Hanna HI981412 GroLine pH Dosing System

Description

The Hanna HI981412 GroLine pH Dosing System is a compact, wall‑mounted pH controller equipped with a built‑in peristaltic dosing pump. Designed specifically for horticulture professionals, it enables growers to maintain ideal pH levels in soil and hydroponic nutrient solutions. Correct pH ensures macro and micro nutrients, calcium, and magnesium bloom boosters are absorbed efficiently through root systems. Utilizing the supplied HI10063 amplified pH/temperature probe, this system monitors solution pH and regulates acid or base dosing with precision. Its versatility supports standalone reservoir control or integration with other dosing units such as the HI981413 nutrient controller, making it highly adaptable for both small‑scale hydroponics and commercial horticulture facilities.

Advanced Peristaltic Pump Technology Minimizes Maintenance Needs

The integrated peristaltic pump relies on a stepper motor that operates without gears or brushes, reducing wear and extending lifespan. This design minimizes service intervals, ensuring reliable control with minimal downtime. The dosing pump supports both manual priming functions and fully automated control. Operators can choose between simple On/Off control or proportional dosing. Proportional control mode reduces overshooting and maintains stable pH around the defined set point. The flow rate is adjustable from 0.5 to 3.5 liters per hour (0.13 to 0.92 gallons per hour), providing flexibility to suit nutrient reservoir size and system turnover rates. This adjustability is critical for applications where fine dosing prevents nutrient imbalance or waste.

Multiple Alarm Functions for Operational Safety Assurance

Ensuring process safety, the HI981412 features configurable high and low pH alarms with enable/disable options. Alarms trigger within five seconds if consecutive readings exceed preset thresholds, causing the backlit LCD to turn red, the pump to stop, and the alarm relay to activate. Additional overtime protection prevents overfeeding by limiting pump operation to a set duration between 1 and 180 minutes or disabling entirely. The intuitive alarm system uses color‑coded backlighting: green for normal operation, yellow for warnings, and red for critical alerts. This visual coding improves situational awareness for operators in busy workspaces.

Flexible Probe Connection And Temperature Compensation

Connection reliability is improved with a Quick Connect DIN connector that creates a waterproof seal, eliminating connection issues in humid environments. The HI10063 probe integrates both pH and temperature sensing for automatic temperature compensation. This ensures readings are adjusted to account for thermal variations, improving dosing accuracy across the temperature range −5.0 to 105.0°C (23.0 to 221.0°F). The probe construction features a PVDF body with double junction reference and a cloth junction, enhancing chemical resistance and longevity. Installation options include threaded fittings for in‑line mounting or placement in a flow cell, supporting diverse system configurations.

External Level And Flow Inputs Integration Option

The HI981412 incorporates a digital level/flow sensor input, allowing connection to external switches for reagent level monitoring or pump flow detection. When integrated, these inputs disable pump dosing if chemical reserves are depleted or if system flow is interrupted. The galvanically isolated design prevents electrical interference between connected devices, safeguarding the controller’s measurement accuracy. This integration is particularly important in automated hydroponic setups, where continuous dosing without monitoring could result in pH drift, nutrient waste, or crop damage.

Applications In Modern Hydroponics And Soil Farming

In hydroponic farming, the HI981412 precisely maintains nutrient solution pH in recirculating or drain‑to‑waste systems, ensuring optimal nutrient uptake efficiency. In soil‑based agriculture, it can control fertigation water pH, preventing lock‑out effects in soils with fluctuating alkalinity. Indoor cultivation operations benefit from integration with climate and nutrient dosing systems, allowing comprehensive environmental control. Greenhouses, vertical farms, and research facilities use the HI981412 to standardize growing conditions for experimental or commercial production. With modular compatibility, it works seamlessly alongside additional controllers for electrical conductivity or nutrient ratio management.

Reliable Power Supply And Rugged Enclosure Design

The HI981412 operates on a wide 100–240 VAC power supply, making it suitable for global installations. Its IP65‑rated wall‑mounted casing resists dust and water ingress, protecting components in humid or splash‑prone environments. The controller is designed for an operating environment of 0–50°C (32–122°F) and up to 95% RH non‑condensing. At 90 × 142 × 80 mm dimensions and 910 g weight, it is compact yet robust enough for constant operation. These characteristics make it well‑suited to greenhouses, nutrient mixing rooms, and climate‑controlled grow spaces where environmental resilience is essential.

Authentic Global Availability Through tpt24.com Store

For growers and horticulturists worldwide, the HI981412 GroLine pH Dosing System is available through tpt24.com, the leading global online store for Hanna Instruments. Tpt24 guarantees authenticity and top‑tier quality, delivering products to any country with full manufacturer compliance. Whether for small hydroponic setups or large‑scale agricultural facilities, purchasing through tpt24.com ensures customers receive certified equipment with dependable after‑sales support. The platform’s worldwide delivery network enables timely procurement for projects of any scale, ensuring operational readiness without delays.