Hanna HI981421-01 GroLine pH EC/TDS

Hanna HI981421-01 GroLine pH EC/TDS

The Hanna HI981421-01 GroLine pH EC/TDS is a robust, real-time monitoring system engineered specifically for hydroponic nutrient management. Designed with an industrial-grade threaded multiparameter probe, this system continuously tracks pH, EC (electrical conductivity), TDS (total dissolved solids), and temperature in nutrient reservoirs or flow lines.

With automatic logging, GLP traceability, USB data export, and a durable IP65-rated enclosure, the HI981421-01 provides precision control for growers seeking consistent yields and healthy crops.

Features

• All-in-One Monitoring for pH, EC, TDS & Temperature
  A single compact device to monitor all essential water quality parameters continuously.

• Industrial Threaded Probe for Inline Installation
  The included HI1285-8 multiparameter probe features ¾” NPT threading for secure, direct mounting into tanks or irrigation lines.

• High-Accuracy Measurements
  Delivers precise readings with ±0.05 pH and ±0.1 mS/cm accuracy, critical for nutrient solution management.

• Automatic Data Logging
  Logs data every 15 minutes for the last 30 days, including min, max, and average values—ideal for troubleshooting and trend analysis.

• Easy Calibration Options
  Supports one- or two-point calibration with standard pH buffers, plus Quick Cal one-step calibration using Hanna’s solution.

• Automatic Temperature Compensation
  Built-in temperature sensor corrects pH, EC, and TDS readings for consistent accuracy under changing conditions.

• Customizable Alarm System
  Set high and low alarm limits for all parameters with visual alerts and relay output to trigger external devices.

• GLP Traceability
  Stores the last five calibrations with timestamps for both pH and EC for audit-ready compliance.

• User-Friendly Interface
  Large 128 x 64 pixel LCD with green backlight for clear display in any lighting condition.

• Rugged Design for Agricultural Use
  Compact IP65 enclosure, DIN connector, and 12VDC power supply make this unit ideal for demanding grow environments.

Specifications

pH Measurement

• Range: 0.00 to 14.00 pH

• Resolution: 0.01 / 0.1 pH

• Accuracy: ±0.05 pH (±0.1 pH depending on range)

• Calibration:

  • One or two-point with pH 4.01, 7.01, or 10.01

  • One-point Quick Cal with Hanna calibration solution

• Temperature Compensation: Automatic (0.0 to 60.0°C)

EC Measurement

• Range: 0.00 to 10.00 mS/cm

• Resolution: 0.01 mS/cm

• Accuracy:

  • ±0.1 mS/cm (0.00–5.00 mS/cm)

  • ±0.2 mS/cm (5.00–10.00 mS/cm)

• Calibration: One-point at 1.41 or 5.00 mS/cm; Quick Cal support

• Temperature Compensation: Automatic with β = 1.9%/°C

TDS Measurement

• Range:

  • 0–5000 ppm (0.5 CF)

  • 0–7000 ppm (0.7 CF)

• Resolution: 10 ppm

• Accuracy: ±2% full scale

• TDS Conversion: Selectable factor (0.5 or 0.7)

Temperature

• Range: 0.0 to 60.0°C (32.0 to 140.0°F)

• Resolution: 0.1°C / 0.1°F

• Accuracy: ±0.5°C / ±1°F

System & Logging

• Alarm Set Points: High/low limits for pH, EC, TDS, Temp with enable/disable

• Logging: Automatic for 30 days (15-minute interval)

• GLP: Stores last 5 calibrations (pH and EC)

• Display: 128 × 64 pixel B/W LCD with green backlight

• Connectivity: USB Type-C (for flash drive or device connection)

Probe

• Model: HI1285-8

• Type: pH/EC/TDS/Temp multiparameter, pre-amplified

• Material: Polypropylene body

• Connection: DIN connector with 2 m cable

• Mounting: Threaded (¾” NPT for insertion)

General

• Power Supply: 12VDC adapter (included)

• Operating Environment: -5 to 50°C (23 to 122°F), RH max 95%, non-condensing

• IP Rating: IP65

• Dimensions: 125 × 185 × 38 mm

• Weight: 333 g (11.7 oz)

Applications

• Hydroponics & Controlled Agriculture
  Provides continuous oversight of nutrient solution conditions to maintain crop health and yield.

• Greenhouse & Indoor Grow Environments
  Easily installed in tanks or pipes with threaded probe for real-time monitoring and automation.

• Fertigation Systems
  Helps optimize pH and nutrient levels in irrigation water to prevent over- or under-feeding.

• Aquaponics
  Ensures water chemistry remains within safe limits for both plants and aquatic life.

• Commercial Grow Facilities & Nurseries
  A reliable monitoring solution for operations that require scalable, hands-off nutrient control.