Continuous measurement
The electrode continuously detects the pH of the water in the tank or in the pipe.
Measurement and control
LDspH
The correct pH value ensures regulatory compliance and optimal operating conditions for all materials in contact with the water. The LDspH system measures the pH and controls the dosing pump, which injects acid or base in proportion to the measured value up to the set pH (set point).
- Range 0 – 14 pH, resolution 0.01
- Electrode in by-pass, in-line or immersion
- Electrode self-cleaning on request
- LDsPN: automatic batch neutralisation
0 – 14pHMeasuring range
0.01pHResolution
3Electrode positions
3Versions
How it works
Control principle
For wastewater, domestic water, drinking water, process water or swimming pool water: the required pH is set and the system maintains it automatically.
Insight: controlling the pH of water →
Proportional dosing
The controller activates one or more dosing pumps that inject the pH corrector (acid or base) into the tank or pipe, in proportion to the measured pH, up to the set point.
pH restoration
At each draw-off, the incoming water comes into contact with the corrector and the pump doses acid or base until the set pH is restored.
By adding a pulse-output water meter and a dosing pump connected to it, dosing also becomes proportional to the volume of water treated; the controller can also drive solenoid valves or other equipment according to the measured pH.
Acid and base
Acid and base dosing
Two different substances (generally an acid and a base) can be dosed into the same tank or pipe, or the same substance into two separate tanks or pipes.
Applications
Applications
Drinking water
Raw water from wells and springs, private and from public water supply networks.
Insight: well water →Domestic water circuits
Domestic water circuits.
Industry
Industrial process water (also with LDsPN).
Wastewater
Municipal and industrial wastewater (also with LDsPN).
2 models
Versions
LDspH
pH measurement and control with acid or base dosing. Wide flexibility in electrode positioning: in a flow-through probe holder, in-line on the pipe or immersed in the tank.
LDspH with self-cleaning
The electrode, with a flat measuring membrane kept clean by the water flow, is mounted in an immersion probe holder with nozzle: at programmed intervals the controller opens a solenoid valve that sends a jet of water or compressed air onto the electrode, removing deposits. During cleaning the pump outputs are disabled.
Compatible components
PECAPImmersion probe holder with cleaning nozzle.
Versions for every type of water
Single or double junction combination electrode, resistant to acids and bases, high temperatures and hydrofluoric acid, also suitable for low-conductivity water; available in a self-cleaning version.
pH electrodes → Jet self-cleaning
In the immersion probe holder with nozzle, a jet of water or air keeps the electrode clean in water with a high impurity load.
Probe holders →
How cleaning works
At programmed intervals the controller suspends dosing (stand-by) and opens the solenoid valve on the water or compressed air line: the jet comes out of the nozzle below the electrode tip and removes deposits. When cleaning is complete, the valve closes and, once the electrode repolarisation time has elapsed, dosing resumes.
Technical data
Probe data sheet
The controller measures pH from 0 to 14 (resolution 0.01) and temperature from 0 to 100 °C (resolution 0.1 °C), with automatic compensation; electrode self-cleaning on request, standard in the self-cleaning version.
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.
Installation
Electrode positioning
Electrode positioning is defined according to the characteristics of the installation and of the water to be analysed.
In by-pass
The probes are housed in a PEF flow-through probe holder or an NPED probe holder, connected to a water tapping point at the tank outlet and fed with about 30 l/h of sample water. A flow sensor can be added, which stops dosing when there is no flow.
Probe holders →
Immersion
The electrode is immersed directly in the storage tank of the water to be treated, by means of an immersion probe holder.
Probe holders → Immersion with cleaning
A solution suited to heavily loaded water: at programmed intervals the control panel puts the controller in stand-by and opens a solenoid valve that sends water or air to the nozzle; once cleaning is complete, it closes the valve and, after the electrode repolarisation time has elapsed, resumes dosing.
Probe holders →
In-line
The electrodes are inserted directly into the pipe carrying the water to be treated.
Probe holders →
Controller
The controller
It acquires the measurement from the probe and drives the dosing pump in proportion to the value detected. It is supplied pre-assembled on a panel, ready for connection.
Colour display
Multicolour backlit display that indicates the different operating states by changing colour. Programming via a single knob.
Four modes
Proportional, ON/OFF, PWM and PID dosing, with delayed dosing start.
Data storage
Permanent data storage and a system log viewable on the display; the internal log can be exported to a USB memory stick for processing with a spreadsheet.
Alarms
Chemical level, no flow, maximum dosing time exceeded, probe failure, out-of-range reading; acoustic or visual signalling via the alarm output.
The dosing pump, with flow rate and back-pressure defined at the time of ordering, is connected to the pulse output (and/or 0-4/20 mA) and operates in proportional or ON/OFF mode. A pre-calibrated injection valve and a magnetic level probe with coaxial foot filter, which stops the pump when the chemical runs out, are supplied as standard.
Colour display
Colour-coded status indication
By changing colour, the controller’s backlit display indicates the different operating states, which can be recognised even from a distance.
Normal operation
Measurement and dosing according to the set parameters.
Stand-by
Controller in stand-by.
Warning
Warning signal, for example the chemical level.
Alarm
Alarm signal, for example from the probe.
Settings from the display
Data sheet
Controller data sheet
Inputs, outputs, control modes and alarms of the controller.
Inputs
- Measuring probe
- Temperature
- Flow sensor
- Chemical level
- Pulse-output water meter or mA signal
Outputs
- 1 proportional dosing pump
- 1 digital output
- 2 proportional 0-4/20 mA outputs
Control
- Proportional
- ON/OFF
- PWM
- PID
- Delayed start
Alarms
- Chemical level
- No flow
- Maximum dosing time
- Probe failure
- Out-of-range reading
Power supply
- 230 VAC
- 12 – 24 VDC
LDsPN
LDsPN batch neutralisation
Fully programmable automatic system for the pH neutralisation of process water and wastewater in a tank: it manages the inlet and drain valves, the mixer and the acid and base dosing pumps. The cycle phases are repeated at each activation signal. Two modes: neutralisation to the set pH, or alkaline precipitation (for example of heavy metals) at a settable pH, with reaction time, followed by neutralisation.
Level
Control of the water level in the tank.
Filling
Opening of the inlet valve and closing when the set level is reached.
Analysis
pH measurement by means of the electrode.
Dosing
Dosing of acid or base for neutralisation, with dosing pump and mixers running.
Reaction
Waiting for the set reaction time.
Draining
Opening of the drain valve and emptying of the tank.
New cycle
Repetition of the cycle at each activation signal.
LDsPN
LDsPN display
The display shows the cycle phases and is used to set set points and times.
Main screen
Measured pH, automatic mode with cycle start at the programmed time, temperature, status of the inlet valve (EVF) and of the mixer.
Set point
Neutralisation: Value 1 pH and neutralisation pH coincide. Alkaline precipitation: base is dosed up to Value 1 pH, then acid up to the neutralisation pH.
Timer
Reaction times (Timer 1 and 2) and filling and draining control times (EVF, EVB): if the level does not switch within the set time, the alarm is triggered. From 0 to 999 minutes.
Data sheet
LDsPN controller data sheet
Inputs, outputs, control modes and alarms of the neutralisation controller.
Inputs
- pH electrode
- Temperature (Pt100)
- Tank maximum level
- Tank minimum level
- Acid level
- Base level
- Stand-by (external start and stop)
- External cycle start
Outputs
- Acid dosing pump (0 – 180 pulses/min)
- Base dosing pump (0 – 180 pulses/min)
- Inlet valve
- Drain valve
- Mixer
- Alarm
- 2 × 0/4-20 mA outputs (pH and temperature)
- RS485
Control
- Neutralisation to the set pH
- Alkaline precipitation and neutralisation
- Reaction times 0 – 999 min
- Automatic start (level or time)
- Manual start
- Tank emptying
Alarms
- Acid level
- Base level
- Maximum filling time
- Maximum draining time
General data
- 85 – 264 VAC 50/60 Hz, 24 VAC or 12 VDC
- Approx. 32 W
- 3 A relays
- IP65
- Memory of approx. 1,600 records
- 0 – 45 °C
- 213 × 200 × 124 mm
- Approx. 1.5 kg
Remote control
System remote control
The controllers can be remotely controlled bidirectionally (read and write) from the web portal, from PC, tablet and smartphone: viewing of measurements, modification of set points, dosing and alarms, receipt of alarms and download of logs. Alternatively, integration into your PLC via Modbus is possible.
Ethernet Optional, one of these
Connection to the web portal via network cable: measurements, set points, dosing and alarms accessible from PC, tablet and smartphone.
Wi-Fi Optional, one of these
Wireless connection to the web portal, with the same functions as the cable connection.
4G Optional, one of these
Connection via the cellular network for installations without a local network, with alarm notification by SMS or e-mail.
Modbus RTU Standard (standard models), optional (PLUS)
Integration into your PLC via serial port.
0-4/20 mA output Standard (PLUS), optional (standard models)
Current signal proportional to the measured value, for remote monitoring or for controlling pumps and other instrumentation.
One communication type at a time: Ethernet, Wi-Fi, 4G or Modbus RTU (built into the standard versions, optional on the PLUS versions). 4/20 mA outputs and meter input standard on the PLUS versions, optional on the standard versions.
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.
Optional extras
Optional accessories
Accessories available on request to adapt the system to the requirements of the installation.
Tank
PE tanks for the chemical, with safety bund.
Details →
Pulse-output water meter
Enables dosing proportional to the volume of water actually treated.
Details →
Flow sensor
Installed on the pump delivery line, it verifies that dosing actually takes place.
Details →
Static mixer
Ensures the chemical is mixed with the water and protects the pipe from direct contact.
Details →
Pulsation dampener
Attenuates the pulsations generated by the dosing pump.
Details →
Injection lance
Injects the chemical into the centre of the pipe.
Details →
Multifunction valve
Pressure, safety and anti-siphon functions combined in a single valve.
Details →
Solenoid valve
Operated by the controller according to the measured value.
Which one to choose
From the simplest to the most complete solution
For pH control the basic solution is the dosing station; when dosing has to be controlled by the measured value, 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 → LDspH – pH
pH measurement and dosing of acid or alkali up to the set value.
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 type of water, the volumes to be treated and the pH corrector used: we will propose the most suitable electrode, probe holder, pump and accessories.