{"product_id":"hanna-groline-ph-dosing-system-hi981412","title":"Hanna GroLine Automatic pH Dosing System HI981412","description":"\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe Hanna GroLine pH Dosing System HI981412 provides continuous pH monitoring and automatic pH adjustment for hydroponic reservoirs, greenhouse irrigation systems, fertigation tanks, and other recirculating nutrient solutions. By combining a pH controller, temperature-compensated process probe, and adjustable peristaltic dosing pump in one wall-mounted system, it helps growers maintain a more stable root-zone environment with less manual intervention.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe HI981412 can be configured to dose either an acid to lower pH or a base to raise pH. Adjustable control settings, color-coded alarms, low-level or flow-switch inputs, and programmable overtime protection help reduce the risk of excessive dosing.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eKey Benefits\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eContinuous pH monitoring:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Measures the solution around the clock instead of relying exclusively on periodic handheld tests.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eAutomatic pH correction:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Activates the built-in dosing pump when the measured pH moves beyond the programmed control point.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eAdjustable dosing rate:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e The peristaltic pump delivers approximately 0.5 to 3.5 liters per hour.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eProportional or on\/off control:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Choose the dosing behavior that best matches the reservoir volume, circulation rate, and strength of the pH-adjusting solution.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eTemperature compensation:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e The included probe measures temperature so pH readings can be compensated automatically.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eIntegrated safety functions:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Overtime protection, external level or flow-switch inputs, programmable alarms, and visual status indicators help growers identify problems quickly.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eProcess-ready probe:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e The amplified probe helps reduce interference from nearby pumps, motors, and other electrical equipment.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eWeather-resistant enclosure:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e The IP65 wall-mounted controller is designed for demanding greenhouse and indoor growing environments.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eHow Automatic pH Dosing Works\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe HI981412 continuously compares the measured pH with the grower’s programmed setpoint. When the pH moves outside the selected control range, the system activates its peristaltic pump and adds pH-adjusting solution.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eConfigure the system for the chemical being used:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eUse an appropriate acid or pH Down solution when the system is configured to lower pH.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eUse an appropriate base or pH Up solution when the system is configured to raise pH.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDo not connect the wrong chemical for the selected dosing direction.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThis is a single-channel dosing system and should be connected to only one pH-adjusting solution at a time.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eConsistent circulation is essential. The reservoir should remain well mixed during measurement and dosing so the probe detects a representative sample and concentrated adjuster does not collect in one location.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eMeasurement Specifications\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eController pH range:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 0.00 to 14.00 pH\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eProbe pH range:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 0 to 12 pH\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003epH resolution:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 0.01 pH\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003epH accuracy:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ±0.10 pH at 25°C\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eProbe temperature range:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e -5 to 70°C \/ 23 to 158°F\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eTemperature resolution:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 0.1°C \/ 0.1°F\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eTemperature accuracy:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ±0.5°C \/ ±0.9°F\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eTemperature compensation:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Automatic\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eDosing and Control Specifications\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003ePump type:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Integrated peristaltic pump\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eAdjustable flow rate:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 0.5 to 3.5 L\/hour\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eMaximum pump pressure:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 1 bar \/ 14 psi\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eControl direction:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e High or low pH control\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eControl modes:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Proportional or on\/off\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eSetpoint range:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 4.00 to 10.00 pH\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eOn\/off hysteresis:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Adjustable from 0.10 to 1.00 pH\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eProportional control band:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Adjustable from 0.10 to 2.00 pH\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eStartup delay:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Adjustable from 0 to 600 seconds\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eOvertime protection:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Adjustable from 1 to 180 minutes or disabled\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eManual priming:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Allows the dosing line to be filled during installation and maintenance\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eHI10063 Process Probe\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe included HI10063 is an amplified pH and temperature probe designed for continuous process monitoring. Its built-in amplification helps protect the measurement signal from electrical noise produced by pumps, grow-light ballasts, and other nearby equipment.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eProbe features include:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eIntegrated pH and temperature measurement\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDouble-junction reference design\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eReplaceable cloth junction\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eChemical-resistant PVDF body\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eMatching pin for improved measurement stability\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eQuick Connect DIN connection with a waterproof seal\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e3\/4-inch NPT upper thread for reservoir installation\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e1\/2-inch NPT lower thread for inline mounting\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eApproximately 2-meter probe cable\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eFor accurate readings, install the probe where it will receive steady circulation without being exposed to trapped air, concentrated pH adjuster, or excessive turbulence.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eDisplay, Alarms and Protection\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe multi-colored LCD provides an immediate indication of system status:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eGreen:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Normal measurement or control conditions\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eYellow:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Attention or setup condition\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eRed:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Active alarm condition\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eProgrammable high and low pH alarms alert the grower when the solution moves outside the desired range. The controller also accepts an external level or flow-switch signal, allowing it to stop dosing when the chemical container is empty or when adequate solution flow is not detected.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eOvertime protection limits how long the pump can operate continuously. This provides an additional safeguard if the pH does not respond as expected, although it should not replace routine inspection of the reservoir and dosing equipment.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eCalibration Options\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe HI981412 supports automatic one- or two-point calibration using recognized pH standards:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003epH 4.01\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003epH 7.01\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003epH 10.01\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eA two-point calibration using pH 7.01 and the buffer closest to the working range generally provides the best accuracy. The controller also supports a single-point process adjustment of up to ±0.50 pH around the measured value.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eAlways use fresh calibration buffer, rinse the probe between solutions, and never pour used buffer back into its original container.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eInstallation Options\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe HI981412 is available in configurations suited to different system layouts:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eController and probe configuration:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Intended for growers who will supply their own mounting hardware, dosing fittings, and tubing.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eInline installation configuration:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Adds components for installing the probe and chemical injector in a recirculation pipe.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eFlow-cell installation configuration:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Adds a flow cell and associated mounting components for routing a controlled sample past the probe.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003ePackage contents vary by the selected configuration. Review the chosen variant before ordering to confirm whether inline or flow-cell installation hardware is included.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eInstallation Recommendations\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eMount the controller vertically in a location protected from direct sunlight, vibration, and continuous dripping water.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eInstall the probe where it receives a representative, continuously circulating sample.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eKeep the chemical injection point downstream and an appropriate distance away from the probe.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDo not inject concentrated pH adjuster directly onto the probe.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eConfirm that all tubing, fittings, seals, and containers are compatible with the chemical being dosed.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eKeep the dosing container clearly labeled and secured against spills.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHave electrical wiring and permanent process connections completed by qualified personnel.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDisconnect power before servicing the pump, tubing, wiring, or probe.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eRoutine Maintenance\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eFor dependable automatic control:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eInspect the dosing tube regularly for wear, flattening, brittleness, or leaks.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCheck suction and injection lines for air bubbles, clogs, and loose fittings.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eClean the probe when readings become slow, unstable, or difficult to calibrate.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eStore and condition the pH electrode according to Hanna’s instructions.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eNever allow a pH electrode to dry out.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCalibrate regularly using fresh pH buffer.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eVerify the controller periodically with a separate, properly calibrated handheld meter.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCheck the chemical supply and external level or flow-switch operation.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eTest alarms and overtime protection before leaving the system unattended.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eImportant Safety Information\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003epH Up and pH Down products may be corrosive. Wear appropriate gloves and eye protection, follow the chemical manufacturer’s Safety Data Sheet, and provide suitable ventilation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eNever mix concentrated acid and base products together. Start with a conservative pump setting and a properly diluted adjusting solution when appropriate for the application. Closely observe the system during initial setup to confirm that the pH changes gradually without overshooting the setpoint.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe HI981412 controls pH only. It does not monitor electrical conductivity, TDS, or nutrient concentration. Growers who need automated nutrient-strength control can pair it with a separate Hanna GroLine EC\/TDS dosing controller.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv class=\"grid-x grid-padding-x grid-padding-y\"\u003e\n\u003cdiv class=\"cell small-12 large-auto\"\u003e\n\u003cdiv class=\"grid-x grid-padding-x grid-padding-y\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":41966318059684,"sku":"HI981412-10","price":530.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1298\/4199\/products\/Hanna_-GroLine-pH-Dosing-System-Hanna-Instruments-1670272326.jpg?v=1670272327","url":"https:\/\/www.gardensupplyguys.com\/products\/hanna-groline-ph-dosing-system-hi981412","provider":"GARDEN SUPPLY GUYS","version":"1.0","type":"link"}