Walchem Intuition-6 Series Water Treatment Controller

The Walchem Intuition-6 is a wall-mount water treatment controller that measures conductivity, pH, ORP and disinfectant concentration and controls chemical metering pumps and valves through six relay outputs. A universal sensor input lets the same controller work with contacting or electrodeless conductivity sensors, amplified pH/ORP/ISE electrodes and Walchem disinfection sensors. As the Walchem distributor in Turkey, Mikron Proses (Üsküdar, Istanbul) supplies Intuition-6 controllers and compatible sensors, and provides application consulting, panel integration, commissioning and calibration support. See the Walchem brand page for the wider range.

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Measurement performance

Contacting conductivity is covered with four cell constants (0.01, 0.1, 1.0 and 10.0), from 0-300 µS/cm up to 0-300,000 µS/cm, and electrodeless (toroidal) sensors cover five ranges from 500 to 2,000,000 µS/cm, all with ±1% of reading accuracy. pH is measured from -2 to 16 with ±0.01% of reading accuracy, and ORP or ion selective electrodes from -1500 to 1500 mV. Disinfection sensors are read from -2000 to 1500 mV. With amperometric chlorine sensors, the Intuition-6 can report chlorine measurements in accordance with EPA Method 334.0.

Inputs, outputs and control

Each of the six relay outputs can be configured independently, and six virtual inputs and six virtual outputs allow interlocks and calculated values to be built inside the controller. Lead/lag control shares the load between metering pumps. An optional dual 4-20 mA analog input board brings in values such as a fluorometer signal or another process measurement. Six digital inputs accept a flow switch, a contacting water meter (0-10 Hz) or a paddlewheel flowmeter (0-500 Hz).

Communication and display

A 5-inch color touchscreen with icon-based programming and multiple language support is used for setup. Sensor values and control output status can be graphed on the screen and on a web page, and the controller can send e-mail alarm messages, datalogs, graphs or system summary reports. The Ethernet option gives remote access over the internet or a local network and, in the variant with Modbus TCP and BACnet, connects the controller to building or plant systems.

Choosing between Intuition-6 and Intuition-9

The Intuition-6 has six relays and up to two sensor inputs. For plants that need more channels, see the larger Walchem Intuition-9 series. 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. For the sensor families, see the conductivity sensors, the WEL and WDS pH/ORP sensors and the amperometric disinfection sensors, and for related background the cooling tower automation guide.