Overview
The Pall WS05DSB04 node box combines onboard display and capacitive water sensing in a single unit designed for in-line condition monitoring of petroleum and synthetic fluids in hydraulic, lubrication, and insulation oil applications. The WS05DSB04 is a node box with built-in display and probe with 1/4″ NPT connector. This compact system enables plant operators and maintenance technicians to monitor dissolved water content and temperature trends without requiring a separate external display or PC interface.
Key Features
- Circuitry on the sensor converts capacitance to voltage, amplifies it, and sends it to the WS05 node box for conversion to % saturation or ppm reading
- Up to 16 WS05 water sensors can be daisy-chained to provide a common data stream to a display or PC, with each node uniquely identified; power and data are carried along the serial cable between nodes
- The probe is directly immersed in the fluid to monitor dissolved water content and temperature
- RS232 serial and relay alarm output for local display or remote system integration
- Settable water and temperature alarms with relay contact for automated warning or shutdown logic
Technical Specifications
| Power Supply | 6–30 VDC |
| Operating Temperature | 0°F to 185°F (−18°C to 85°C) |
| Probe Material | Stainless Steel, 3/8″ O.D. |
| Probe Connector | 1/4″ NPT (male) |
| Probe Pressure Rating | 150 psi operating |
| Signal Output | RS232 serial and relay output |
| Probe Cable Length | 6 feet standard |
| Accuracy | ±2% (based on ASTM E104-85) |
| Enclosure Rating | IP 65 |
| Weight | 1 lb |
| Box Dimensions | 3.85″ × 3.85″ × 2.4″ |
| Compatible Fluids | Petroleum and synthetic oils, hydraulic, lubrication, insulation |
Typical Applications
The WS05DSB04 is ideal for condition monitoring and predictive maintenance in industrial equipment where water contamination poses risks to fluid performance and component life. Common applications include:
- Hydraulic system monitoring in manufacturing and mobile equipment
- Power transformer insulation oil condition assessment
- Industrial gear box and bearing lubrication systems
- Diesel fuel and light fuel storage tank surveillance
- Reciprocating compressor oil and synthetic refrigerant circuits
Compatibility & Replacements
Compatible With
- Up to 16 WS05 water sensors can be daisy-chained together for multi-point monitoring
- RS232 serial communication to external PC or PLC display terminals
- Pall WS05D external display unit for remote mounting
- Pall WS05P AC power supply input module (90–250 VAC, 24 VDC output)
- Industrial SCADA and predictive maintenance software platforms
Replaces / Drop-In Replacement For
- WS05DSB04 is a node box with built-in display as specified in Pall ordering documentation
- Legacy single-channel water sensor display units requiring onboard measurement and alarm functionality
- Verify compatibility with your system integrator before ordering to confirm RS232 protocol and relay output wiring requirements
Works With
- RS232 serial interface (standard Windows and Linux terminal software)
- Pall WS05 Series ecosystem (WS05SB node box, WS05D display, WS05P power supply)
- Industrial relay circuits and PLC input modules
- ASTM E104-85 water saturation calibration standards
