WalchemControllers & Automation
Walchem W900 Series Multi-Parameter Controller
The flagship multi-parameter water controller supporting up to 8 sensor inputs, 12 relays, full graphing touchscreen, and Ethernet/Cellular cloud connectivity.
PARTNER: Walchem
INTEGRATION: C-Water Egypt
DOCUMENTS: 3 PDF
Engineering Overview
The Walchem W900 Series provides unmatched flexibility for cooling towers, boilers, wastewater neutralization, and municipal disinfection. Its modular I/O architecture allows combining electrodeless conductivity, differential pH/ORP, disinfection sensors, flowmeters, and 4-20mA inputs in a single weather-tight enclosure.
Target Applications:
•Cooling Tower Concentration Control & Biocide Cycling
•High-Pressure Boiler Surface Blowdown
•Industrial Dual-pH Neutralization
•Drinking Water Multi-Parameter Disinfection
Key Engineering Benefits:
Large icon-driven color touchscreen with live trending charts
Up to 8 direct digital/analog sensor inputs and 12 powered relays
Built-in Ethernet with Modbus TCP, BACnet, and Walchem Cloud IoT
Advanced control algorithms including feed-bleed interlocks and biocide timers
NEMA 4X / IP65 industrial washdown enclosure
Engineering Parameters
Technical Specifications
| Enclosure Rating | NEMA 4X / IP65 Polycarbonate |
| Sensor Inputs | Up to 8 (pH, ORP, Conductivity, Chlorine, Disinfection, 4-20mA) |
| Control Relays | Up to 12 electromechanical / solid state relays |
| Analog Outputs | Up to 16 isolated 4-20mA outputs |
| Communications | Ethernet, USB, Modbus TCP/RTU, BACnet, Cellular |
| Display | 5.7-inch Color Graphic Touchscreen (320 x 240) |