Sodium Content and Activity Portable Meter - HI931101

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Sodium Content and Activity Portable Meter - HI931101


The HI931101 is a rugged, waterproof, portable sodium content meter. This meter offers many features including automatic calibration, automatic temperature compensation, and on-screen instructions. There are four measurement ranges for sodium content, and a simple press of the MODE button allows for measurement of sodium ion activity. 

Five Measurement Ranges

Automatic Calibration

On-Screen Instructions


The HI931101 is a rugged, portable sodium content and activity meter designed to provide laboratory precision and accuracy under harsh conditions. This meter is ideal for a variety of applications in laboratories, food and beverage production, and water quality analysis.The HI931101 offers a variety of features including five distinct measurement ranges, automatic calibration to 1 or 2 points, temperature compensation, and on-screen instructions.

The HI931101 uses a BNC probe input for connecting the sodium ISE and a separate RCA connector for a thermistor temperature probe. The temperature probe provides for a high ±0.2 oC accuracy measurement for precise temperature readings.

Features at-a-glance

One or Two-Point CalibrationAutomatic calibration can be performed at 1 or 2 points with a choice of 3 buffers (0.23 g/L, 2.3 g/L, and 23.0 g/L). For greater accuracy, standard solutions should be calibrated at a temperature as close as possible to the temperature of the sample.

On-Screen InstructionsClear and easy to use on-screen instructions take you through all of the steps in performing a calibration and taking measurements.

Sodium Ion Selective Electrode - The HI931101 should be used with the FC300B (not included) sodium ion selective electrode, comprising a glass body and sodium sensitive membrane. The sodium sensitive membrane should be conditioned before performing a calibration. The conditioning of the electrode is a two-step process in which the glass is etched then rehydrated. Etching removes a thin layer of sensitive glass from the sodium membrane, exposing a sodium-containing fresh surface. Rehydrating after etching provides optimum conditions for the exchange of sodium ions between the membrane and solution.

Fixed Temperature Compensation - The HI931101 offers fixed temperature compensation of sodium measurements at 25°C.

Sodium Range 0.00 to 3.00 pNa; 15.0 to 150.0 mg/L (ppm) Na;0.150 to 1.500 g/L Na; 1.50 to 15.00 g/L Na; 15.0 to 60.0 g/L Na
Sodium Accuracy ±0.05 pNa; ±5% of reading (Na)
Sodium Calibration automatic, one or two point at 0.23 g/L, 2.3 g/L, 23.0 g/L
Temperature Range -20.0 to 120.0°C (-4.0 to 248.0°F)
Temperature Resolution 0.1°C (0.1°F)
Temperature Accuracy ±0.2°C; ±0.4°F (excluding probe error)
Temperature Compensation fixed at 25°C (77°F)
Required Probes FC300B glass body sodium ion-selective electrode with BNC connector and 1 m (3.3’) cable (not included)
HI7662 stainless steel temperature probe with 1 m (3.3’) cable (not included)
Battery Type/Life 1.5V AAA (3) / approx. 200 hours of continuous use
Environment 0 to 50°C (32 to 122°F); RH max 100%
Dimensions 185 x 72 x 36 mm (7.3 x 2.8 x 1.4’’)
Weight 300 g (10.6 oz.)