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