We are a leading company in the water treatment microprocessor manufacturing industry. Our products are devices specially designed for the water treatment industry.E.W.S. presents a new filter/softener water treatment controller: SFS8000E.W.S. presents a new cooling tower water treatment controller: CTS8000E.W.S. presents a new ultrafiltration water treatment controller: UFS8000Water treatment products | E.W.S | water treatment controllers - accessoires - chemical testkits


Used for the fully automatic monitoring of simple cooling tower systems.

AS3020 cooling tower controller for monitoring of conductivity


The AS3020 cooling tower controller monitors the conductivity of the water, and if during a given set time it should exceed a predetermined sediment level, then the flush valve will be opened. Two level-switches can also be connected to the controller which control an inlet valve. This inlet valve opens when the tank is empty. Depending upon the programming the flush valve can be closed or it can stay open until the tank is full again. If this happens, the system will switch to the refill stage. When the tank is full, then the inlet valve will be closed off and the conductivity will once again be controlled.


  • User operated programming using double row of illuminated LCD display
  • Display text in English, French, German or Dutch
  • Adaption to user specific requirements by means of options programmable on site
  • Extensive status report facility using information button
  • 2 inputs : tank full and tank empty
  • 2 powered realy outputs: Inlet valve (fused 8A), Flush valve (fused 8A)
  • 1 relay output (dry contact) : Alarm
  • Secure from power failure as all data is stored long-term without battery
  • Efficient micro controller with watchdog, illegal operation code and cycle monitoring
  • Safeguarded from EMC by galvanic separation between microcontroller and in- and output circuits and also by additional interference suppression filter
  • Available for wall mounting
  • Available (input /output) : 12VDC/12VDC, 24VDC/24VDC, 24VAC/24VAC, 115VAC/115VAC, 230VAC/230VAC
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