Waterproof portable digital refractometer, sodium chloride in seawater HI96822 HANNA

HI96822 Digital Seawater Refractometer Hanna Instruments

The HI96822 is a portable and robust digital refractometer designed for measuring the salinity of natural or artificial seawater. It displays results in three different measurement units and offers high accuracy thanks to automatic temperature compensation.

Product Description

The HI96822 measures the refractive index of the sample to determine the true salinity of seawater, taking into account its physical properties. Unlike mechanical refractometers, it eliminates visual interpretation errors and provides a quick and reliable digital reading.

The instrument operates with just two buttons, one dedicated to calibration with distilled or deionized water, the other to measurement. Results are displayed in a matter of seconds.

Displayed Measurement Units

The refractometer displays results in practical salinity units (PSU), parts per thousand (ppt), and specific gravity SG (20/20). Conversions are based on scientific publications considering the actual physical properties of seawater.

Measurement Principle

The HI96822 uses a linear image sensor, an LED, a prism, and a lens to measure the refractive index of the sample. Depending on the composition of the water, the light is refracted differently, allowing the determination of salinity and density.

Temperature variations influence the refractive index. Therefore, the instrument integrates a temperature sensor and automatically applies compensation algorithms to ensure reliable results.

In addition to the linear image sensor, the HI96822 uses a LED, a prism, and a lens to make the measurement possible.

Technical Specifications

Product Type: Digital refractometer for seawater

Measured Parameters: Salinity and density

Units: PSU, ppt, SG (20/20)

Calibration: One point with distilled or deionized water

Sample Volume: Approximately 100 µL

Response Time: Approximately 1.5 seconds

Built-in Functions

Automatic temperature compensation for reliable measurements

Dual display showing both measurement and temperature simultaneously

Corrosion-resistant stainless steel measurement cell

Battery level indicator at startup and low battery alert

Automatic shut-off after three minutes of inactivity

IP65 waterproof casing suitable for field or laboratory use

Use and Verification

The accuracy of the instrument can be verified using sodium chloride standard solutions. It is possible to prepare a control solution by dissolving a defined mass of pure sodium chloride in distilled or deionized water to obtain a total solution of 100 g.

Package Contents

Hanna Instruments HI96822 Digital Seawater Refractometer.