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

The Pool Link 501 Series - ORP/pH/Temp, No Flow Cell, No Remote Monitoring is a standalone, local-control automated water chemistry controller designed for commercial swimming pools, athletic spas, municipal plunge tanks, and institutional water features. Engineered for applications that require reliable on-site microprocessor dosing control without ongoing recurring cellular/cloud subscriptions or networked building automation telemetry, this package provides the core electronics console and analytical sensors for installation into an existing bypass sampling manifold.

System Overview & Package Components

Configured specifically for localized equipment room control and direct hardware retrofits:

• Pool Link 501 Local Digital Controller: Microprocessor-based digital automation unit featuring a high-contrast backlit LCD screen that displays real-time readings for pH, ORP (mV), and water temperature (°F/°C), alongside output feed states and active safety alarms.

• Non-Networked / Standalone Firmware Configuration: Operates entirely autonomously on-site without an internal cellular modem, Ethernet interface, or external Wi-Fi transceiver, eliminating network configuration issues, cyber vulnerabilities, and recurring data hosting fees.

• Commercial Combination pH Probe: Heavy-duty, sealed glass-body combination electrode featuring an internal reference chamber, porous junction, shielded low-noise coaxial lead, and water-resistant BNC connector.

• Commercial Platinum-Band ORP Probe: Rapid-response platinum sensor engineered for continuous millivolt monitoring across chlorinated or brominated commercial water systems.

• Precision Temperature Sensor: Solid-state temperature probe delivering continuous water temperature data for local monitoring and operational temperature tracking.

• Sensor Adapter Fittings: Threaded gland adapters (typically 1/2-inch or 3/4-inch NPT) for securing the probes into existing acrylic flow manifolds or sampling tee ports.

Technical Specifications

• Monitoring & Control Ranges:

  • 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 overshooting), and Manual override feed modes.

• Relay Outputs:

  • Dedicated chemical dosing relays for pH (acid/CO₂ or base) and ORP (liquid chlorine/bromine feed equipment or erosion solenoid), rated up to 5A at 115V/230V AC.

  • Local auxiliary/alarm dry-contact output for driving an external equipment room strobe, horn, or safety interlock.

• Safety & Interlock Features:

  • Independent programmable feed timeout clocks per chemical channel (cuts dosing if target values are not reached within a set interval).

  • High/Low parameter threshold safety alarms (audible buzzer and visual display indicators).

  • Dedicated digital dry-contact input terminals for an external magnetic flow switch or circulation pump interlock.

• Enclosure: NEMA 4X / IP66 weather-resistant, UV-stabilized thermoplastic housing with a clear, lockable hinged door to isolate sensitive electronics from ambient chemical fumes.

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

Operational Footprint & Installation Requirements

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

• Sensor Lead Lengths: Standard 10-foot (approx. 3.0 m) shielded cables with protective connector boots.

• Bypass Sampling Requirements: Requires connection to an existing commercial flow cell or inline bypass manifold plumbed across the main circulation pump loop (rated up to 50 PSI).

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