Components
WDpHCl Peroxide controller
With the two integrated dosing pumps: pH corrector and disinfectant.
The pump →
SCL9 closed cell
Hydrogen peroxide 0 – 200 mg/l, 0.1 mg/l resolution.
SCL9 cell →pH electrode
EPHS combination electrode, 0 – 14 pH.
pH electrodes →Probe holder and filter
Flow-through probe holder with flow sensor, 50 µm sample filter.
Probe holders →Recommended systemLDpHCl for hydrogen peroxide
Hydrogen peroxide (active oxygen) with the SCL9 closed cell and pumps sized for the pool; typical set points 30 mg/l and pH 7.
Components
LDpHCl for hydrogen peroxide controller
Two-channel controller with colour display: it controls the external pumps.
The controller →pH corrector pump
Solenoid dosing pump, flow rate selected according to the pool volume.
V and VMS pumps →Disinfectant pump
Dosing proportional to the measured value.
V and VMS pumps →SCL9 closed cell
Hydrogen peroxide 0 – 200 mg/l, 0.1 mg/l resolution.
SCL9 cell →pH electrode
EPHS combination electrode, 0 – 14 pH.
pH electrodes →Probe holder and filter
Flow-through probe holder with flow sensor, 50 µm sample filter.
Probe holders →
pH and chlorine
The role of pH in disinfection
Chlorine added to water, whether as hypochlorite or trichlor, splits into hypochlorous acid and hypochlorite ion; the ratio between the two forms depends on the pH.
Hypochlorous acid
This is the form with the highest and fastest disinfecting power. Its share increases with a pH close to 7 (7.2 – 7.4) and stable: for the same quantity of chlorine dosed, disinfection is more effective.
Hypochlorite ion
Its disinfecting power is considerably lower and it prevails as the pH tends towards 8. For this reason the systems regulate pH as a priority and only then the chlorine dosing.
Combined chlorine
Chlorine that reacts with the nitrogenous substances introduced by bathers forms chloramines, which are responsible for eye and mucous membrane irritation and for the characteristic odour. The value must not exceed 0.4 mg/l; the sum of free and combined chlorine is the total chlorine.
The use of liquid sodium hypochlorite is recommended, dosed by a pump controlled by the free chlorine and pH measurement.
Salt
Salt chlorinator management
The salt chlorinator produces chlorine from the salt dissolved in the pool. The S models (WDpHCls, WDpHRhs) manage it directly: instead of the hypochlorite pump they have a 230 VAC 10 A Schuko socket, to which the control unit is connected; it is activated according to the measured value.
ON/OFF
Example with Redox measurement: the control unit is active below 600 mV, stops at 700 mV and restarts when the value next falls below 600 mV.
Proportional
Below 600 mV the control unit runs continuously and at 700 mV it stops; in the intermediate range the controller modulates its activation frequency and duration.
pH priority
The corrector pump acts first (for example at maximum frequency at pH 8.00 and stopped at 7.00); disinfectant control follows once the set pH has been reached.
Installation
Installation
Pre-assembled
All systems are supplied pre-assembled on a plastic panel, in a watertight box or on a skid, with solenoid or peristaltic dosing pumps.
In the plant room
Injection takes place on the delivery line, downstream of the filtration, by means of an injection valve or lance; the probes analyse a water sample in the flow-through probe holder.
Probe holders →Connection to the filtration
The controller must always remain powered, to maintain the polarisation of the electrodes; when the filtration pump stops it goes into stand-by, continuing to measure without dosing.
Technical data
Technical data
Redox, open cell and closed cell compared
| Redox | Open cell | Closed cell | |
|---|---|---|---|
| Reading | mV (chlorine estimate) | mg/l of free chlorine | mg/l of free chlorine |
| Range | 0 – 1,000 mV | 0 – 10 mg/l | 0 – 20 mg/l |
| Water composition and conductivity | Affect the reading | Affect it to a lesser extent | No effect |
| pH | Significant effect | Reduced effect | Compensated |
| Temperature | Can be compensated | Compensated | Compensated |
| Combined chlorine and hypochlorite ion | Affect the reading | Affect the reading | Excluded by the membrane |
| Stabiliser (cyanuric acid) | Affects the reading | Affects the reading | Excluded by the membrane |
| Calibration | Frequent, with colorimetric test | Periodic | Kept to a minimum |
In public swimming pools and pools for collective use, UNI 10637:2024 (Italian standard) does not allow chlorine to be derived from the Redox potential, which is accepted only as a supplementary indication: measuring instruments required by the standard.
Probe data sheets
pH electrodes
| Electrode | Pressure | Connection | Body | Minimum conductivity | Junction | Temperature | Cable | Diameter | Notes |
|---|---|---|---|---|---|---|---|---|---|
| EPHS | 7 bar (3.5 bar) | BNC | Epoxy | 100 µS | – | 70 °C (80 °C) | 0.8 m | 12 mm | – |
| EPHM | 7 bar (3.5 bar) | BNC | Epoxy | 100 µS | – | 70 °C (80 °C) | 4.5 m | 12 mm | – |
| EPHL | 7 bar (3.5 bar) | BNC | Epoxy | 100 µS | – | 70 °C (80 °C) | 15 m | 12 mm | – |
| EPHSN6 | 7 bar (3.5 bar) | SN6 with PG13.5 thread | Epoxy | 100 µS | – | 70 °C (80 °C) | 1 – 100 m | 12 mm | – |
| EPHMD/100 | 7 bar | BNC | Epoxy | 100 µS | Double | 100 °C | 4.5 m | 12 mm | – |
| EPHM/D | 7 bar (3.5 bar) | BNC | Epoxy | 100 µS | Double | 70 °C (80 °C) | 4.5 m | 12 mm | – |
| EPHM/D/SN6 | 7 bar (3.5 bar) | SN6 with PG13.5 thread | Epoxy | 100 µS | Double | 70 °C (80 °C) | 1 – 100 m | 12 mm | – |
| EPHMD/LI | 7 bar (3.5 bar) | SN6 with PG13.5 thread | Epoxy | 3 µS | Double | 70 °C (80 °C) | 1 – 100 m | 12 mm | For low-conductivity water |
| EPHSC | 7 bar (3.5 bar) | BNC | Epoxy | 100 µS | Double | 70 °C (80 °C) | 4.5 m | 12 mm | Self-cleaning |
| EPHSC/SN6 | 7 bar (3.5 bar) | SN6 with PG13.5 thread | Epoxy | 100 µS | Double | 70 °C (80 °C) | 1 – 100 m | 12 mm | Self-cleaning |
| EPHM/HF | 7 bar (3.5 bar) | BNC | Epoxy | 100 µS | Double | 70 °C (80 °C) | 4.5 m | 12 mm | Resistant to 1% hydrofluoric acid |
| EPHSN6 GK | 10 bar | SN6 | Glass | 150 µS | – | −5 / 135 °C | 1 – 100 m | 12 mm | High temperature |
All models: combination electrode, range 0 – 14 pH, resolution 0.01.
Redox electrodes
| Electrode | Range | Pressure | Connection | Body | Minimum conductivity | Junction | Temperature | Cable | Diameter | Notes |
|---|---|---|---|---|---|---|---|---|---|---|
| ERhS | ± 1,000 mV | 7 bar (3.5 bar) | BNC | Epoxy | 100 µS | – | 70 °C (80 °C) | 0.8 m | 12 mm | – |
| ERhM | ± 1,000 mV | 7 bar (3.5 bar) | BNC | Epoxy | 100 µS | – | 70 °C (80 °C) | 4.5 m | 12 mm | – |
| ERhL | ± 1,000 mV | 7 bar (3.5 bar) | BNC | Epoxy | 100 µS | – | 70 °C (80 °C) | 15 m | 12 mm | – |
| ERhHLB SN6 | ± 1,500 mV | 6 bar | SN6 with PG13.5 thread | Glass | 100 µS | – | 80 °C | 10 m | 12 mm | High linearity and sensitivity, for low chlorine concentrations |
| ERhSN6 | ± 1,000 mV | 7 bar | SN6 with PG13.5 thread | Epoxy | 100 µS | – | 100 °C | 1 – 100 m | 12 mm | – |
| ERhMD/100 | ± 1,000 mV | 7 bar | BNC | Epoxy | 100 µS | Double | 100 °C | 4.5 m | 12 mm | – |
| ERhM/D | ± 1,000 mV | 7 bar (3.5 bar) | BNC | Epoxy | 100 µS | Double | 70 °C (80 °C) | 4.5 m | 12 mm | – |
| ERhSC | ± 1,000 mV | 7 bar (3.5 bar) | BNC | Epoxy | 100 µS | Double | 70 °C (80 °C) | 4.5 m | 12 mm | Self-cleaning |
| ERhSC/SN6 | ± 1,000 mV | 7 bar (3.5 bar) | SN6 with PG13.5 thread | Epoxy | 100 µS | Double | 70 °C (80 °C) | 1 – 100 m | 12 mm | Self-cleaning |
All models: combination electrode, resolution 1 mV.
Closed (membrane) amperometric cells – Free chlorine
| SCL3N/0.5 | SCL3N/2 | SCL3N/20 | SCL18/0.5 | SCL18/2 | SCL18/20 | SCL3S/20 | |
|---|---|---|---|---|---|---|---|
| Measuring range | 0 – 0.5 mg/l | 0 – 2 mg/l | 0 – 20 mg/l | 0 – 0.5 mg/l | 0 – 2 mg/l | 0 – 20 mg/l | 0 – 20 mg/l |
| Resolution | 0.001 | 0.001 | 0.01 | 0.001 | 0.001 | 0.01 | 0.01 |
| Free chlorine | Inorganic | Inorganic | Inorganic | Inorganic | Inorganic | Inorganic | Organic and inorganic |
| Water | Fresh | Fresh | Fresh | Fresh | Fresh | Fresh | Fresh or salt |
| Electrodes | 2 | 2 | 2 | 3 | 3 | 3 | 2 |
| Selective membrane | Yes | Yes | Yes | No | No | No | Yes |
| Automatic compensation | pH and temperature | pH and temperature | pH and temperature | pH and temperature | pH and temperature | pH and temperature | Temperature |
| Self-cleaning | – | – | – | Yes | Yes | Yes | – |
| Operating pH | 5 – 9.5 | 5 – 9.5 | 5 – 9.5 | 5 – 9 | 5 – 9 | 5 – 9 | 5.5 – 9.5 |
| Operating temperature | 1 – 40 °C | 1 – 40 °C | 1 – 40 °C | 5 – 70 °C | 5 – 70 °C | 5 – 70 °C | 5 – 45 °C |
| Operating pressure | 1 bar | 1 bar | 1 bar | 8 bar | 8 bar | 8 bar | 1 bar |
| Water flow | 30 l/h | 30 l/h | 30 l/h | 40 l/h | 40 l/h | 40 l/h | 30 l/h |
Closed (membrane) amperometric cells – Other oxidants
| SCL8/2 | SCL8/20 | SBR/20 | SCL9 | SCL11/200 | SCL11/2000 | SCL10 | SCT | |
|---|---|---|---|---|---|---|---|---|
| Measurement | Total chlorine | Total chlorine | Bromine | Hydrogen peroxide | Peracetic acid | Peracetic acid | Ozone | Chlorites |
| Measuring range | 0 – 2 mg/l | 0 – 20 mg/l | 0 – 20 mg/l | 0 – 200 mg/l | 0 – 200 mg/l | 0 – 2,000 mg/l | 0 – 20 mg/l | 0 – 2 mg/l |
| Resolution | 0.001 | 0.01 | 0.01 | 0.1 | 0.1 | 1 | 0.01 | 0.001 |
| Operating pH | 4 – 12 | 4 – 12 | 6.5 – 9.5 | 1 – 11 | 1 – 6 | 1 – 6 | 2 – 11 | 5.5 – 9.5 |
| Operating pressure | 1 bar | 1 bar | 0.5 bar | 1 bar | 1 bar | 1 bar | 1 bar | 1 bar |
All models: 2 electrodes, selective membrane, automatic temperature compensation, operating temperature 1 – 40 °C, water flow 30 l/h.
ECL open cells
| ECL6 | ECL6/E | ECL7 | ECL12 | ECL12/E | ECL20 | ECL21 | |
|---|---|---|---|---|---|---|---|
| Water | Fresh | Fresh | Fresh | Sea | Sea | Fresh | Sea |
| Flow stabiliser | Yes | Yes | Yes | Yes | Yes | – | – |
| Flow sensor and regulation | Yes | Yes | Yes | Yes | Yes | – | – |
| Probe holder for | Temperature, pH, Redox | Temperature | Temperature, pH, Redox (PG13.5) | Temperature, pH, Redox | Temperature | – | – |
All models: amperometric system, range 0 – 10 mg/l, resolution 0.01, organic and inorganic free chlorine, operating temperature 1 – 40 °C, pressure 0.4 – 5 bar, water flow 40 l/h.
Remote control
Remote control
The controllers can be remotely monitored and controlled via Wi-Fi, Ethernet or 4G from the web portal, free of charge and with no subscription: set points, dosing, alarms and logged data are accessible from PC, tablet and smartphone.
Wi-Fi
Wireless connection to the web portal, with the same functions as the cable connection.
Ethernet
Connection to the web portal via network cable: measurements, set points, dosing and alarms accessible from PC, tablet and smartphone.
4G
Connection via the cellular network for installations without a local network, with alarm notification by SMS or e-mail.
Modbus RTU
Integration into your PLC via serial port.
The NIMBUS portal
A single account brings together all registered installations, each with its own devices: the web portal, free of charge and with no subscription, can be accessed from PC, Mac, tablet and smartphone and allows every parameter to be both viewed and changed, with an encrypted connection and protected access.
Overview
On a single screen: probe readings, chemical levels, pump activation thresholds and active alarms, with the status of installations and devices (normal, warning, alarm, standby, not connected).
Installation map
Installations appear on an interactive map with their status and open with a click; for each one, the local weather conditions and temperature are also shown.
History and charts
Archive of measurements and alarms, available for consultation at any time with charts and numerical reports exportable in Excel format.
Alarms and notifications
Alarm thresholds for readings, dosing, faulty probe and out-of-range readings, with notification by e-mail or SMS depending on the communication system; a warning is also issued when an installation remains disconnected beyond the set time.
Set points and dosing
Remote modification of the set points, of the dosing pump activation thresholds and of the corresponding hourly flow rate.
Inputs and outputs
Status of relays, pulse outputs, digital inputs and current outputs, with the name assigned to each connection.
Maintenance calendar
Tasks are scheduled by installation or by device and assigned to technicians; a reminder is sent by e-mail two days before the due date. Each task is shown as scheduled, due, overdue or completed.
Team and permissions
The main account has full access and creates the technicians’ accounts, each enabled only for the assigned installations and devices; the last login and activity of each technician are visible.
Reports and activity log
Reports on devices, tasks and technicians, downloadable in PDF or CSV with the customer’s logo; the log keeps the history of operations and disconnections.
Customisation
Logo, main colour and light or dark theme; the tiles on the main screen can be rearranged by dragging them. Two installations can be displayed side by side for comparison.
Guided registration
Each device is added through a guided procedure: the model is recognised automatically and associated with the installation, together with the technician to be contacted.
PLC integration
As an alternative to the portal, the Modbus RTU or TCP/IP port allows integration into the plant supervision system.
Installations
Installation examples
Systems are supplied pre-assembled and tested, in the form best suited to the plant room: on a panel, in a cabinet or on a skid (with cover, in a box or on a frame), also tailor-made. Some examples.
On a panel
Controller, pumps, probe holder and accessories mounted and wired on a wall panel.
In a cabinet
System panel and chemical tanks housed in a single cabinet.
Wall cabinet
Pipework, pumps and electrical panel in a wall cabinet with door.
Skid with cover
Skid with raised stainless steel frame and protective PMMA cover.
Skid in a box
Skid enclosed in a box with door, with the chemical tanks at the base.
Skid on a frame
Skid on a frame with doors, pre-assembled and ready for connection.
On the tank
Dosing pump mounted directly on the tank: the most compact solution.
In the plant room
Wall installation in the plant room, with the chemical tanks on the floor.
Pumps, controllers or components supplied by the customer can also be fitted, with custom dimensions, back panel and electrical panel. Dosing stations and skids →
Which one to choose
From the simplest to the most complete solution
For chlorine and other disinfectants the basic solution is the dosing station; to dose according to the concentration actually present in the water, measuring controllers are used.
Dosing station
The simplest solution: the pump doses at a constant rate or in proportion to the volume of water measured by the pulse-output water meter.
Details →
LDsRh
Dosing based on the Redox potential of the water: an economical solution, based on an indirect measurement.
Details →
LDsCL
The amperometric cell directly measures the disinfectant concentration in mg/l, ensuring maximum dosing accuracy.
Details →
LD Dual Parameter
Simultaneous management of two parameters, for example pH and chlorine, with a single controller.
Details → Centurio PRO
Management of up to 10 parameters and of all the pumps in the installation, with touch screen and remote control as standard.
Details →Technical consultancy
Tell us the pool volume and the disinfectant you prefer: we will propose the most suitable system and accessories.