Pool Link 501 Series - ORP/pH/Temp/FAC PPM, Includes Flow Cell

The Pool Link 501 Series - ORP/pH/Temp/FAC PPM, Includes Flow Cell is a commercial-grade, multi-parameter water chemistry automation system engineered for high-demand municipal natatoriums, resort waterparks, competition pools, and institutional aquatic facilities. In addition to electrochemical ORP (oxidation-reduction potential), pH, and water temperature monitoring, this package incorporates an amperometric Free Available Chlorine (FAC) sensor to deliver continuous, real-time parts-per-million (PPM) disinfectant readouts. Factory-bundled with a complete acrylic flow cell manifold assembly, it provides a full turnkey bypass monitoring station ready for direct integration into commercial circulation systems.

System Overview & Package Components

The complete package provides all primary sensing, analytical, flow-control, and safety components mounted on or connected via the included bypass assembly:

• Pool Link 501 Multi-Channel Digital Controller: Microprocessor-based control console featuring an illuminated, multi-line digital LCD display that simultaneously reports pH, ORP (mV), temperature (°F/°C), and direct Free Available Chlorine in PPM (mg/L), alongside active chemical feed states and alarm diagnostics.

• Machined Acrylic Flow Cell Assembly: Heavy-duty, transparent acrylic flow cell manifold engineered to house all analytical sensors under stable hydraulic conditions. Includes an integrated sample stream flow control valve, sample draw-off petcock for manual photometer/colorimeter calibration testing, and a visual rotary sample flow indicator.

• Integrated Safety Flow Switch: Magnetic reed safety switch integrated into the flow cell that automatically disables chemical feed outputs if sample line velocity drops below operating limits, eliminating chemical overfeeding or gas pocket accumulation.

• Amperometric Free Available Chlorine (FAC) Sensor: Precision membrane-covered or direct-exposure amperometric probe designed for continuous, selective measurement of free chlorine residual (PPM), independent of cyanuric acid shifts or pH fluctuations.

• Commercial Combination pH Electrode: Heavy-duty, sealed glass-body combination probe with an internal electrolyte 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 potential monitoring.

• Precision Electronic Temperature Sensor: Solid-state temperature probe delivering real-time thermal readings for operational display and automated compensation calculations.

• Plumbing & Installation Kit: Complete bypass tubing hardware, including 3/8" OD polyethylene sample lines, inline shutoff valves, compression connectors, and pipe-tap 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/time-proportional modulation to prevent chemical overshoot), and Manual feed override.

• Sanitizer Dosing Modes: Selectable primary control using direct FAC PPM setpoint with secondary ORP backup/override, or primary ORP with FAC PPM monitoring.

• Relay Outputs:

  • Dedicated chemical dosing relays for pH (acid/CO₂ or caustic) and Sanitizer (liquid sodium hypochlorite, calcium hypochlorite erosion solenoids, or gas chlorination systems), rated up to 5A at 115V/230V AC.

  • Programmable auxiliary relay (usable for secondary oxidizer, UV systems, or remote alarm beacons).

  • System fault/alarm dry-contact relay for building management systems (BMS).

• Safety & Interlock Features:

  • Independent programmable feed timeout limiters per chemical channel.

  • High and low threshold visual/audible alarms for pH, ORP, FAC PPM, and temperature.

  • Built-in flow cell switch interlock terminal for instantaneous chemical feed shutdown upon loss of flow.

• Enclosure: NEMA 4X / IP66 weather-resistant, UV-stabilized thermoplastic housing with a clear, lockable hinged door.

• 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 Footprint: 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 tubing plumbed across the main pool circulation system (pressure side of filter to suction side or atmospheric drain).

• 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.