W900 Series Water Treatment Controllers
Enjoy unparalleled versatility and powerful programming for complete control of chemical metering pumps and valves in a broad range of water treatment applications.
Features:
- Powerful Control
- WiFi, BACnet, Graph Reports
- Flexible Programming
- Online Access
- Easy Setup
- Great Value
Benefits:
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Large touchscreen display with icon based programming makes setup easy
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Universal sensor input provides extraordinary flexibility; the same controller can be used with almost any type of sensor needed
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Four I/O slots allow complete flexibility in adding additional sensors, analog inputs and analog outputs
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Multiple language support allows simple setup
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Eight relay control outputs allow the controller to be used in more applications
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Economical wall-mount package for easy installation
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On-screen and web page graphing of sensor values and control output status
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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
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Ethernet for remote access via the Internet, LAN or optional Modbus/TCP
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Datalogging
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Email Alarm messages, Datalog reports or System Summary reports
Specifications:
Inputs
Power 100-240 VAC, 50 or 60 Hz, 13A max Fuse: 6.3 Amp
Sensor Input Signals (0-8 depending on model code)
Contacting Conductivity: 0.01, 0.1, 1.0, or 10.0 cell constant, or
Electrodeless Conductivity or
Disinfection or
Amplified pH, ORP, or Ion Selective Electrode which requires a preamplified signal. ±5VDC power available for external
preamps. Walchem WEL or WDS series pH/ORP sensors recommended.
Each sensor input card contains a temperature input.
Temperature: 100 or 1000 ohm RTD, 10K or 100K Thermistor
Analog (4-20 mA) Sensor Input (0-24 depending on model code) 2-wire loop powered and self-powered transmitters supported 3-wire and 4-wire transmitters supported All Channels fully isolated, input and power Channel 1, 130 ohm input resistance, Channel 2-6, 280 ohm input resistance Available Power: Isolated 24 VDC ±15% supply per channel. 1.5 W (62.5 mA maximum for each channel)
Digital Input Signals (12): State-Type Digital Inputs Electrical: Optically isolated and providing an electrically isolated 12V power with a nominal 2.5 mA current when the digital input switch is closed. Typical response time: < 2 seconds. Devices supported: Any isolated dry contact (i.e. relay, reed switch). Types: DI State
Low Speed Counter-Type Digital Inputs Electrical: Optically isolated and providing an electrically isolated 12V power with a nominal 2.5 mA current when the digital input switch is closed, 0-20 Hz, 25 msec minimum width. Devices supported: Any device with isolated open drain, open collector, transistor or reed switch. Types: Contacting Flowmeter
High Speed Counter-Type Digital Inputs Electrical: Optically isolated and providing an electrically isolated 12V power with a nominal 2.5 mA current when the digital input switch is closed, 0-500 Hz, 1.0 msec minimum width. Devices supported: Any device with isolated open drain, open collector, transistor or reed switch. Types: Paddlewheel Flowmeter
Outputs
Powered Mechanical Relays (0-8 model code dependent) Pre-powered on circuit board switching line voltage Four relays are fused together as one group, total current must not exceed 6.3A (resistive), 1/8 HP (93W)
Dry Contact Mechanical Relays (0-8 model code dependent) 6 A (resistive), 1/8 HP (93W) Dry contact relays are not fuse protected.
Pulse Outputs (0-4 model code dependent) Opto-isolated, solid-state relay, 200mA, 40V DC VLOWMAX = 0.05V @ 18mA
4 - 20 mA (0-16 model code dependent) Internally powered, 15VDC, Fully isolated 600 ohm max resistive load Resolution 0.0015% of span Accuracy ± 0.5% of reading
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