Pool Link 500 Series, Additional Sensor Flow Cell Module w/ Sensor Pushback

The Pool Link 500 Series Additional Sensor Flow Cell Module w/ Sensor Pushback (Pool Link / Link Automation) is a modular, bypass expansion flow block engineered to expand existing 500 Series multi-parameter flow cells without re-plumbing the entire analytical bypass loop.

Equipped with an integrated Sensor Pushback mechanism, this module allows operators to physically retract or push back delicate analytical sensors (such as amperometric chlorine or optical turbidity probes) from the high-velocity central flow stream into an isolated, sealed internal recess. This allows routine sensor inspection, zero-point calibration, cleaning, or chemical shock isolation without depressurizing the bypass loop or shutting down primary recirculation.

Hardware Architecture & Mechanical Engineering

Designed to integrate directly with existing Pool Link 500 Series manifolds in high-demand commercial aquatic facilities:

• Modular Solid-Block Expansion: Precision-machined from clear, chemical-resistant cast acrylic. It mounts either in-line via modular union blocks or plumbed as a dedicated satellite chamber downstream from the main 2-, 3-, or 4-probe manifold.

• Mechanical Pushback Gland Assembly: Features a threaded or slide-lock captive collar with dual Viton/EPDM O-ring piston seals. Turning the external pushback ring withdraws the probe tip back into an integrated bypass chamber pocket, shielding delicate diffusion membranes or optical lenses from high shear velocity, abrasive particulates, or transient high-concentration chemical slugs.

• Zero-Depressurization Isolation: When fully retracted into the pushback detent, internal sealing geometry isolates the probe tip from line pressure, allowing manual inspection or zero-calibration rinsing via an auxiliary purge port without draining the entire flow cell.

• Hydrodynamic Flow Profile: Bored with continuous internal transitions to prevent vortexing, air pocket entrapment, and stagnation zones that cause analytical delay.

• Integrated Air Bleed & Purge Port: Top-mounted 1/4" NPT port fitted with a manual bleed screw or petcock to purge trapped air bubbles before returning sensors to service.

Technical Specifications

• Sensor Compatibility: Sized for standard commercial 3/4" NPT, 1" NPT, or proprietary Pool Link 500 Series sensor gland bodies (compatible with Amperometric FAC/TAC probes, Nephelometric Turbidity sensors, or secondary conductivity/TDS cells).

• Hydraulic Operating Limits:

  • Maximum Working Pressure: 50 PSI (approx. 3.45 bar).

  • Recommended Bypass Flow Rate: 0.5 to 1.5 GPM (approx. 1.9 to 5.7 LPM).

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

• Plumbing Connections: Standard 1/4" NPT female inlet and outlet ports, pre-fitted with 3/8" OD compression fittings for semi-rigid polyethylene bypass tubing, or modular O-ring block tie-bolts for direct manifold ganging.

• Seals & Wetted Materials: Clear acrylic body, PVDF/delrin pushback sleeve, and high-grade Viton/FKM or EPDM elastomeric compression seals.

Pushback Operation & Servicing Steps

1. Retract Sensor (Pushback Mode): Rotate the external retention collar counter-clockwise to loosen tension, then draw the pushback sleeve outward until it hits the mechanical stop. Lock the collar into the retracted detent.

2. Inspect & Clean: With the sensor tip recessed, visually inspect the sensing surface through the polished acrylic block for bio-fouling, calcification, or trapped debris.

3. Purge Entrained Air: If the bypass loop was serviced, open the top bleed screw until a steady, bubble-free stream of water emerges, then finger-tighten the screw.

4. Deploy Sensor (Operating Mode): Unlock the collar and gently slide the pushback sleeve forward until the sensing face is positioned in the center of the active flow channel. Tighten the collar by hand until firmly seated against the O-ring stop.