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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Dosaggio pompa dosatrice

 

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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