WCT900 | W900 - Cooling Tower - Conductivity Controller

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