Walchem W600 Specifications

Conductivity, pH/ORP & Disinfection

W600 Series Controllers

The W600 series provides reliable, flexible and
powerful control for your water treatment program.

Summary of Key Benets

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
Combination Sensor Input and Analog Input board that add even more flexibility
Lead/Lag control of up to 6 relays
Optional dual analog (4-20 mA) input for Fluorometers or nearly any other process value
Multiple language support allows simple setup no matter where your business takes you
Six 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
Two Virtual Inputs that are calculated from two real inputs (cycles of concentration, % rejection, etc.)
The W600 with amperometric chlorine sensors can be used for reporting chlorine residual measurements in

accordance with EPA Method 334.0.
Complete flexibility in the function of each relay

• On/Off Setpoint

• Time Proportional Control

• Proportional Control (when purchased with 4-20mA or pulse solid state opto outputs)

• PID Control (when purchased with 4-20mA 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 a Water Contactor or 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

• For Cooling Tower and Boiler applications:

• Biocide Timer

• Boiler blowdown on conductivity using intermittent sampling

Datalogging
Emailing Alarm messages, Datalog, Graph, or System Summary reports
Ethernet option for remote access via the Internet, LAN or Modbus/TCP

Specifications

HP pH/ORP/Steel

Inputs

Power

100-240 VAC, 50 or 60 Hz, 7A max Fuse: 6.3 Amp

Sensor Input Signals (0, 1 or 2 depending on model code)

Contacting Conductivity: 0.01, 0.1, 1.0, or 10.0 cell constant, or
Electrodeless Conductivity (not available on the combination sensor/analog input card) 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, 1, 2 or 4 depending on model code)

2-wire loop powered and self-powered transmitters supported
3-wire and 4-wire transmitters supported
Each dual sensor input board has two channels: Channel 1, 130 ohm input resistance and Channel 2, 280 ohm input resis­tance. The combination input board has one channel, 280 ohm input resistance.
Available Power: One independent isolated 24 VDC ±15% supply per channel. 1.5 W maximum for each channel.
2W (83 mA at 24 VDC) total power consumption for all channels (four total channels possible if two dual boards are
installed; 2W is equivalent to 2 Little Dipper sensors)

Digital Input Signals (6):

State-Type Digital Inputs

Electrical: Optically isolated and providing an electrically isolated 9V power with a nominal 2.3mA 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: Interlock

Low Speed Counter-Type Digital Inputs

Electrical: Optically isolated and providing an electrically isolated 9V power with a nominal 2.3mA current when the

digital input switch is closed, 0-10 Hz, 50 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 9V power with a nominal 2.3mA current when the

digital input switch is closed, 0-500 Hz, 1.00 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 or 6 model code dependent)

Pre-powered on circuit board switching line voltage

All relays are fused together as one group, total current must not exceed 6A (resistive), 1/8 HP (93W)

Dry Contact Mechanical Relays (0, 2 or 4 model code dependent)

6 A (resistive), 1/8 HP (93W)

Dry contact relays are not fuse protected.

Pulse Outputs (0, 2 or 4 model code dependent)

Opto-isolated, solid-state relay, 200mA, 40V DC

VLOWMAX = 0.05V @ 18mA

4 - 20 mA (0 or 2 model code dependent)

Internally powered, Fully isolated

600 Ohm max resistive load, Resolution 0.0015% of span

Accuracy ± 0.5% of reading