Description
 Hach GLI Pro is a high-precision conductivity/TDS measurement system built for demanding industrial water applications. It features advanced digital signal processing, rugged GLI conductivity sensors, real-time temperature compensation, and superior measurement stability. Ideal for ultrapure water, RO/DM plants, power utilities, chemical processes, and wastewater treatment.
🔧 HACH GLI Pro — Key Technical Data & Selection Parameters
| Parameter | Specification / Details |
| Measurement Range | 0.055 µS/cm to 2,000 mS/cm (depends on sensor) |
| TDS Range | Programmable factor 0.30–1.00 |
| Sensor Type | GLI 6-series digital conductivity sensors |
| Cell Constants | 0.01 / 0.1 / 1.0 / 10.0 |
| Temperature Compensation | Automatic (NaCl, KCl, natural water algorithms) |
| Process Temperature | –20 °C to +200 °C (sensor-specific) |
| Accuracy | ±0.5% of reading (high-accuracy mode available) |
| Response Time | Fast DSP-based measurement |
| Outputs | Dual 4–20 mA isolated |
| Communication | MODBUS, PROFIBUS, HART (depending on module) |
| Relays | Up to 4 programmable alarms |
| Display | High-contrast multi-line LCD |
| Power Supply | 24 VDC / 100–240 VAC |
| Enclosure | NEMA 4X / IP65 field mount |
| Calibration | Auto/manual — 1 or 2 point |
| Typical Applications | RO/DM, ultrapure water, boilers, EDI, pharma, semiconductor, cooling water, ETP/STP |





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