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HI2630 and HI2631

using the four-ring conductivity probe

EC 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 ‡

EC Resolution

0.01 μS/cm
0.1 μS/cm 1 μS/cm
0.01 mS/cm 0.1 mS/cm

EC Accuracy at 25 °C / 77 °F

±1% of reading
(±0.05 μS/cm or 1 digit,whichever is greater)

TDS 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 (with 0.80 factor) absoluteTDS***

TDS Resolution

0.01 ppm
0.1 ppm
1 ppm 0.01 g/L

TDS Accuracy at 25 °C / 77 °F

±1% of reading (±0.03 ppm or 1 digit, whichever is greater

Salinity* Range

0.0 to 400.0 % NaCl
2.00 to 42.00 PSU
0.00 to 80.00 g/L

Salinity* Resolution

0.1% NaCl
0.01 PSU
0.01 g/L

Salinity* Accuracy at 25 °C / 77 °F

±1% of reading

Temperature Range

−20.0 to 120.0 °C**(−4.0 to 248.0 °F)

Temperature Resolution

0.1 °C (0.1 °F)

Temperature Accuracy at 25 °C / 77 °F

±0.5 °C (0.9 °F)

EC 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"

Salinity calibration* (% NaCl only)

Single point with HI7037 standard

Temperature compensation

• Automatic, −5 to 100 °C (23 to 212 °F)
• NoTC, can be selected to measure absolute conductivity

Conductivity temperature coefficient*

0.00 to 6.00 %/°C (EC and TDS only)
(1.90 %/°C default)

TDS factor*

0.40 to 0.80 (0.50 default)

DO Salinity compensation

0 to 40 g/L

Logging (HI2631 only)

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)*

Notes

*When operating in Standard Mode in HI2631 only!br>** Temperature limits will be reduced to actual probe limits.
*** Absolute conductivity (TDS) is the conductivity value without temperature compensation.

PC interface (HI2631 only)

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

Dimensions

205 x 160 x 77 mm (8.0 x 6.2 x 3.0 inches)

Weight

Approximately 0.85 kg (1.87 lbs.)