Pool Link 501 Series - ORP/pH/Temp/FAC PPM, Includes Flow Cell, No Remote Monitoring

The Pool Link 501 Series - ORP/pH/Temp/FAC PPM, Includes Flow Cell, No Remote Monitoring is a self-contained, localized commercial water chemistry automation system engineered for municipal natatoriums, institutional competition pools, resort waterparks, and athletic facilities. Combining precision amperometric Free Available Chlorine (FAC) parts-per-million sensing with standard ORP, pH, and temperature monitoring, this configuration operates as a standalone on-site controller—eliminating recurring cloud subscription fees, cellular data plans, and network vulnerabilities while supplying a complete, factory-machined acrylic bypass flow cell manifold assembly.

System Overview & Package Components

The package includes all analytical hardware, bypass flow hydraulics, safety interlocks, and local electronics required for immediate bypass installation:

• Pool Link 501 Local Digital Controller: Microprocessor-based digital control unit featuring an illuminated, multi-line LCD screen displaying simultaneous real-time readouts of FAC (PPM / mg/L), pH, ORP (mV), and water temperature (°F/°C), alongside output feed statuses and system alarms.

• Non-Networked / Standalone Firmware Configuration: Configured strictly for local on-site monitoring and adjustment without internal Wi-Fi, Ethernet, or cellular modems, ensuring data isolation and zero network dependencies.

• Machined Acrylic Flow Cell Manifold: Clear, solid-block acrylic flow cell designed to provide stable hydraulic conditions for all four probes. Features an integrated sample stream flow-regulating needle valve, a sample petcock for manual photometer/colorimeter calibration sampling, and a rotary paddle flow indicator.

• Integrated Magnetic Safety Flow Switch: Integrated reed switch that immediately interrupts all chemical feed relay outputs if sample bypass velocity drops below operational limits, preventing hazardous gas accumulation and chemical overfeeding.

• Amperometric Free Available Chlorine (FAC) Sensor: Precision membrane-covered or direct-exposure amperometric probe delivering continuous, direct PPM chlorine concentration readings independent of fluctuations in cyanuric acid or pH.

• Commercial Combination pH Sensor: Sealed glass-body combination electrode with an internal reference chamber, porous junction, shielded low-noise coaxial lead, and protective BNC boot.

• Commercial Platinum ORP Sensor: Rapid-response platinum-band electrode engineered for continuous oxidation-reduction potential monitoring across chlorinated or brominated water systems.

• Electronic Temperature Sensor: Solid-state temperature probe for real-time thermal tracking and automated sensor compensation.

• Plumbing Bypass Hardware Kit: Includes 3/8" OD polyethylene tubing, shut-off valves, threaded compression adapters, and pipe-saddle/injection fittings.

Technical Specifications

• Monitoring & Control Ranges:

  • Free Available Chlorine (FAC): 0.00 to 10.00 PPM (mg/L) (resolution: 0.01 PPM)

  • pH Range: 0.00 to 14.00 pH (operational control band: 7.00 to 8.00; resolution: 0.01 pH)

  • ORP Range: 0 to 1,000 mV (resolution: 1 mV)

  • Temperature Range: 32°F to 120°F (0°C to 49°C)

• Control Modes: Continuous (On/Off), Proportional (pulse-frequency or time-proportional modulation to prevent setpoint overshooting), and Manual feed override.

• Sanitizer Feed Prioritization: User-selectable control logic: primary direct FAC PPM dosing with ORP backup/override, or primary ORP dosing with FAC PPM data logging.

• Relay Outputs:

  • Dedicated powered/dry-contact feed relays for pH (acid/CO₂ or caustic) and Sanitizer (liquid hypochlorite metering pumps, erosion solenoids, or gas chlorination systems), rated up to 5A at 115V/230V AC.

  • Programmable auxiliary relay (configurable for UV system interlock, secondary oxidizer, or local external audible alarm).

  • System fault/alarm dry-contact relay for integration with a local alarm beacon or physical building automation panel.

• Safety & Interlock Features:

  • Independent programmable feed timeout timers per chemical channel (disables feed if target setpoint is not achieved within an allotted time).

  • High/low threshold visual and audible alarms for all monitored parameters.

  • Hardwired flow switch interlock for instantaneous output disconnect upon loss of water flow.

• Enclosure: NEMA 4X / IP66 weather-resistant, UV-stabilized thermoplastic housing with a clear, lockable hinged door to isolate components from corrosive equipment room vapors.

• Electrical Requirements: Universal 115V / 230V AC, 50/60 Hz, single phase.

Operational Footprint & Installation Requirements

• Controller Enclosure Dimensions: Approximately 11.0" H × 9.0" W × 5.5" D (approx. 27.9 cm × 22.9 cm × 14.0 cm).

• Flow Cell Assembly Dimensions: Approximately 12.0" H × 7.5" W × 4.5" D (approx. 30.5 cm × 19.1 cm × 11.4 cm).

• Sample Stream Plumbing: 3/8" OD flexible polyethylene tubing tapped across the primary pool filtration recirculation loop (pressure side of filter to pump suction or waste return).

• Maximum Flow Cell Operating Pressure: Rated up to 50 PSI (approx. 3.45 bar).

• Operating Ambient Conditions: 32°F to 122°F (0°C to 50°C), up to 95% non-condensing relative humidity.