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Walchem

Walchem W100W Series Wall-Mount Controller

Walchem W100W is an entry-level wall-mount controller with one universal sensor input for conductivity, pH, ORP/ISE or disinfection, three control outputs and an optional 4-20 mA output.

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Walchem W100W Series Wall-Mount Controller — describe your application and we will help you identify the right model and configuration together.

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Technical specifications

Walchem W100W wall-mount controller with a graphic display, mounted next to a flow switch manifold and three pulse cables
Model familiesWCNW (contacting or electrodeless conductivity), WPHPW (amplified pH/ORP/ISE electrodes), WPHBW (non-amplified electrodes with BNC connector), WPHNW (non-amplified electrodes with bare wires), WDSW (disinfection sensors)
Conductivity rangesContacting sensors: 0-300, 0-3,000, 0-30,000 and 0-300,000 µS/cm for cell constants 0.01, 0.1, 1.0 and 10.0; electrodeless sensors: 500-2,000,000 µS/cm in five ranges; accuracy ±1% of reading
pH, ORP and disinfection rangespH -2 to 16 (±0.01% of reading); ORP and ion selective electrode -1500 to 1500 mV (±1 mV); disinfection sensors -2000 to 1500 mV (±1 mV)
Control outputsThree; model code 100: three powered relays, 110: three dry contact relays, 120: two pulse outputs and one dry contact relay; relays rated 6 A resistive, 1/8 HP
Analog outputOptional isolated 4-20 mA output (accuracy ±0.5% of reading) for recording, datalogging or connection to SCADA
Digital inputsTwo optically isolated inputs: interlock, contacting flowmeter (0-10 Hz) or paddlewheel flowmeter (0-500 Hz)
Enclosure and displayWall-mount polycarbonate enclosure, NEMA 4X (IP65); 128 x 64 backlit graphic display with icon-based programming; multiple language support; ambient temperature -20 to 55 °C
Relay functionsOn/off setpoint, time proportional, pulse proportional and PID control (with 4-20 mA or solid-state pulse outputs), probe wash timer, timer-based activation

The Walchem W100W is an entry-level wall-mount water treatment controller with one universal sensor input and three control outputs. Which parameter it reads (conductivity, pH, ORP/ISE or disinfectant concentration) depends on the connected sensor, and the model code selects the matching input. As the Walchem distributor in Turkey, Mikron Proses (Üsküdar, Istanbul) supplies W100W controllers and sensors and provides application consulting for sensor and output selection.

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Inputs and outputs

The universal sensor input lets the same controller work with almost any conductivity or pH sensor type. Three pH/ORP/ISE models are available: one for amplified electrodes, one for non-amplified electrodes with a BNC connector and one for non-amplified electrodes with bare wires. A separate model reads disinfection sensors. Three control outputs, available as powered relays, dry contact relays or two pulse outputs plus one dry contact relay, allow wider use than other entry-level controllers, and an optional isolated 4-20 mA output serves recorders, datalogging or SCADA. Two digital inputs accept a flow switch, a contacting water meter or a paddlewheel flowmeter.

Setup and programming

A large graphic display with icon-based programming makes installation and commissioning straightforward, and multiple language support helps with installations in different regions. Each relay can be given its own function, including on/off setpoint control, time-proportional control, probe wash and timer-based activation; pulse-proportional and PID control are available with the 4-20 mA or solid-state pulse outputs.

Panel-mount counterpart and cooling tower version

For the same job inside a control panel, see the 1/4 DIN W100P series panel-mount controller (current name P100). For cooling tower and boiler conductivity control with the W100W platform, see the W100W cooling tower and boiler controller. Device selection depends on the parameter to be measured, the sensor type and the existing automation; see also the Walchem brand page.

Applications

  • Wastewater neutralization and disinfection
  • Food and beverage disinfection
  • Potable water treatment
  • Swimming pools and spas
  • Cooling tower biocide control
  • Metal finishing and printed circuit board
  • Irrigation and fertigation
  • RO systems

Datasheets and manuals

Documents were last compared with the manufacturer's source on 2026-09-24.

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