Kontrol 100 - Single-parameter instrument for high-precision applications

Maximum precision The Kontrol 100 family is ideal for professional water-treatment applications that require accurate measurement of critical parameters. The devices feature a reinforced galvanic isolation and guarantee high-precision measurement. PID algorithm The Kontrol 100 series allows the user to programme outputs relating to the parameter detected according to a PID algorithm, widely used in industrial applications for process control. RS485 Modbus RTU / ASCII serial port - The RS485 serial port, on which a standard Modbus RTU / ASCII communication protocol is installed, allows the device to be connected to the local network of an existing system. The same port can also be used to connect the device to a local SEKO hub to then be managed over the internet via the SekoWeb portal. Digital & analogue outputs Kontrol 100 units have two normally-open status relays, which can be associated with measurement, probe washing, temperature or alarm repetition; they also have two 4 - 20 mA outputs and two frequency outputs, easily programmable by the end user. Probe washing It is possible to programme one of the two relays to activate a probe washing cycle. The washing method is based on three phases: activation; waiting time for measurement stabilisation after washing; waiting before a new subsequent wash. TDS function The conductivity measurement can be also visualised in ppm (parts per million) for cooling tower treatment applications and ohms (resistivity) for reverse osmosis applications; this is due to the total dissolved solids function. Temperature measure function One of the two relays, one of the frequency outputs or one of the 4 - 20 mA analogue outputs can be associated with the temperature measure. QR codes These tools have a QR code that returns the current configuration of the device on a smartphone, including advanced settings and calibration values. This function is used for helping plant technicians identify incorrect settings or understand how to improve device performance.

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Chlorine probes - FCL HP - Free high-pressure chlorine sensor

Application: Wastewater Treatment Plant Effluent

A closed-cell potentiostatic probe for free chlorine is an electrochemical sensor specifically designed for continuous monitoring of residual free chlorine (Cl₂/HOCl) in treated wastewater discharged from a treatment plant. This type of sensor is typically connected to a dual-channel controller (pH / chlorine), which allows real-time correlation between chlorine concentration and pH, ensuring safe and compliant disinfection control.

Operating Principle

The probe works according to the potentiostatic amperometric method:

Inside the probe, a working electrode and a counter electrode are separated from the sample by a selective membrane.

A constant polarization voltage is applied between the electrodes. 

Free chlorine diffuses through the membrane and is reduced at the electrode surface.  

This electrochemical reaction generates a current directly proportional to the free chlorine concentration. 

The controller converts this current into a chlorine value (ppm or mg/L). 

The closed-cell design includes an internal electrolyte chamber and membrane, isolating the electrodes from the wastewater and providing stable, repeatable measurements even in dirty or variable process conditions.

Installation in a Wastewater Discharge Line

The probe is installed in a flow cell on a bypass line downstream of the disinfection stage (chlorination). A constant and bubble-free sample flow is required to ensure accurate readings.

The dual pH / chlorine controller continuously: 

Compensates the chlorine reading based on pH 

Displays both values 

Controls chemical dosing pumps 

Generates alarms when discharge limits are exceeded

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Spring MSV - Spring-return diaphragm dosing pump

• MSV pumps are the latest addition to the Spring range. These diaphragm dosing pumps are designed to ensure reliable and effective long-term dosing of chemicals at an affordable cost. They feature motorised mechanisms with high-performance, high-efficiency motors, mounted vertically over their PP casing to save space, especially where pumps are installed adjacent to one another. 
• Thanks to its double-camshaft mechanical structure, the pump offers high levels of stability while maintaining quiet operation and exceptionally accurate flow rates. 
• Adaptable to a wide range of uses, Spring MSV stands as an excellent compromise between cost and a high dosing accuracy across a wide variety of liquids, sludge and chemicals.

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Solenoid pump head covers

 

Tekna - Wall-mounted solenoid-driven dosing pumps

• Numerous Tekna models are available, with analogic or digital interface, to satisfy almost any request from the market. • Tekna delivers reduced energy consumption thanks to an embedded stabilised multi-range power supply (100 – 240 Vac, 50/60 Hz). Thanks to the SEKO patented algorithm, the solenoid only draws the power strictly required to activate the pump, based on the actual working conditions, which improves pump efficiency and saves energy. The algorithm also compensates for any fluctuation of the power supply voltage, for giving a precise and accurate dosage in any condition. • Tekna is also available in ATEX standard-compliant versions, with constant or proportional dosage functions and a digital interface. This model comes with a SS316L pump body as standard.

Features

• Pump body in PVDF • Kit available in PVDF or PVDF-T • Patented algorithm for driving the solenoid • AKS: Constant, with analogic interface (potentiometer) • AKL: Constant with level, analogic interface • APG: Proportional dosing (4 - 20 mA/pulse), analogic interface • TPG: Multifunction proportional dosing (4 - 20 mA/pulse), digital interface • TPR: Instrument-pump with pH/ORP input, digital interface • TCK: Weekly timed pump, digital interface • Available in ATEX-certificated models (Zone 2) • Models available with 24 Vac and 12 Vdc power supply • Available with special seals in PTFE or FFKM • Available with auto-degassing pump head in PVDF • Available with Modbus RTU RS485 port for: - Integrating the pump in a more complex plant, locally managed by a PLC or an industrial PC, where other Modbus devices are already present - Connect the pump to a KommBox or a KommSpot and, through them, to the internet for management via the SekoWeb app or online portal

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Kosmo - MM2 Mechanical-return diaphragm dosing pump

• Among the Kosmo pump range, the MM2 series pumps provide superior dosing performance, making them suitable for the most demanding applications. Constructed in hard-wearing metal with a cast-aluminium housing, Kosmo MM2 can handle the largest output with flow rates as high as 2,300 l/h, at pressures up to 10 bar.

• As with all SEKO pumps Kosmo is designed using materials chosen for their robustness and chemical compatibility and is conceived to work for long periods of continuous operation thanks to the benefits derived from its variable eccentric system. SEKO’s Kosmo PTFE diaphragm is directly linked to the mechanism’s moving parts, meaning Kosmo makes use of the motor’s power both in the suction and delivery phases which allows it to deal with high suction head conditions.

• All components feature permanent lubrication, using ball bearings for the principal moving parts to help prevent overheating and extend pump life with the added benefit of quiet-running operation.

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Invikta - The market’s most user-friendly solenoid-driven dosing pumps

• The premium components chosen for the Invikta series ensure full chemical compatibility across multiple applications and guarantee long product lifespan. Invikta’s PVDF-T pump body, ceramic balls and PTFE diaphragm (guaranteed for five years) reflect SEKO’s commitment to product quality, whether affordable or high-end.

• Invikta’s compact dimensions and a truly minimal electronic control board allow SEKO to offer a cost-effective product that represents the right solution where simple functionality is a priority.

• As with all other SEKO solenoid-driven pumps, Invikta is housed within a polypropylene casing and delivers IP65 protection. This provides excellent dust and water resistance, meaning Invikta can be used safely in a multitude of environments.

• Pump body and fittings in PVDF-T • PTFE diaphragm, guaranteed for 5 years • Simple analogic interface: potentiometer and LED • KCS: Constant, without level, with adjustable flow rate • Standard seals in FKM-B or EPDM • Bracket for wall mounting • Bleed tap facilitates priming • KCS Low-Noise model available for spa applications Features

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Kompact / Compact wall-mounted solenoid-driven dosing pumps

• Kompact has been designed as a basic range of solenoid driven pumps for less demanding applications without compromising on robustness and reliability.
• With Kompact, SEKO has struck the perfect balance between using premium components that guarantee full chemical compatibility in multiple applications while ensuring affordability for the operator. 
• To satisfy every installation need, the range offers five different models, for constant and proportional dosages; three with an analogic interface (potentiometer) and two with a digital interface (keyboard and 2x8 display).

• Pump body in PVDF • Kit available in PVDF or PVDF-T • AMS: Constant, with analogic interface (potentiometer) • AML: Constant with level, analogic interface • AMC: Proportional dosing (pulse), analogic interface • DPT: Multifunction proportional dosing (4 - 20 mA/pulse), digital interface • DRP: Instrument-pump with pH/ORP input, digital interface • Available with special seals in FFKM

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Solenoid-driven pumps with mechanical stroke-length regulation

• Tekba-R’s unique features include a digital interface that allows programming via keyboard and display, whilesolenoid stroke adjustment can be performed with a mechanical knob for increased dosing precision. 
• Tekba-R is available in two models. The EML is a constant dosing pump with adjustable flow rate, while the EMG isa multifunction pump that includes operating modes timed or proportional to an analogue 4 - 20 mA signal, or to a digital signal such as that generated by a pulse-emitting water meter. 
• Tekba-R is also available with a Modbus interface, which allows the pump to be integrated into a more complex system in which other Modbus devices are already present. It’s also available with a Wi-Fi interface which enables operation via the SekoWeb app or online portal.

Features• Mechanical stroke length regulation

• EML: Constant dosing at the desired flow rate 

• EMG: Multifunction: - 4 - 20 mA analogue input - Frequency input - Remote ON / OFF input - Directly connectable to a water meter - Dosage in ppm - Functions 1: N, N: 1, 1: 1 - Timed dosing

• Available with special seals in PTFE or FFKM • Available with Modbus RTU RS485 port • Available with Wi-Fi interface that allows:

- Direct local connection to the pump for its programming via internal webserver

- Connection to a Wi-Fi network for remote management via the SekoWeb app or online portal

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The Importance of Water Balance and Disinfection in a Swimming Pool

Maintaining proper water balance and effective disinfection in a swimming pool is essential to ensure health, safety, and system durability.

Water balance refers to the correct control of key chemical parameters such as pH, alkalinity, and hardness. When these values are within the recommended range:

Disinfectants work more efficiently

Swimmers experience greater comfort (no eye or skin irritation)

Pool surfaces and equipment are protected from corrosion or scale formation 

An unbalanced pool water can reduce the effectiveness of disinfectants and cause long-term damage to piping, pumps, and fittings.

Disinfection is equally critical, as it prevents the growth of bacteria, viruses, algae, and other microorganisms. Chlorine, bromine, or alternative systems must be correctly dosed and continuously maintained to guarantee safe bathing conditions. Insufficient disinfection increases health risks, while overdosing can cause irritation and material degradation. 

In conclusion, water balance and disinfection are strictly interconnected: only balanced water allows disinfectants to perform correctly. Continuous monitoring and proper dosing systems are therefore fundamental for maintaining a safe, hygienic, and long-lasting swimming pool. 

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Glass ORP (Redox) Electrode – Key Features and Applications

A glass ORP (Oxidation–Reduction Potential) electrode measures the electrical potential generated by oxidizing and reducing substances in water, expressed in millivolts (mV). This value represents the real disinfecting power of the water, not just the chemical concentration.

How it works

The probe is made of three main elements:

• Platinum measuring electrode
  In direct contact with the water, it exchanges electrons with oxidizing agents (chlorine, chlorine dioxide, ozone, etc.) and generates a voltage proportional to the redox potential.

• Reference electrode in KCl electrolyte
  Provides a stable electrical reference.

• Ceramic junction (salt bridge)
  Allows ionic contact between the internal electrolyte and the process water, ensuring signal stability.

The difference in voltage between the platinum electrode and the reference electrode is the ORP value.

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What ORP indicates

ORP shows how strongly the water can destroy bacteria and organic matter:

• > 650 mV → effective disinfection

• 750–850 mV → strong oxidizing power

• < 500 mV → insufficient disinfection

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Main applications

Glass ORP probes are widely used in:

• Swimming pools and spas – control of chlorine, bromine, or salt electrolysis

• Drinking water treatment – monitoring disinfection efficiency

• Cooling towers – Legionella and oxidant control

• Industrial water and CIP systems

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Why use ORP instead of only chlorine

ORP measures the real disinfecting capability of water, taking into account:

• pH

• temperature

• organic load

• all oxidizing agents present

This makes it ideal for automatic dosing systems with pumps and controllers.

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PoolDose Tech Panel - pH-ORP-CL

Features

• Probe holder with membrane chlorine probe included in pH, ORP and CL versions 
• Easily connect device to SekoWeb app by scanning a QR code 
• Wi-Fi module enables pool management via SekoWeb 
• Galvanic electrical and measure insulation • Three PVDF rollers and Santoprene tubing 
• Internal relay enables chlorine generator management 
• Water meter flow rate input totalises swimming pool water changes 
• Chlorine membrane probe includes high-grade insulation 
• Installation kit included 
• Multi-language menu 
• Wizard probe calibration and degree of health 
• No technical skill required 
• Circulation pump checks “Power On” flow trigger
• Input temperature probe range 0 - 55°C for measure compensation only 
• Input level probe checks product levels 
• pH and chlorine relay enables extra dosing 
• Proportional dosing TWM (time width modulation) mode

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SEKO’s PolyCendos Series - Effective polymer metering

A complete range of polymer batching and metering systems

PolyCendos automatically prepares polymer solutions which are used as coagulants for the eventual removal of suspended particles in multiple water-treatment processes. These applications include swimming pool maintenance, oil recovery, colour removal, paper production, mineral processing and the various stages of wastewater treatment. The PolyCendos family comprises four models offering up to 8,000 litres of polymer solution per hour. The range also comes with a variety of electrical control panels, mixers, diaphragm pumps and tank sizes to offer an optimal solution for every application. Its design also means that PolyCendos delivers flexible and compact footprint solutions to fit even confined spaces.

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How turbidity measurement works using an optical 90° scattered light probe

Water turbidity is a parameter that indicates the amount of suspended solid particles (sludge, colloids, bacteria, oxides, organic matter) that make the water cloudy. The higher the turbidity, the lower the water clarity and the higher the concentration of suspended solids. The S461 ST turbidity sensor uses the 90° scattered light optical principle (nephelometry), which is today one of the most reliable technologies for measuring turbidity in process water, wells, surface water and wastewater.

Measurement principle: 90° scattered light

Inside the probe there are:

A LED light source that emits a stable light beam, A photodetector positioned at 90° to the light beam

When the water is clear, the light passes through it with very little deviation.

When suspended particles are present, they intercept the light and scatter it in all directions. A portion of this scattered light reaches the detector located at 90°. The more particles are present, the stronger the scattered light signal becomes. This signal is converted into a turbidity value expressed in NTU (Nephelometric Turbidity Units). 

Why the 90° geometry is so reliable, The 90° detector position allows the sensor to:

Exclude the direct transmitted light, minimize the influence of water color, measure only the light actually scattered by suspended particles, this makes the measurement stable and accurate even in dark, colored or heavily polluted water. 

Importance of proper installation geometry

For accurate measurement, the optical window of the probe must face a free and unobstructed measurement volume. 

As shown in the illustration:

At least 5 cm (2 in) of free space must be maintained in front of the optical cone

At least 10 cm (4 in) distance must be kept from walls, tank bottoms or pipe surfaces

This prevents:

Optical reflections, False high turbidity readings, Signal instability, Signal conversion and process control

The probe converts the scattered light intensity into a 4–20 mA output signal, which can be connected to: 

Controllers

PLCs, Data loggers, SCADA systems, This allows turbidity to be:

Continuously monitored

Used to control filters, backwash cycles or chemical dosing. Logged for process optimization and regulatory compliance.

Technical conclusion

The 90° optical turbidity measurement principle used by the S461 ST probe provides reliable and repeatable monitoring of water quality, even in demanding applications such as wastewater, well water and industrial process water.

Correct mechanical installation and proper optical geometry are essential to turn the sensor into a truly effective process control instrument.

👉 In water treatment systems, turbidity is not just a number: it is one of the earliest indicators of contamination, process instability and filtration problems.

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Kontrol 40 - single-parameter control instrument

The Kontrol 40 range is designed to ensure maximum safety, user-friendliness and ease of installation for the end user; it is made so that the maintenance of the electronic circuits is as simple as possible without having to reconfigure all the electrical connections. The instruments are available in four different formats:

• For mounting on DIN BAR - IP40

• 48 x 96 mm format for panel mounting - IP40

• 96 x 96 mm format for panel mounting - Front IP65 / Rear IP20

• 144 x 144 mm format in airtight box for wall mounting - IP65

All models have two normally-open relays that can be managed and activated when two independent thresholds are exceeded, as well as a programmable 4 - 20 mA analogue output. A self-explanatory and easy-to-read menu guides the operator step by step in configuring the device, making programming quick and simple.A statistical menu displays the number of activations performed by the two

relays, as well as the number of alarm conditions encountered and the number of pause signals received (input reed signal).

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Side Channel Blowers

The side channel blower is an electromechanical machine used for air handling in low-flow, medium-pressure applications, both in blowing and suction modes. Thanks to the side channel operating principle, it ensures continuous, pulsation-free operation with minimal maintenance requirements.

The air filter, installed on the suction side, protects the blower from dust and solid particles, preserving the integrity of the impeller and increasing the reliability and service life of the unit, especially in industrial or harsh environments. 

The safety valve is a key protective device for the system: it automatically intervenes in the event of excessive overpressure or vacuum, preventing mechanical overloads and damage to the blower. Its presence ensures safe operation and compliance with good engineering practice. 

👉 Final note for professionals: correct selection and installation of the blower, air filter, and safety valve are essential to guarantee consistent performance, operational safety, and long service life of the system.

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Dosing & Injection Packages

Each SEKO dosing package is designed, assembled, and tested to the highest international standards, featuring precision-engineered components such as calibration pots, safety valves, pulsation dampers, and instrumentation to guarantee accurate and secure chemical handling. With multiple configurations available, SEKO dosing systems are adaptable to different flow rates, pressures, and chemical compatibilities, allowing customers to select the ideal solution for their operational needs. From single-pump skids to complex dosing arrangements, SEKO technology supports a wide spectrum of applications with proven performance and long-term dependability. Backed by a global logistics and support network, SEKO combines engineering excellence with worldwide reach to deliver efficient, high-quality dosing solutions that embody our long-standing values of innovation, technology, and future-focused design.

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Pompa di dosaggio SEKO TEKNA TCK (pompa dosatrice elettromagnetica temporizzata)

Principio di dosaggio

La pompa non dosa “a richiesta” ma secondo un programma temporale:

1. Impostazione del timer: si programma una sequenza temporale settimanale (es. orari e giorni della settimana in cui attivare il dosaggio). Puoi settare fino a 10 eventi di dosaggio a settimana. 

2. Attivazione temporizzata: quando arriva l’ora programmata, la pompa si avvia e inizia a erogare il prodotto chimico. 

3. Costanza della portata: durante l’erogazione, la pompa dosa con flusso costante corrispondente al modello scelto (litri/ora), determinato dal numero di corsi al minuto e dal volume per corsa. 

   ➤ Esempio semplice: se hai programmato un dosaggio settimanale ogni lunedì alle 08:00 per 5 minuti, la pompa si avvierà a quell’ora e erogherà quantità di liquido in funzione della portata dichiarata (es. 10 l/h se configurata così). Dopo i 5 minuti si ferma fino alla prossima programmazione.

🔹 Componenti chiave del dosaggio

• Timer programmabile settimanale → decide quando erogare. 

• Portata costante → definisce quanto dosa in un determinato tempo. 

• Membrana elettromagnetica → crea il flusso dosato tramite corsa alternata controllata. 

🔹 Riassumendo in termini operativi

✔ Programmi gli eventi di dosaggio sul timer (giorni/ore)

✔ La pompa si avvia automaticamente nei momenti impostati

✔ Eroga il prodotto in modo misurabile e ripetibile, basato sulla portata del modello

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SWIMMING POOL

 

Manutenzione delle valvole di aspirazione e mandata nelle pompe dosatrici: quando intervenire

Le valvole di aspirazione e mandata rappresentano i componenti più critici di una pompa dosatrice, in quanto garantiscono la corretta direzione del flusso e la stabilità della portata erogata. Una manutenzione regolare di questi elementi è essenziale per preservare l’affidabilità dell’impianto, mantenere la precisione del dosaggio e prevenire fermi non programmati.

Intervalli di manutenzione consigliati

1. Manutenzione ordinaria programmata (6–12 mesi)

Nella maggior parte delle applicazioni con prodotti chimici non particolarmente aggressivi, la manutenzione delle valvole dovrebbe essere eseguita con una frequenza compresa tra 6 e 12 mesi. Questo intervallo rappresenta il riferimento tipico indicato dai principali costruttori di pompe dosatrici.

2. Applicazioni con prodotti incrostanti o viscosi (3–6 mesi)

In presenza di sostanze che tendono a cristallizzare o generare sedimenti — come ipoclorito di sodio, polifosfati, calce, polielettroliti, flocculanti o soluzioni ad alta viscosità — le valvole sono soggette a un’usura più rapida. In questi casi è raccomandato ridurre l’intervallo di manutenzione a 3–6 mesi.

3. Impianti con funzionamento continuativo

Per pompe che operano su cicli prolungati o continui (ad esempio H24), l’usura delle valvole è più rapida. È opportuno programmare la manutenzione ogni 4–6 mesi per evitare cali di prestazione e fenomeni di mancata chiusura delle sfere.

4. Riavvio dopo fermi prolungati

Un impianto rimasto inattivo per oltre 2–4 settimane può presentare valvole incollate, ostruzioni o depositi interni. Prima del riavvio è consigliabile un controllo preventivo e un’eventuale pulizia delle sedi e degli O-ring.

5. Intervento in caso di sintomi di malfunzionamento

Indipendentemente dalla programmazione, è necessario intervenire immediatamente se si verificano:

• difficoltà di adescamento;

• portata instabile o ridotta rispetto ai valori nominali;

• presenza di bolle o gas nella testa pompante (tipico dell’ipoclorito);

• arresti ripetuti della pompa;

• rumori o vibrazioni anomale.

Questi segnali indicano spesso una scarsa tenuta delle valvole o un’usura delle sedi.

Contenuti tipici della manutenzione

La manutenzione delle valvole comprende:

• smontaggio delle valvole di aspirazione e mandata;

• pulizia delle sedi e rimozione dei sedimenti;

• verifica e sostituzione di sfere, sedi e O-ring;

• controllo della testa pompante e del serraggio;

• sostituzione dei kit valvole quando necessario.

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Conclusione

Una corretta manutenzione delle valvole di aspirazione e mandata è determinante per garantire precisione, continuità operativa e sicurezza del processo. Stabilire intervalli di ispezione basati sul tipo di chimico, sul regime di funzionamento e sulle condizioni reali dell’impianto permette a progettisti e installatori di prevenire fermate improvvise e mantenere elevate prestazioni nel dosaggio.

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