Walchem Intuition-9 Series Water Treatment Controller

The Walchem Intuition-9 is a wall-mount water treatment controller for installations that need many measurement points in one device: depending on the model code it offers up to 24 analog sensor inputs and up to 12 relay outputs. It measures conductivity, pH, ORP and disinfectant concentration and controls chemical metering pumps and valves. As the Walchem distributor in Turkey, Mikron Proses (Üsküdar, Istanbul) supplies Intuition-9 controllers and sensors, and provides application consulting, panel integration, commissioning and calibration support.

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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 with ±1 mV accuracy. The 12 digital inputs can be configured as state contacts, low speed counters (0-20 Hz) or high speed counters (0-500 Hz, paddlewheel flowmeter).

Expansion and corrosion monitoring

Four I/O slots allow analog outputs, additional sensors or a Linear Polarization Resistance (LPR) corrosion sensor to be added. The corrosion sensor is listed for pressures up to 10 bar and temperatures up to 70 °C and gives a real-time reading of corrosion rate, which is useful in cooling tower and boiler water applications. Sixteen virtual inputs and sixteen virtual outputs let complex control logic be defined inside the controller.

Communication and interface

A 7-inch color touchscreen with icon-based programming and multiple language support simplifies setup. Ethernet (10/100) or WiFi provides remote access over the internet or a local network, and BACnet or Modbus TCP can be added to connect the controller to building or process automation. A USB port is available for local data transfer, and the controller can send e-mail alarm messages, datalogs, graphs and system summary reports.

Choosing and replacing

The right configuration depends on the number of parameters to be measured, the sensor types and the existing automation (BACnet or Modbus). For smaller installations see the Walchem Intuition-6 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 cooling tower programs see the cooling tower automation guide.