Velon MF
For constant dosing or dosing proportional to 4/20 mA or 0-10 V signals or to a pulse-output water meter.
- Constant (litres/hour)
- External constant
- PPM
- Percentage
- Millilitres per quintal
- Volt
- Pause / work
- cc / pulse
- Pulses
- Batch
- mA
- Timer
Peristaltic dosing pumps
Velon Series
Stepper motor peristaltic dosing pumps, for high-precision dosing at low and medium flow rates. The electronically controlled motor makes dosing continuous and free of pulsations, in civil, sanitary and industrial applications.
- Up to 12 l/h
- Continuous dosing, without pulsations
- Also suitable for products that release gas
- Wall mounting, or floor mounting with bracket
12l/hMaximum flow rate
2barMaximum pressure
1–100RPMRotor speed
4Models
4 models
Model selection
From the constant dosing model to the multifunction model, up to the versions with integrated pH meter and Redox meter or controlled via Modbus.
Velon PO
With integrated pH meter and Redox meter for automatic control of pH or Redox (ORP).
- Proportional to pH
- Proportional to Redox
- Automatic pH dosing
- Automatic Redox dosing
Compatible components
EpHSpH electrode
ERhSRedox (ORP) electrode
Velon PM
For dosing controlled via Modbus RTU.
- Modbus with level control
Velon CL
For constant dosing, with input for tank level control.
- Constant
Selection guide
Which model to choose
State how the pump must dose, the product, the flow rate and the back pressure: the guide proposes the most suitable model and configuration of the series, among those listed in the technical data.
Answer the questions and enter flow rate and back pressure: the recommended model appears below.
Overview
Model comparison
| Function | MF | PO | PM | CL |
|---|---|---|---|---|
| Dosing modes | ||||
| Constant | – | – | – | ● |
| Constant (litres/hour) | ● | – | – | – |
| External constant | ● | – | – | – |
| Modbus with level control | – | – | ● | – |
| Pause / work | ● | – | – | – |
| cc / pulse | ● | – | – | – |
| Pulses | ● | – | – | – |
| PPM | ● | – | – | – |
| Millilitres per quintal | ● | – | – | – |
| Percentage | ● | – | – | – |
| Batch | ● | – | – | – |
| mA | ● | – | – | – |
| Volt | ● | – | – | – |
| Proportional to pH | – | ● | – | – |
| Proportional to Redox | – | ● | – | – |
| Automatic pH dosing | – | ● | – | – |
| Automatic Redox dosing | – | ● | – | – |
| Timer | ● | – | – | – |
| Functions | ||||
| Electronic flow rate adjustment | ● | ● | ● | ● |
| Digital display | ● | ● | – | – |
| Level control | ● | ● | ● | ● |
| Stand-by | ● | ● | – | – |
| Alarm output (optional) | ● | ● | – | ● |
Operation
Dosing modes
Constant
The pump doses at a constant injection frequency, proportional to the flow rate percentage set with the analogue selector (0 – 100%).
Models: Velon CL
Constant (litres/hour)
The pump doses at a constant frequency, according to the flow rate set in litres/hour.
Models: Velon MF
External constant
When the run contact closes, the pump doses the set quantity of chemical.
Models: Velon MF
Modbus with level control
The pump is controlled via the Modbus RTU protocol: dosing management is handled entirely by your PLC.
Models: Velon PM
Pause / work
The pump runs the programmed cycle: during the WORK time it doses the set quantity of chemical; during the PAUSE time dosing is suspended.
Models: Velon MF
cc / pulse
For each pulse received from the pulse-output water meter the pump doses the set quantity, with a resolution starting from 0.0001 cc.
Models: Velon MF
Pulses
The pump doses in proportion to the pulses received from an external controller.
Models: Velon MF
PPM
Dosing is calculated from the pulses of the pulse-output water meter and the set PPM value; the concentration of the chemical and the volume per stroke can be programmed.
Models: Velon MF
Millilitres per quintal
Dosing is calculated from the pulses of the pulse-output water meter and the set MLQ value (millilitres per quintal).
Models: Velon MF
Percentage
Dosing is calculated from the pulses of the pulse-output water meter and the set percentage (%).
Models: Velon MF
Batch
A pulse from an external contact starts the dosing of the set quantity; pause and work cycles can be programmed.
Models: Velon MF
mA
The 0-4/20 mA current signal controls dosing proportionally, between the set minimum and maximum values.
Models: Velon MF
Volt
The 0-10 V voltage signal controls dosing proportionally, between the set minimum and maximum values.
Models: Velon MF
Proportional to pH
The required pH value (SET POINT) is set: the pump measures the pH by means of a pH electrode and progressively reduces the injection frequency as the set value approaches, stopping when the SET POINT is reached.
Models: Velon PO
Proportional to Redox
The required Redox potential (ORP) (SET POINT) is set: the pump measures it by means of a Redox electrode and progressively reduces the injection frequency as the set value approaches, stopping when the SET POINT is reached.
Models: Velon PO
Automatic pH dosing
Once the pool volume has been set, the pump automatically adjusts dosing according to the required pH (SET POINT), measured by means of a pH electrode: the injection frequency is progressively reduced as the set value approaches, until the pump stops when the SET POINT is reached.
Models: Velon PO
Automatic Redox dosing
Once the pool volume has been set, the pump automatically adjusts dosing according to the required Redox potential (ORP) (SET POINT), measured by means of a Redox electrode: the injection frequency is progressively reduced as the set value approaches, until the pump stops when the SET POINT is reached.
Models: Velon PO
Timer
Up to 16 weekly on/off timers can be programmed, during which the pump doses the set quantity of chemical.
Models: Velon MF
Technology
Stepper motor peristaltic technology
Peristaltic pumps deliver the product continuously; the electronically controlled stepper motor optimises dosing, which is continuous and free of pulsations. The flow rate is adjusted by frequency, by varying the number of revolutions per minute of the motor.
Stepper motor
The stepper motor and the control software deliver the product optimally with completely silent operation, a feature appreciated when dosing aromatic essences in saunas and Turkish baths, or pH regulator and disinfectant in swimming pools and hot tubs.
TPV peristaltic tube
The tube is made of TPV, an elastomer compatible with most chemicals, which retains its elastic properties even after millions of compression cycles by the rollers. The Velon is also suitable for dosing products that release gas, such as hydrogen peroxide or peracetic acid.
Colour display
Colour-coded status indication
On the Velon MF and PO the display colour changes according to the operating status, so that an alarm can be recognised even from a distance.
Green
Normal operation according to the set parameters, no active alarms.
Yellow
Non-blocking alarm, for example waiting for an external signal.
Red
Blocking alarm, for example the chemical in the tank running out.
White
Pump stopped by an external control signal (stand-by).
Remote control
Remote control and connectivity
The Velon MF and PO pumps support two-way remote control: from the cloud portal, via Wi-Fi, settings can be changed, operation can be checked and alarms can be received; alternatively, they can be integrated into a PLC via Modbus RTU and programmed via Bluetooth from a smartphone. The Velon PM can be controlled via Modbus RTU.
Integrated Wi-Fi Standard (MF, PO)
Allows connection to the Nimbus cloud portal to change settings, check operation and receive alarms, such as the chemical running out.
Integrated Modbus RTU Standard (MF, PM, PO)
Integration into your PLC: all pump parameters can be managed from your control interface.
Bluetooth Standard (MF, PO)
Pump programming directly from a smartphone.
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.
Technical data
Performance and configurations
Performance varies with the diameter of the peristaltic tube, with the rotation speed of the motor and with the characteristics of the chemical.
Peristaltic tubes
Suitable for dosing most chemicals.
| Tube (mm) | Max pressure (bar) | Max flow rate (l/h) | ml/rev | RPM |
|---|---|---|---|---|
| 1.6 × 1.6 | 2 | 1.8 | 0.3 | 1 – 100 |
| 1.6 × 4.8 | 2 | 12 | 2 | 1 – 100 |
Power supply options
- 230 VAC
- 110 VAC
- 24 VDC
- 12 VDC
Technical support
Troubleshooting and error messages
The most frequent causes of malfunction and the corrective actions to check before contacting technical support.
Insight: the pump does not prime and does not dose →If the pump…
Irregular dosing, leaks or air intake
- Peristaltic tube worn, hardened or deformedReplace the tube (see the procedure below).
- Non-compliant tube or tube not fitted correctlyFit the tube specified for the model and check that it is properly secured.
No dosing at start-up
- Pump not primedStop the motor, prime the pump and restart it.
- Pressure above the rated valueStop the pump immediately and check the downstream system.
Display of the Velon MF
| Message | Meaning | Action |
|---|---|---|
| LEVEL | Product low (warning) or empty (alarm). | Refill the tank. |
| OVER FLOW | The required flow rate exceeds the rated value. | Check the settings and the flow rate, then switch the pump to OFF and back to ON. |
| WARNING HOSE | The peristaltic tube has exceeded the set service life (in revolutions or in days). | Replace the tube, then reset the alarm from the MAINTENANCE menu by holding down the key for 3 seconds. |
| MC ERROR | Motor blocked. | Switch off the pump and contact us. |
| NO INPUT | The input signal is missing. | Check the external signal and its connection. |
LEDs of the Velon CL and PM
| LED | Meaning | Action |
|---|---|---|
| Steady red | Level alarm. | Refill the tank. |
| Flashing red | Motor alarm or bus communication error. | Contact us. |
| Green, goes off at every revolution | Running, dosing (clockwise rotation). | No action required. |
| Green, fast flashing | Paused (OFF), powered. | No action required. |
| Orange, goes off at every revolution | Running in reverse (emptying, anticlockwise rotation). | No action required. |
| Orange, fast flashing | Paused (OFF), in emptying mode. | No action required. |
Velon CL: hold down the ON/OFF key for 2 seconds to stop the pump; with the pump stopped, hold it down for 4 seconds to switch from dosing to emptying and vice versa.
Tube replacement
Switch off and disconnect the pump, close the valves and drain the liquid. Open the cover, remove the rotor cover disc and take out the slide with the worn tube; insert the new slide and bring the tube into position by turning the roller holder. Check by hand that it rotates freely, reassemble and carry out a dry test. If the roller holder is removed, the letter “A” must face the operator.
Flow rate check
The TEST function runs the pump for the set time (1 – 60 minutes): measuring the chemical drawn in makes it possible to determine the actual flow rate under the installation conditions.
If the problem persists, contact us. Before sending the pump for servicing, empty the pump head of chemical and dry it.
Summary
Main features
Electronic flow rate adjustment
According to the operating mode and the set parameters, the pump automatically adapts the injection frequency to ensure the required dosing.
Digital display
The integrated LCD display allows the pump to be programmed and its operating status to be monitored at all times.
Models: Velon MF, Velon PO
Level control
The pump is supplied with a low-level probe for the tank: when the chemical runs out, it shows the alarm on the display and activates the corresponding output.
Stand-by
Pump start and stop can be controlled remotely by means of a run/stop contact from a PLC or another source.
Models: Velon MF, Velon PO
Alarm output (optional)
On request, in the event of a fault a volt-free contact is activated, configurable as normally open (N.O.) or normally closed (N.C.), to drive a visual or audible signalling device, send an SMS or report the event to a PLC.
Models: Velon MF, Velon PO, Velon CL
Technical advice
Tell us about your application: our technical staff will recommend the most suitable model, configuration and accessories.