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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