Walchem W900 Series controllers

Key Benefits:

1. Large touchscreen display with icon based programming makes setup easy
2. Universal sensor input provides extraordinary flexibility; the same controller can be used with almost any type of sensor needed
3. Four I/O slots allow complete flexibility in adding additional sensors, analog inputs and analog outputs
4. Multiple language support allows simple setup
5. Eight relay control outputs allow the controller to be used in more applications
6. Economical wall-mount package for easy installation
7. On-screen and web page graphing of sensor values and control output status
8. Complete function of each relay

• On/Off Setpoint
• Time Proportional Control
• Pulse Proportional Control (when purchased with 4-20 mA or pulse solid state opto outputs)
• Flow 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 / Paddlewheel 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 blowdown on conductivity using intermittent sampling

1. Ethernet for remote access via the Internet, LAN or optional Modbus/TCP
2. Datalogging
3. Email Alarm messages, Datalog reports or System Summary reports