BLU-Sentinel Pro Pool & Spa Chemistry Controller

Summary

Product identification

• Product Name: BLU-Sentinel Pro Pool & Spa Chemistry Controller
• Product Line: Wallace & Tiernan Analyzers - Controllers

Design and Function

The Blu-Sentinel Pro is a pool and spa water controller designed to optimize disinfection for safe bather experience. It measures pH, ORP, and free chlorine using Strantrol® sensing technology and an amperometric bare electrode. A hydro-mechanical cleaning process with circulating grit keeps the free chlorine electrode clean from lotions and oils.

The system comprises a flow cell module and an electronic module. The measurement module houses sensors, processes data, and transmits it to the electronics via a digital CAN bus cable. Optional sensor status indication uses red, yellow, and white LEDs.

Flow Cell Module

• Controlled Sample Water Flow: 33 l/h
• Flow Control Valve Inlet Pressure Range: 0.2 – 3.0 bar (3 – 43 psig)
• Maximum Back Pressure: Up to 1.5 bar (22 psig) at valve outlet
• Maximum Sample Water Temperature: 50 °C
• Multi-sensor:
  • Monitors sample water flow at 18 l/h ± 3 l/h (hysteresis: 2 l/h)
  • Measures sample water temperature via Pt 1000 sensor
• Sample Water Connections: PVC hose 6 x 3 mm or PE hose 6 x 1 mm
• Dimensions: 253 x 375 x 163 mm (8.5 x 15 x 6 inches)
• Weight: Approx. 2 kg (5.5 lbs)
• Voltage Supply: 24 V DC from the electronic module via CAN connection

Electronic Module

• Touchpanel: 7-inch graphic display with backlight, resistive touch screen, 800 x 480 Pixel resolution.
• Supported Sensors: CAN-Sensor interface for flow module, digital sensors (total/combined chlorine, conductivity).
• Analog Inputs: 1 x feed rate display.
• Digital Inputs: 3 x freely selectable.
• Output (relay) contacts: 8 freely assignable, expandable to 12. Max. 6A/250 V AC, 0.2 A/220 V DC.
• Analog Outputs (optional): 4 x 0/4 – 20 mA, galvanically isolated.
• Power Supply: 100 – 240 V ± 10% or 24 V DC, 50/60 Hz.
• Ambient Temperature: 0 – 50 °C (32 – 122 °F).
• Enclosure: IP 66.
• Dimensions: 320 x 311 x 153 mm (12.5” x 12” x 12.9”).
• Weight: Approx. 4.5 kg (10 lbs).

Sensors

• Free Chlorine:
  • Potentiostatic 3-electrode amperometric design.
  • Measuring Range: 0 to max 20 mg/l.
  • Resolution: Up to 10 mg/l: 0.01 mg/l; up to 20 mg/l: 0.1 mg/l.
  • Temperature Compensation: 0 – 50 °C.
  • Plug Connection: IP 67.
• Total Chlorine (optional):
  • Potentiostatic 3-electrode amperometric membrane design.
  • Measuring Range: 0 to max 20 mg/l.
  • Resolution: Up to 10 mg/l: 0.01 mg/l; up to 20 mg/l: 0.1 mg/l.
  • Temperature Compensation: 0 – 45 °C.
  • Plug Connection: IP 67.
  • Applicable for salt water pools with up to 4% salt concentration.
• Combined Chlorine (optional):
  • Calculated as the difference between total and free chlorine.
  • Displayed Range: 0 to max 20 mg/l.
  • Resolution: Up to 10 mg/l: 0.01 mg/l; up to 20 mg/l: 0.1 mg/l.
• pH Value:
  • Measuring Range: 0 to 14 pH.
  • Resolution: 0.01 pH.
  • Temperature Compensation: 0 – 50 °C.
  • Plug Connection: IP 67.
• ORP:
  • Measuring Range: 0 to 400 mV or 500 to 1000 mV.
  • Resolution: 1 mV.
  • Plug Connection: IP 67.
• Conductivity (optional):
  • Measuring Ranges: 10, 20, 50, 100 mS/cm.
  • Resolution: 0.1 mS/cm.
  • Switchable to NaCl display in mg/l and %.
  • Temperature Compensation: 0 – 50 °C.
• Temperature:
  • Measured by integral Pt 1000 sensor.
  • Measuring Range: 0 to 50 °C.
  • Resolution: 0.1 °C.

Operating Modes and Features

• CEDOX Control Mode: Free chlorine control within ORP brackets, aiming to use as little chlorine as possible but as much as necessary.
• DIN Contact: Digital output to circulation pump to reduce flow when parameters are within specified limits.
• Economic Mode: Optimized control parameters for reduced recirculation flow (e.g., lower chlorine setpoint).
• Super Chlorination: Automated process.
• Flocculation Control: Regulates flocculant dosing pump and adjusts to ECO operating mode.
• Combined/Total Chlorine Measurement: Optional sensor with control output.
• Conductivity Measurement: Optional, for maintaining constant salinity in salt water pools.
• Relay Outputs: 8 standard programmable relays, expandable to 12.
• Trend Diagrams: Available for all measured parameters.
• Data Management: External USB for data download, configuration upload/download, and firmware updates.
• Remote Access: Via Smartphone, tablet, or PC when connected to a local area network.
• Integral Safety Functions:
  • Safety shutdown for circulating pump failure, supply-tank-empty alarm, or sample water failure.
  • Feed time monitoring and delay.
  • Controller stop on sensor failure.
• Additional Integrated Controls:
  • Start-stop control of UV or activated carbon slurry feed systems.
  • Controlling salt concentration in salt water pools (with optional conductivity sensor).
• Adaption Mode: For initial commissioning to optimize chemical feed.
• Chemical Feed Rate Indication: Real-time rates displayed graphically; option to stop feed if thresholds are surpassed.

Communication Interfaces

• Local Area Network: Enables remote panel replication on smartphone, tablet, or PC.
• Field Bus Modules (optional): Supports Modbus TCP, Profinet I/O, or Profibus DP protocols.
• 0/4 – 20 mA Output (optional): For measurement data transfer of up to four variables.
• USB Connection: For data and configuration management, firmware updates.
• Process Monitoring System (optional): For monitoring multiple pools.

Disclaimer

This extraction may miss figures, footnotes, or revisions. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror