{"product_id":"pool-link-500-series-clear-piston-flow-switch-pi","title":"Pool Link 500 Series, Clear Piston Flow Switch (PI)","description":"\u003cp data-path-to-node=\"0\" class=\"first-token\"\u003e\u003cspan class=\"\"\u003eThe \u003c\/span\u003e\u003cb data-path-to-node=\"0\" data-index-in-node=\"4\" class=\"\"\u003ePool Link 500 Series Clear Piston Flow Switch (PI)\u003c\/b\u003e\u003cspan class=\"\"\u003e (Pool Link \/ Link Automation) is a dedicated electro-mechanical safety interlock switch integrated directly into the acrylic bypass flow manifold of the Pool Link 500 and 501 Series commercial water chemistry automation controllers.\u003c\/span\u003e\u003cspan class=\"\"\u003e It combines a transparent sight chamber,\u003c\/span\u003e\u003cspan class=\"\"\u003e a free-floating magnetic piston (shuttle),\u003c\/span\u003e\u003cspan class=\"\"\u003e and an external photo-interrupter\/reed interlock mechanism (PI) to provide continuous visual confirmation of water movement while serving as the primary electrical fail-safe to lock out chemical feed outputs when bypass circulation stalls.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-path-to-node=\"2\"\u003eHardware Architecture \u0026amp; Operational Dynamics\u003c\/h3\u003e\n\u003cp data-path-to-node=\"3\"\u003e\u003cspan\u003eEngineered to prevent chemical deadheading and dry-firing in commercial swimming pools,\u003c\/span\u003e\u003cspan\u003e spas,\u003c\/span\u003e\u003cspan\u003e and natatoriums:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"4\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,0,0\"\u003e\u003cb data-path-to-node=\"4,0,0\" data-index-in-node=\"0\"\u003eClear Optical Sight Cylinder:\u003c\/b\u003e\u003cspan class=\"\"\u003e Precision-machined from cast optical-grade acrylic or heavy-wall polycarbonate.\u003c\/span\u003e\u003cspan\u003e It provides 360° visibility of the internal piston chamber,\u003c\/span\u003e\u003cspan\u003e allowing maintenance technicians to visually confirm flow dynamics,\u003c\/span\u003e\u003cspan\u003e entrained air bubbles,\u003c\/span\u003e\u003cspan\u003e or bio-scaling without taking the bypass loop off-line.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,1,0\"\u003e\u003cb data-path-to-node=\"4,1,0\" data-index-in-node=\"0\"\u003eWeighted Magnetic Piston \/ Shuttle:\u003c\/b\u003e\u003cspan\u003e Houses a lightweight,\u003c\/span\u003e\u003cspan\u003e chemical-resistant polymer piston embedded with a permanent ceramic\/alnico magnet.\u003c\/span\u003e\u003cspan class=\"\"\u003e Water entering the bottom of the vertical chamber drives the piston upward against gravity and fluid drag.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,2,0\"\u003e\u003cb data-path-to-node=\"4,2,0\" data-index-in-node=\"0\"\u003ePI Interlock Module:\u003c\/b\u003e\u003cspan class=\"\"\u003e An externally mounted sensor block—configured with a magnetic reed capsule or a solid-state optoelectronic\/photo-interrupter (PI) pickup—detects the elevated position of the piston.\u003c\/span\u003e\u003cspan\u003e When flow drops below minimum operating velocity,\u003c\/span\u003e\u003cspan\u003e gravity returns the piston to the bottom seat,\u003c\/span\u003e\u003cspan\u003e breaking the circuit and triggering an immediate controller interlock.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,3,0\"\u003e\u003cb data-path-to-node=\"4,3,0\" data-index-in-node=\"0\"\u003eNon-Binding Internal Geometry:\u003c\/b\u003e\u003cspan\u003e Features longitudinal bypass grooves or a tapered bore to allow fluid flow around the perimeter of the piston.\u003c\/span\u003e\u003cspan\u003e This prevents hydraulic lockup and reduces sticking caused by hair,\u003c\/span\u003e\u003cspan\u003e lint,\u003c\/span\u003e\u003cspan\u003e or particulate accumulation.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,4,0\"\u003e\u003cb data-path-to-node=\"4,4,0\" data-index-in-node=\"0\"\u003eChemical-Grade Materials:\u003c\/b\u003e\u003cspan\u003e Wetted components consist of optical acrylic,\u003c\/span\u003e\u003cspan\u003e PVDF\/Delrin piston polymers,\u003c\/span\u003e\u003cspan\u003e and Viton (FKM) elastomeric O-rings,\u003c\/span\u003e\u003cspan\u003e ensuring long-term resistance to liquid chlorine,\u003c\/span\u003e\u003cspan\u003e muriatic acid,\u003c\/span\u003e\u003cspan\u003e cyanuric acid,\u003c\/span\u003e\u003cspan\u003e and ozone off-gas.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-path-to-node=\"6\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul data-path-to-node=\"7\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,0,0\"\u003e\u003cb data-path-to-node=\"7,0,0\" data-index-in-node=\"0\"\u003eCompatible Controllers:\u003c\/b\u003e\u003cspan\u003e Pool Link 501,\u003c\/span\u003e\u003cspan\u003e Pool Link 500 Series,\u003c\/span\u003e\u003cspan\u003e and Link Automation commercial chemical controllers.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,1,0\"\u003e\u003cb data-path-to-node=\"7,1,0\" data-index-in-node=\"0\"\u003eElectrical Contact Configuration:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"7,1,1\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,1,1,0,0\"\u003e\u003cspan\u003eForm A SPST dry contact (Normally Open - NO; closes upon verified flow).\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,1,1,1,0\"\u003e\u003cspan\u003eMax voltage\/current rating:\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cb data-path-to-node=\"7,1,1,1,0\" data-index-in-node=\"28\"\u003e24V AC\/DC, 0.5A\u003c\/b\u003e\u003cspan\u003e inductive\/resistive load.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,1,1,2,0\"\u003e\u003cspan\u003eDirect 2-wire or 3-wire low-voltage interface to the controller motherboard's \u003c\/span\u003e\u003ccode data-path-to-node=\"7,1,1,2,0\" data-index-in-node=\"78\"\u003eFLOW\u003c\/code\u003e\u003cspan\u003e terminal strip.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,2,0\"\u003e\u003cb data-path-to-node=\"7,2,0\" data-index-in-node=\"0\"\u003eHydraulic Actuation Thresholds:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"7,2,1\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,2,1,0,0\"\u003e\u003cb data-path-to-node=\"7,2,1,0,0\" data-index-in-node=\"0\"\u003eCut-In (Flow Verified \/ Contact Closes):\u003c\/b\u003e\u003cspan\u003e Typically \u003c\/span\u003e\u003cb data-path-to-node=\"7,2,1,0,0\" data-index-in-node=\"51\"\u003e0.40 to 0.60 GPM\u003c\/b\u003e\u003cspan\u003e (approx.\u003c\/span\u003e\u003cspan\u003e 1.\u003c\/span\u003e\u003cspan\u003e5 to 2.\u003c\/span\u003e\u003cspan\u003e3 LPM).\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,2,1,1,0\"\u003e\u003cb data-path-to-node=\"7,2,1,1,0\" data-index-in-node=\"0\"\u003eCut-Out (No Flow \/ Contact Opens):\u003c\/b\u003e\u003cspan\u003e Drops out below \u003c\/span\u003e\u003cb data-path-to-node=\"7,2,1,1,0\" data-index-in-node=\"51\"\u003e0.25 to 0.35 GPM\u003c\/b\u003e\u003cspan\u003e (approx.\u003c\/span\u003e\u003cspan\u003e 0.\u003c\/span\u003e\u003cspan\u003e95 to 1.\u003c\/span\u003e\u003cspan\u003e3 LPM).\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,3,0\"\u003e\u003cb data-path-to-node=\"7,3,0\" data-index-in-node=\"0\"\u003eMaximum Hydraulic Working Pressure:\u003c\/b\u003e\u003cspan\u003e \u003c\/span\u003e\u003cb data-path-to-node=\"7,3,0\" data-index-in-node=\"36\"\u003e50 PSI\u003c\/b\u003e\u003cspan\u003e (approx.\u003c\/span\u003e\u003cspan\u003e 3.\u003c\/span\u003e\u003cspan\u003e45 bar),\u003c\/span\u003e\u003cspan\u003e matching standard 500 Series acrylic chamber ratings.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,4,0\"\u003e\u003cb data-path-to-node=\"7,4,0\" data-index-in-node=\"0\"\u003eOperating Water Temperature:\u003c\/b\u003e\u003cspan\u003e 32°F to 120°F (0°C to 49°C).\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,5,0\"\u003e\u003cb data-path-to-node=\"7,5,0\" data-index-in-node=\"0\"\u003eProcess Fitting Connections:\u003c\/b\u003e\u003cspan\u003e Standard 1\/4\" NPT or 1\/2\" NPT female inlet and outlet ports (or integrated into the 500 Series acrylic manifold block with 3\/8\" OD compression tubing fittings).\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,6,0\"\u003e\u003cb data-path-to-node=\"7,6,0\" data-index-in-node=\"0\"\u003eCable Lead:\u003c\/b\u003e\u003cspan\u003e Standard \u003c\/span\u003e\u003cb data-path-to-node=\"7,6,0\" data-index-in-node=\"21\"\u003e10-foot\u003c\/b\u003e\u003cspan\u003e (approx.\u003c\/span\u003e\u003cspan\u003e 3.\u003c\/span\u003e\u003cspan\u003e0 m) factory-jacketed 2-conductor or shielded instrumentation pigtail.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-path-to-node=\"9\"\u003eInstallation \u0026amp; Alignment Guidelines\u003c\/h3\u003e\n\u003cul data-path-to-node=\"10\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"10,0,0\"\u003e\u003cb data-path-to-node=\"10,0,0\" data-index-in-node=\"0\"\u003eMandatory Vertical Orientation:\u003c\/b\u003e\u003cspan\u003e Because the clear piston relies on gravity-assisted return,\u003c\/span\u003e\u003cspan\u003e the switch \u003c\/span\u003e\u003cb data-path-to-node=\"10,0,0\" data-index-in-node=\"103\"\u003emust be installed vertically with flow moving upward\u003c\/b\u003e\u003cspan\u003e.\u003c\/span\u003e\u003cspan\u003e Installing horizontally or with downward flow prevents proper piston seating and creates a dangerous false \"Flow OK\" condition.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"10,1,0\"\u003e\u003cb data-path-to-node=\"10,1,0\" data-index-in-node=\"0\"\u003eAir Purging:\u003c\/b\u003e\u003cspan class=\"\"\u003e Trapped air bubbles at the top of the sight glass can cushion the piston or cause erratic chatter.\u003c\/span\u003e\u003cspan\u003e Use the manifold's top sample petcock or bleed valve to purge entrained air after initial line filling or filter backwashing.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"10,2,0\"\u003e\u003cb data-path-to-node=\"10,2,0\" data-index-in-node=\"0\"\u003eUpstream Debris Protection:\u003c\/b\u003e\u003cspan class=\"\"\u003e While more fouling-resistant than rotary paddle wheels,\u003c\/span\u003e\u003cspan\u003e fine calcification or debris can become trapped between the piston and the acrylic wall.\u003c\/span\u003e\u003cspan\u003e Ensure bypass water is drawn downstream of the facility's main filtration system.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-path-to-node=\"12\"\u003eMaintenance \u0026amp; Descaling Procedure\u003c\/h3\u003e\n\u003cul data-path-to-node=\"13\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"13,0,0\"\u003e\u003cb data-path-to-node=\"13,0,0\" data-index-in-node=\"0\"\u003eVisual Inspection:\u003c\/b\u003e\u003cspan\u003e If the controller displays a persistent \"NO FLOW\" warning while the main recirculation pump is running,\u003c\/span\u003e\u003cspan\u003e inspect the clear chamber.\u003c\/span\u003e\u003cspan\u003e If the piston is resting at the bottom despite active water flow,\u003c\/span\u003e\u003cspan\u003e it is fouled with calcium scale or debris.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"13,1,0\"\u003e\u003cb data-path-to-node=\"13,1,0\" data-index-in-node=\"0\"\u003eDescaling:\u003c\/b\u003e\u003cspan\u003e Isolate the bypass loop using the inlet and outlet needle valves.\u003c\/span\u003e\u003cspan class=\"\"\u003e Unthread the piston chamber barrel,\u003c\/span\u003e\u003cspan\u003e remove the internal piston,\u003c\/span\u003e\u003cspan\u003e and soak both in a 5% to 10% muriatic acid solution or white vinegar for 5 to 10 minutes until bubbling ceases.\u003c\/span\u003e\u003cspan\u003e Rinse thoroughly with fresh water and reassemble.\u003c\/span\u003e\u003cspan\u003e Never scrape the acrylic bore with metallic tools or abrasive scouring pads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"attachment-container unknown md-has-block-component\"\u003e\n\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003csequence class=\"lm-enabled ng-star-inserted\"\u003e\u003cdiv role=\"list\" class=\"sequence-container\" jslog=\"308913;track:impression,attention\" data-hveid=\"0\" decode-data-ved=\"1\" data-ved=\"0CAAQse0SahgKEwjHxM7M582XAxUAAAAAHQAAAAAQhgU\"\u003e\n\u003cdiv role=\"listitem\" class=\"sequence-event ng-star-inserted\"\u003e\u003cdiv class=\"sequence-event-content\"\u003e\u003cdiv class=\"sequence-event-description gds-body-l\"\u003e\n\u003cspan only-show-to-message-actions=\"\" data-test-id=\"sequence-export-header\" class=\"only-show-to-message-actions\"\u003e\u003cstrong\u003e\u003c!----\u003e\u003c!----\u003e1.\u003c!----\u003e\u003c!----\u003eDe-energize Controller and Isolate Flow:\u003c!----\u003e\u003c\/strong\u003eSafety Prerequisite.\u003c!----\u003e\u003c!----\u003e\u003c\/span\u003e\u003cstructured-node-sequence _nghost-ng-c1241692568=\"\" class=\"ng-star-inserted\"\u003e\u003cstructured-text _ngcontent-ng-c1241692568=\"\" class=\"ng-star-inserted\"\u003e\u003c!----\u003e\u003c!----\u003e\u003cp class=\"ng-star-inserted\"\u003eDisconnect main AC power to the legacy 1000 Series controller enclosure. Close the bypass supply and return isolation valves to relieve hydraulic pressure in the probe manifold.\u003c\/p\u003e\n\u003cp class=\"ng-star-inserted\"\u003e\u003ci\u003eVerification:\u003c\/i\u003e Pressure gauge on the manifold reads 0 PSI and the controller display is unpowered.\u003c\/p\u003e\n\u003c!----\u003e\u003c!----\u003e\u003c\/structured-text\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/structured-node-sequence\u003e\u003c!----\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv role=\"listitem\" class=\"sequence-event ng-star-inserted\"\u003e\u003cdiv class=\"sequence-event-content\"\u003e\u003cdiv class=\"sequence-event-description gds-body-l\"\u003e\n\u003cspan only-show-to-message-actions=\"\" data-test-id=\"sequence-export-header\" class=\"only-show-to-message-actions\"\u003e\u003cstrong\u003e\u003c!----\u003e\u003c!----\u003e2.\u003c!----\u003e\u003c!----\u003eRemove the Existing Temperature Sensor:\u003c!----\u003e\u003c\/strong\u003e5 min.\u003c!----\u003e\u003c!----\u003e\u003c\/span\u003e\u003cstructured-node-sequence _nghost-ng-c1241692568=\"\" class=\"ng-star-inserted\"\u003e\u003cstructured-text _ngcontent-ng-c1241692568=\"\" class=\"ng-star-inserted\"\u003e\u003c!----\u003e\u003c!----\u003e\u003cp class=\"ng-star-inserted\"\u003eDisconnect the two temperature sensor wires from the controller's mainboard terminal strip (noting polarity\/terminal designations). Unscrew the sensor probe from the acrylic manifold port counter-clockwise using an open-end wrench.\u003c\/p\u003e\n\u003cp class=\"ng-star-inserted\"\u003e\u003ci\u003eVerification:\u003c\/i\u003e Port threads are clean and free of remnants from old Teflon tape or cracked plastic.\u003c\/p\u003e\n\u003c!----\u003e\u003c!----\u003e\u003c\/structured-text\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/structured-node-sequence\u003e\u003c!----\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv role=\"listitem\" class=\"sequence-event ng-star-inserted\"\u003e\u003cdiv class=\"sequence-event-content\"\u003e\u003cdiv class=\"sequence-event-description gds-body-l\"\u003e\n\u003cspan only-show-to-message-actions=\"\" data-test-id=\"sequence-export-header\" class=\"only-show-to-message-actions\"\u003e\u003cstrong\u003e\u003c!----\u003e\u003c!----\u003e3.\u003c!----\u003e\u003c!----\u003eInstall and Wire Replacement Probe:\u003c!----\u003e\u003c\/strong\u003e5 min.\u003c!----\u003e\u003c!----\u003e\u003c\/span\u003e\u003cstructured-node-sequence _nghost-ng-c1241692568=\"\" class=\"ng-star-inserted\"\u003e\u003cstructured-text _ngcontent-ng-c1241692568=\"\" class=\"ng-star-inserted\"\u003e\u003c!----\u003e\u003c!----\u003e\u003cp class=\"ng-star-inserted\"\u003eApply 2 to 3 wraps of PTFE thread sealing tape to the new sensor's male NPT threads. Hand-tighten into the flow cell port and snug an additional 1 turn with a wrench. Route the cable into the low-voltage knock-out and secure the leads into the temperature terminals.\u003c\/p\u003e\n\u003cp class=\"ng-star-inserted\"\u003e\u003ci\u003eVerification:\u003c\/i\u003e Sensor is seated firmly without leaking under line pressure, and wire terminals are clamped tight.\u003c\/p\u003e\n\u003c!----\u003e\u003c!----\u003e\u003c\/structured-text\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/structured-node-sequence\u003e\u003c!----\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv role=\"listitem\" class=\"sequence-event ng-star-inserted\"\u003e\u003cdiv class=\"sequence-event-content\"\u003e\u003cdiv class=\"sequence-event-description gds-body-l\"\u003e\n\u003cspan only-show-to-message-actions=\"\" data-test-id=\"sequence-export-header\" class=\"only-show-to-message-actions\"\u003e\u003cstrong\u003e\u003c!----\u003e\u003c!----\u003e4.\u003c!----\u003e\u003c!----\u003ePower Up and Calibrate:\u003c!----\u003e\u003c\/strong\u003e3 min.\u003c!----\u003e\u003c!----\u003e\u003c\/span\u003e\u003cstructured-node-sequence _nghost-ng-c1241692568=\"\" class=\"ng-star-inserted\"\u003e\u003cstructured-text _ngcontent-ng-c1241692568=\"\" class=\"ng-star-inserted\"\u003e\u003c!----\u003e\u003c!----\u003e\u003cp class=\"ng-star-inserted\"\u003eRestore AC power to the controller and open bypass isolation valves. Compare the controller's displayed water temperature against an independent calibrated handheld thermometer or photometer reading taken at the petcock.\u003c\/p\u003e\n\u003cp class=\"ng-star-inserted\"\u003e\u003ci\u003eVerification:\u003c\/i\u003e Displayed temperature stabilizes and tracks within \u003cspan class=\"math-inline\" data-math=\"\\pm 1^\\circ\\text{F}\" data-index-in-node=\"286\"\u003e$\\pm 1^\\circ\\text{F}$\u003c\/span\u003e of the reference thermometer.\u003c\/p\u003e\u003c\/structured-text\u003e\u003c\/structured-node-sequence\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/sequence\u003e\n\u003c\/div\u003e","brand":"Commercial Pool and Spa Supplies","offers":[{"title":"Default Title","offer_id":67968932249711,"sku":"LINK-CPFS","price":600.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0678\/3785\/3807\/files\/mermade-filter-500-series-automatic-chemical-feed-controller-by-pool-link-474-474_d4279122-6b2c-41b3-b454-449be02908c2.jpg?v=1792681416","url":"https:\/\/commercialpoolandspasupplies.com\/products\/pool-link-500-series-clear-piston-flow-switch-pi","provider":"Commercial Pool and Spa Supplies ","version":"1.0","type":"link"}