The 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 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.