Walchem W600 Series Controller

The Walchem W600 is a wall-mount water treatment controller that brings conductivity, pH, ORP and disinfectant measurement together in one device, with six control outputs and an optional Ethernet card for remote access. It controls chemical dosing, blowdown cycles and alarms from one touchscreen interface in cooling tower and boiler programs. The W600 has been discontinued: it is on Walchem’s list of discontinued products (checked on 19 August 2026). For new installations see the Intuition-9 or the Intuition-6. As the Walchem distributor in Turkey, Mikron Proses (Üsküdar, Istanbul) supplies sensors for existing W600 installations and provides application consulting for the move to a current controller.

Existing W600 and replacement enquiries → Send us your requirement

Inputs and outputs

Up to two sensor input cards take contacting conductivity, electrodeless conductivity, disinfection sensors or amplified pH/ORP, and each card includes a temperature input. Optional dual 4-20 mA analog input cards add fluorometers or nearly any other process value. The six control outputs are configured through the model code (powered relays, dry contact relays and opto-isolated pulse outputs), and an optional dual isolated 4-20 mA output card is available. Each relay can use on/off, time-proportional or pulse-proportional control (with solid-state relays), in-range or out-of-range activation, probe wash, timers, flow-total activation and alarms. For cooling tower and boiler applications there is also a biocide timer and boiler blowdown on conductivity using intermittent sampling.

Connectivity

The optional Ethernet card gives remote access over the internet or a local network, sensor values and control output status can be graphed on the screen, and the controller keeps a datalog. A USB port is used to upgrade the software, to save the settings of one controller and import them into another, and to export readings and relay events.

Existing sensors

Mikron Proses has confirmed that sensors used with W100, W600, W900 and P1000 series Walchem controllers are compatible with the Intuition-6 and Intuition-9, so existing sensors can stay in place when a controller is renewed. See the Walchem conductivity sensors and the Walchem brand page.