Hanna HI981412-00 GroLine pH dosing system

Hanna HI981412-00 GroLine pH dosing system

The Hanna HI981412-00 GroLine pH dosing system is a highly reliable and easy-to-integrate solution for automated pH control in agricultural and hydroponic systems. Designed with precision, safety, and flexibility in mind, this controller continuously monitors pH levels and manages the dosing pump to adjust pH by injecting acid or base solutions.

Equipped with proportional or on/off control modes, automatic temperature compensation, and comprehensive alarm systems, the HI981412-00 offers growers and water treatment managers peace of mind and consistent nutrient availability.

Features

• Wide Measurement Range
  Monitors pH from 0.00 to 14.00 and temperature from -5.0 to 105.0°C (23.0 to 221.0°F).

• High Accuracy and Resolution
  Provides accurate readings within ±0.10 pH and ±0.5°C, with a resolution of 0.01 pH and 0.1°C.

• Automatic Temperature Compensation (ATC)
  Ensures stable readings regardless of environmental temperature fluctuations.

• User and Process Calibration

  • Automatic calibration at one or two points using standard buffers (pH 4.01, 7.01, 10.01)

  • Process calibration allows a ±0.50 pH adjustment around the measured value for field tuning

• Dual Dosing Control Modes

  • On/Off Control: Set point adjustable from 4.00 to 10.00 pH with hysteresis (0.10 to 1.00 pH)

  • Proportional Control: Adjustable proportional band (0.10 to 2.00 pH) for gradual dosing

• Startup and Dosing Protection Features

  • Startup delay (0 to 600 seconds)

  • Overtime dosing protection (1 to 180 minutes or Off)

• Flexible Pump Operation

  • Flow rate adjustable between 0.5 to 3.5 L/h (0.13 to 0.92 G/h)

  • Maximum output pressure: 1 atm (14 psi)

  • Manual priming function included

• Integrated Alarm System

  • Visual alerts using red, yellow, and green backlit display

  • High/low pH alarms, level detection, and consecutive reading triggers

  • Configurable alarm relay output (SPDT, 2.5A / 230 VAC)

• External Event Input
  Galvanically isolated input for level controllers or safety switches (e.g., low reagent, recirculation fault)

• Quick-Connect Probe Input
  Compatible with Hanna probes via DIN connector, with galvanic isolation for signal integrity

Specifications

• Model: HI981412-00

• Measurement Range:

  • pH: 0.00 to 14.00 (limited by probe capability)

  • Temperature: -5.0 to 105.0°C (23.0 to 221.0°F)

• Resolution: 0.01 pH; 0.1°C (0.1°F)

• Accuracy @25°C: ±0.10 pH; ±0.5°C (±0.9°F)

• Calibration:

  • User Calibration: One- or two-point with buffer (pH 4.01, 7.01, 10.01)

  • Process Calibration: ±0.50 pH adjustment

• Temperature Compensation: Automatic

• Pump Control:

  • On/Off with hysteresis

  • Proportional dosing with adjustable band

• Dosing Settings:

  • Set point: 4.00 to 10.00 pH

  • Hysteresis: 0.10 to 1.00 pH

  • Proportional Band: 0.10 to 2.00 pH

• Pump Flow Rate: 0.5 to 3.5 L/h (0.13 to 0.92 G/h)

• Max Output Pressure: 1 atm (14 psi)

• Alarm Relay Output: SPDT 2.5A / 230 VAC

• Inputs:

  • Probe input: Quick-connect DIN (galvanically isolated)

  • Digital input for external switches (e.g., flow or level control)

• Startup Delay: 0–600 sec

• Overtime Protection: 1 to 180 min or Off

• Power Supply: 100–240 VAC, 50/60 Hz

• Power Consumption: 15 VA

• Operating Environment: 0 to 50°C (32 to 122°F); max 95% RH (non-condensing)

• Dimensions: 90 × 142 × 80 mm (3.5 × 5.6 × 1.8″)

• Weight: 908 g (36 oz)

Applications

• Hydroponic Cultivation
  Maintains stable root zone pH for optimal nutrient absorption.

• Greenhouse Fertigation Systems
  Controls pH levels in real-time across irrigation zones.

• Commercial Farming and Vertical Growing
  Reduces manual intervention and error in nutrient delivery.

• Research Facilities
  Provides controlled pH environments for plant growth studies.

• Water and Nutrient Management Systems
  Automates pH correction in recirculating nutrient tanks and reservoirs.