Walchem W100P Series Panel-Mount Controller (WCNP / WPHNP / WPHBP)

The Walchem W100P is a panel-mount controller in a 1/4 DIN (92 x 92 mm) NEMA 4X (IP65) enclosure that measures conductivity, pH, ORP/ISE or disinfectant concentration through one sensor input, and controls chemical feed through four outputs and an isolated 4-20 mA output. Which parameter is read depends on the sensor that is connected. W100P is the earlier model code of the controller now named P100. As the Walchem distributor in Turkey, Mikron Proses (Üsküdar, Istanbul) supplies sensors for W100P and P100 installations and provides application consulting for calibration and retrofit to current Walchem controllers.

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Ordering codes

The first letters of the model code select the sensor input: WCNP is the universal input (contacting or electrodeless conductivity, amplified pH/ORP, disinfection), WPHBP takes non-amplified pH/ORP electrodes with a BNC connector and WPHNP takes non-amplified electrodes without a connector. In the middle of the code, 110 means four dry contact relays and 120 means two pulse outputs and two dry contact relays; the letter A adds one isolated 4-20 mA output.

Measurement and control

On the conductivity side, the universal input works with contacting and electrodeless sensors; the range follows the connected sensor, up to 0-300,000 µS/cm for contacting sensors and up to 2,000,000 µS/cm for toroidal sensors. For pH and ORP, amplified WEL and WDS sensors connect to the WCNP, while electrodes without a preamplifier connect to the WPHBP or WPHNP. Walchem amperometric disinfection sensors are read from -2000 to 1500 mV. Large display with icon-based programming and multiple language support keep setup simple, and the four control outputs can each be given a different function.

Current model name and alternatives

Walchem lists this series as discontinued with support; the current model name is P100. For new projects, the wall-mount W100W series and the Intuition-6 series are the alternatives.