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HI2631 enables fast, accurate measurements utilizing the Hanna Instruments® HI763100 digital conductivity electrode with an integral temperature sensor. The probe has a unique serial number and, once connected, is automatically identified by the meter.
The HI2631 measures conductivity (EC) and TDS while adding salinity measurement and calibration along with data logging capabilities. The intuitive design simplifies configuration, calibration, measurement, data logging and transfer (to a USB thumb drive or computer).
HI2631 offers a Basic Mode that streamlines measurement configuration and is useful for routine applications. Additionally, HI2631 can be used in Standard Operating Mode, where all features and capabilities are enabled.
Large display with capacitive keys The meter features a 5.5” (14 cm) LCD display. The large display provides a 130 ° wide viewing angle.
Main feature points
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Automatic parameter recognition
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Choice of measurement unit:
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Conductivity: μS/cm, mS/cm
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TDS: ppm (mg/L), g/L
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Salinity: NaCl, PSU, g/L
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Adjustable resolution for EC measurements
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Basic mode for simplified operation
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Dedicated GLP key
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Internal clock and date
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Logging function
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GLP data included with logged data
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Simplified data transfer to a PC
Features in-depth
Digital probe input
Simply connect each probe via the 3.5 mm jack; Digital Smart Electrodes are automatically recognized.
Clear, full text readout
The HI2631 presents clear, detailed text prompts at the bottom section of the screen.
Two operating modes
HI2631 can be used in Standard or Basic Operating Modes. Standard Mode enables all features while Basic Mode displays a simplified screen and features — ideal for routine measurements.
Data logging
HI2631 provides data storage capacity, up to 1000 log records. Each data set comprehensively includes readings, GLP information, as well as date and time stamps.
GLP (Good Laboratory Practice)
The sensor retains data from the most recent calibration, including the date, time, and standards utilized. This information is available in basic and standard modes and is also included with logged data.
Capacitive touch keypad
HI2631 features sensitive capacitive touch buttons for accurate keystrokes for navigating menus and screens. Since they are part of the screen, the buttons can never get clogged with sample residue.
Easy to read LCD
HI2631 features a 5.5” (14 cm) LCD display that you can clearly view from over 5 m (16.4’). The large display, with its wide 150° viewing angle, provides one of the easiest to read LCDs in the industry.
USB-C port for data transfer
The HI2631 features a streamlined USB-C port that facilitates transferring data to your computer.
| Parameter | Characteristic | Specification |
| EC (using HI763100 four-ring conductivity probe) | Range |
0.00 to 29.99 μS/cm 30.0 to 299.9 μS/cm 300 to 2999 μS/cm 3.00 to 29.99 mS/cm 30.0 to 200.0 mS/cm up to 500.0 mS/cm absolute conductivity ‡ |
| Resolution |
0.01 μS/cm 0.1 μS/cm 1 μS/cm 0.01 mS/cm 0.1 mS/cm |
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| Accuracy (@25°C/77°F) | ±1% of reading (±0.05 μS/cm or 1 digit, whichever is greater) | |
| Calibration |
Cell factor calibration Six standards available: 84 μS/cm, 1413 μS/cm, 5.00 mS/cm, 12.88 mS/cm, 80.0 mS/cm, 111.8 mS/cm One point offset: 0.00 μS/cm |
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| Temperature compensation |
• Automatic, -5 to 100 °C (23 to 212 °F) • NoTC, can be selected to measure absolute conductivity |
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| Temperature coefficient |
0.00 to 6.00 %/°C (EC and TDS only) (1.90 %/°C default) |
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| TDS (using HI763100 four-ring conductivity probe) | Range |
0.00 to 14.99 ppm (mg/L) 15.0 to 149.9 ppm (mg/L) 150 to 1499 ppm (mg/L) 1.50 to 14.99 g/L 15.0 to 100.0 g/L up to 400.0 g/L absolute TDS ‡ (with 0.80 factor) |
| Resolution |
0.01 ppm 0.1 ppm 1 ppm 0.01 g/L 0.1 g/L |
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| Accuracy (@25°C/77°F) | ±1% of reading (±0.03 ppm or 1 digit, whichever is greater) | |
| Calibration | through EC calibration | |
| TDS factor | 0.40 to 0.80 (0.50 default) | |
| Salinity* (using HI763100 four-ring conductivity probe) | Range |
0.0 to 400.0 % NaCl 2.00 to 42.00 PSU 0.00 to 80.00 g/L |
| Resolution |
0.1% NaCl 0.01 PSU 0.01 g/L |
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| Accuracy (@25°C/77°F) | ±1% of reading | |
| Calibration * (% NaCl only) | Single point with HI7037 standard | |
| Temperature | Range | -20.0 to 120.0°C; -4.0 to 248.0°F ** |
| Resolution | 0.1 °C (0.1 °F) | |
| Accuracy (@25°C/77°F) | ±0.5 °C (0.9 °F) | |
| Additional specifications | Logging |
Up to 1000* (400) records organized in: • Manual log-on-demand, maximum 200 logs • Manual log-on-stability, maximum 200 logs • Interval logging*, maximum 600 logs (100 lots) |
| PC interface | USB-C | |
| Power supply | USB Type C (5 VDC; 500 mA) | |
| Environment |
0 to 50 °C (32 to 122 °F) Maximum 95 % RH non-condensing |
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| Dimensions | 205 x 160 x 77 mm (8.0 x 6.2 x 3.0 ”) | |
| Weight | Approximately 0.85 kg (1.87 lbs.) |
