Two Channel Controller TOPAX DE

Two Channel Controller TOPAX DE

Important values securely under control

In a Nutshell

  • 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


Technical Details

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 voltage VAC   90 … 264, short circuit and overload-proof
Power consumption VA   24
Housing dimensions mm   302 x 231 x 107 (W x H x D) wall-mounted housing
Weight kg   2 … 2.5

Subject to technical changes


BA: Operation instruction
PI: Product information

Our Office

PT Wiya System Solution

Jl. Agung Niaga III Blok G3 No. 32, Sunter Agung
Jakarta 14350, Indonesia
Phone. 021-65836372
Fax. 021-65836374

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