Digital refractometer HI96822 – Hanna Instruments
302,60 €
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In stock (can be backordered)
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Description
Digital refractometer for saltwater (0 to 150 ppt, with option to measure in PSU and specific gravity)
The HI96822 digital refractometer eliminates the uncertainty associated with visual refractometers by measuring the refractive index to determine the salinity of natural and artificial seawater, including brackish water, ocean water, or saltwater aquariums. The instrument converts the refractive index of a sample to PSU, ppt, and specific gravity. These conversions are based on respected scientific publications that use the physical properties of seawater (not just sodium chloride). The HI96822 digital refractometer is an easy-to-use tool for measuring salinity in natural and artificial seawater, whether in the field, laboratory, or at home.
Designed for seawater salinity analysis (not NaCl)
Automatic temperature compensation
High-precision measurements displayed as PSU, ppt, and specific gravity
How to make a standard solution
Sodium chloride solutions can be used to verify the meter’s accuracy. The following table lists two sodium chloride solutions and their expected seawater ppt values.
To make a standard NaCl solution (g/100 g), follow the procedure below:
Place the container (such as a glass vial or dropper bottle with a lid) on an analytical balance.
Tare the balance.
To prepare an X% NaCl solution, weigh X grams of high-purity dried sodium chloride (CAS #: 7647-14-5; MW 58.44) directly into the container.
Add distilled or deionized water to the container until the total weight of the solution reaches 100 g.
Refractive Index
The HI96822 refractometer takes measurements based on the refractive index of a sample. The refractive index measures how light behaves as it passes through the sample. Depending on the sample’s composition, light will refract differently. By measuring this activity with a linear image sensor, the sample’s refractive index can be evaluated and used to determine its physical properties such as concentration and density. In addition to the linear image sensor, the HI96822 meter uses an LED light, a prism, and a lens to enable the measurement.
Temperature variations affect the accuracy of refractometry readings, so using temperature compensation is highly recommended for reliable results. The HI96822 digital refractometer contains a built-in temperature sensor and specialized algorithms that apply temperature compensation to the measurement and convert the refractive index to: PSU (Practical Salinity Units), ppt (parts per thousand), or SG (Specific Gravity) (20/20).
Salinity Scales
PSU (Practical Salinity Units) is defined as the ratio of the conductivity of seawater to a standard KCl solution. It is based on the work of UNESCO, ICES, SCOR, and IAPSO.
An older salinity scale is ppt (parts per thousand), where salinity is defined as "the weight of inorganic salts contained in 1 kg of seawater if all bromide and iodide are replaced by an equivalent amount of oxides" (Knudsen, 1901).
Specific gravity (20/20) is based on the published relationship between density at 20°C and the mass of dissolved salts in the seawater sample (CRC Handbook of Chemistry and Physics, 87th edition).
MAIN FEATURES
One-point calibration: Calibrate with distilled or deionized water
Small sample size: The sample size can be as small as 2 metric drops (100 μL)
Automatic Temperature Compensation (ATC): Automatically compensates for temperature variations
Fast and accurate results: Readings display in approximately 1.5 seconds
Upgraded dual-level LCD display: Large LCD screen shows nD20, nD, or % Brix and temperature readings simultaneously
Stainless steel measurement cell: Easy to clean and corrosion-resistant
Battery indicators: Displays battery percentage at startup and low battery indicator
Auto shut-off: To preserve battery life, the meter automatically powers off after three minutes of inactivity
Water-resistant IP65 protection: ABS plastic waterproof housing designed to operate under laboratory and field conditions
Specification
Technical Specifications
| Shipping Package Weight (Est.) | 1,0 kg |
|---|---|
| Dimensions (L, W, H) | 192 x 102 x 67 mm |
| Weight (g, kg, lbs) | 420 g |
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