Seko Tekna Solenoid Dosing Pumps Chemical Dosing Control

The Seko Tekna solenoid dosing pump range shares identical high-durability hardware across all models—including a solid PTFE diaphragm, ceramic ball valves, PVDF pump head, and IP65 enclosure.

However, the Seko Tekna AKL, TPG, and TPR Series differ significantly in their control architecture, operational logic, and target applications:

1. Seko Tekna AKL Series – Manual / Analog Constant Dosing

The AKL is the simplest, entry-level analog model designed for straightforward, continuous chemical injection.

• Operational Control:
  • Manual knob regulation for stroke frequency (0–100%).
  • Features a dual-scale switch (0–20% and 0–100%), allowing fine manual adjustment down to lower dosing rates.
  • Equipped with a tank level probe input to stop the pump when chemical stock is low.
• Control Inputs: Basic ON/OFF operation; no external signal integration or digital display.
• Primary Use Cases:
  • Fixed-rate chemical dosing where flow rates do not fluctuate.
  • Shock dosing or basic biocide treatment in small cooling towers.
  • Constant dosing of coagulants or polymers in steady industrial wastewater systems.
  • Basic agricultural or fertigation setups running on simple timer plugs.

2. Seko Tekna TPG Series – Advanced Digital Proportional Dosing

The TPG is a digital microprocessor-controlled model equipped with a backlit LCD screen. It is designed for system integration and dynamic chemical pacing based on external signals.

• Operational Control:
  • Proportional 4–20 mA Input: Speeds up or slows down based on an external signal from PLC units, flowmeters, or external transmitters.
  • Digital Pulse Input (Water Meter): Doses proportionally to main line water flow using 1:N or N:1 pulse multipliers/dividers.
  • Advanced Functions: Includes PPM target dosing mode, batch dosing, built-in timer, dosing statistics logging, password protection, and remote ON/OFF control.
• Primary Use Cases:
  • Variable-Flow Water Treatment: Dosing chlorine, disinfectants, or antiscalants proportional to real-time water flow rates (e.g., connected to a pulse water meter).
  • PLC-Driven Industrial Plants: Receiving 4–20 mA pacing commands from central SCADA or automation panels.
  • Precise batch dosing systems or processes requiring strict PPM dosing targets.

3. Seko Tekna TPR Series – Self-Contained Digital Controller Pump

The TPR expands on the TPG platform by integrating a built-in water parameter controller (pH or ORP/Redox reader) directly into the pump housing.

• Operational Control:
  • Direct Sensor Connect: Accepts direct BNC input from a pH probe or ORP (Redox) sensor without needing a standalone wall-mounted controller panel.
  • Temperature Compensation: Features a dedicated PT100 probe input for automatic temperature-compensated pH readings.
  • Proportional Feedback Loop: Automatically adjusts its stroke rate (dosing speed) as the liquid parameter approaches the set-point (e.g., maintaining target pH 7.2 or target ORP +650 mV).
  • Auxiliary Signal Output: Includes a 4–20 mA output relay to transmit live pH/ORP readings back to a recorder or telemetry system.
• Primary Use Cases:
  • pH Correction Systems: Automated acid or caustic injection for industrial effluent treatment, neutralized tank discharge, or commercial swimming pools.
  • Disinfection & Chlorination: Automated chlorine or oxidizer dosing guided by real-time ORP/Redox measurement.
  • Compact, all-in-one installations where space or budget does not allow for a separate external controller panel.