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Two Channel Controller TOPAX DE

Two Channel Controller TOPAX DE

Important values securely under control

The further developed TOPAX DE is based on the proven and tested modern technology of our multi-channel controller TOPAX DX and is available in different versions. The modular design makes the TOPAX DE to adaptable and highly compatible partner in the field of measuring and control technology. With the option of connecting it directly to a variety of sensors to measure the water parameters, every TOPAX DE version fulfils the demands for optimal water preparation.


Two-Channel Controller TOPAX DE

  • Measuring free chlorine with open amperometric 2-electrode measuring cell, 3-electrode measuring cell with potentiostatic control or diaphragm-covered measuring cells
  • Measurement of the pH value and temperature
  • Redox measurement for disinfection control
  • Display of the effective chlorine according to dissociation curve
  • 4 measurement values and 5 digital inputs, galvanically isolated
  • Analogue outputs 0/4 … 20 mA for measurement or control values, galvanically isolated
  • 2 controllers for controlling the parameter for disinfection and
    the pH value
  • pH value compensation of the chlorine value
  • Temperature compensation of the pH value
  • Modbus protocol via RS 485
  • Memory card for data logger and logbook
  • Very easy to operate, guided start up
  • Large display with operator guidance in plain language, a flat, multilingual menu structure and context oriented online help
  • Integrated 24 h screen writer
  • Display of the quality of the measuring cells during calibration
  • Validity check during calibration

Click to Enlarge Image

Display and controls
  • Colour display with graphical capabilities,
    5.7 inch, 320 x 240 pixels with background lighting
  • 6 sensor keys to navigate the menu
  • 5 sensor keys to control the cursor
  • Measuring input for free chlorine
    Measuring cell-options
    Amperometric 2-electrode measuring cells, measuring range adjustable from 0 … 10 mg/l
    Amperometric 3-electrode measuring cell with potentiostatic control, measuring range adjustable from 0 … 2 mg/l
    Diaphragm-covered measuring cell, 0/4 … 20 mA, measuring range according to the sensor
    (max. 10 mg/l)
    Further measurement inputs
  • pH value, measuring range: pH 0 … 14
  • Temperature, measuring range -10 … +100 °C
  • Total chlorine, 4 … 20 mA input, diaphragm covered measuring cell, 24 VDC supply of the measuring cell
  • Digital inputs Inputs for:
  • Low level alert and main alarm of the chemical tank dosing pump 1 and dosing pump 2
  • Measuring water deficiency of the regulating function with alarm (external cut off)
  • Connection of the inputs and outputs By means of terminal blocks, max. 1 mm2
    Control characteristic for 2 inputs (disinfection and pH value)
  • P, PI, PD or PID performances
  • Fixed value regulation, standard channel selectable, disturbance variable feed forward (optional), 2-sided control
  • Disturbance variable (optional) 0/4 … 20 mA programmable, disturbance factor: 0.1 … 10 times amplification
    Controller outputs
    (each as per the configuration)
    3 digital outputs, optocoupler, 48 V DC; 250 mA, pulse frequency 10 … 350 pulses/min.
    5 relay outputs programmable as
  • ON/OFF
  • Pulse frequency 10 … 100 pulses/min.
  • Pulse length 10 … 120 seconds
  • 3-point step output with feedback position, value of the Potentiometer 1 … 10 kOhm
  • Analogue outputs 0/4 … 20 mA, max. load 500 Ohms
    Alarm output Relay output as collective alarm for the measured variables of free chlorine, pH value, Redox potential, temperature as potential free changer
    Measurement value alarm, min. and max. alarm freely adjustable. Time delay adjustable max. 200 minutes
    Safety cutout
    To prevent overdosing (Y-alarm), time delay adjustable: max. 200 minutes
    Current outputs for remote transfer of the measured value to the inputs Current outputs for each measured value 0/4 … 20 mA possible spreading; max. load 500 Ohms potential free
    Significant geometric spreading:
    >50 % with measuring input free chlorine and
    0/4 … 20 mA
    >10 % during measurement input of pH value and Redox potential
    Interface (optional) Modbus protocol via RS 485
    Load capacity of the relay 230 V / 50 Hz, 3 A
    Protection class IP65 with locked screw connections
    Ambient temperature°C -5 … +45
    Supply voltageVAC 90 … 264, short circuit and overload-proof
    Power consumptionVA 24
    Housing dimensionsmm 302 x 231 x 107 (W x H x D) wall-mounted housing
    Weightkg 2 … 2.5

    Subject to technical changes


    BA: Operation instruction
    PI: Product information


    Click the link to request a quote.

    Lutz-JESCO America Corp.
    55 Bermar Park
    Rochester, NY 14624
    Toll-Free: +1-800-554-2762
    Fax: +1-585-426-4025


    Outside the U.S.
    Tel.: +1-585-426-0990