Walchem's W900 series of controllers are value-priced, high-level controllers that ensure unparalleled versatility in water treatment.
PRODUCT

Walchem Controller W900
(Value-priced, high-level controllers)
The versatile design of Walchem's W900 series of controllers is suitable for a range of applications in cooling towers, boilers or general water treatment. The W900 controllers offer online access over WiFi and through a BACnet, as well as through Ethernet or LAN. These controllers are easy to program and set up.
In-built with Walchem Fluent™ – a cloud-based software tool that provides real-time access to your process, alarm notifications with escalations, data graphing and storage.
Manufactured by: Walchem Corporation, USA
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Technical Details
- Cell contacting conductivity: 0-300 μS/cm
- Cell contacting conductivity: 0-3,000 μS/cm
- Cell contacting conductivity: 0-30,000 μS/cm
- 10.0 Cell contacting conductivity: 0-300,000 μS/cm
- pH: -2 to 16
- ORP: -1500 to 1500 mV
- Disinfection sensors: -2000 to 1500 mV / 0 - 2 ppm to 0 - 20,000 ppm
- Electrodeless conductivity: 500 to 2,000,000 uS/cm
- Material of construction: Polycarbonate/NEMA 4X; display - 320 x 240 pixel monochrome backlit display with touch screen Applications
- Cooling tower biocide control
- RO systems
- Metal finishing and printed circuit board
- Swimming pools and spas
- Food and beverage disinfection
- Portable water treatment
- Active pharmaceutical ingredients process Key Features
- Large touchscreen display with icon based programming makes setup easy
- Universal sensor input provides extraordinary flexibility; the same controller can be used with almost any type of sensor needed
- Four I/O slots allow complete flexibility in adding additional sensors, analog inputs, and analog outputs
- Multiple language support allows simple setup
- Eight relay control outputs allow the controller to be used in more applications
- Economical wall-mount package for easy installation
- On-screen and web page graphing of sensor values and control output status
- Complete function of each relay
- ON/OFF set point
- Time proportional control
- Pulse proportional control (when purchased with 4-20 mA or pulse solid state opto outputs)
- PID control (when purchased with 4-20 mA or pulse solid state opto outputs)
- In-range or Out-of-range activation
- Probe wash
- Timer-based activation
- Activation based upon the state of a contact closure
- Timed activation triggered by water contactor/paddle wheel flow meter’s accumulated total flow
- Activate with another output
- Activate as a percent of another output’s ON-time
- Alarm
- Spike set point
- PPM Volume
- Target PPM
- For cooling tower and boiler applications:
- Biocide timer
- Boiler blow down on conductivity using intermittent sampling
- Ethernet for remote access via the Internet, LAN or optional Modbus/TCP
- Data logging
- Email alarm messages, data log reports or system summary reports
- Helps to maintain the levels of critical parameters such as pH, ORP, Fluorescein (PTSA), and conductivity precisely
- Universal sensor input provides extraordinary flexibility; the same controller can be used with almost any type of sensor needed
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