HI83748 microcomputer alcohol tartaric acid concentration analyzer

The HI83748 photometer is used to determine tartaric acid in wine. The precision and ease of use of the portable design that conforms to ergonomics, with a good optical system, narrowband interference filter, and silicon photodetector combination, ensure accurate photometric readings every time. The carefully designed colorimetric cup locking system ensures that the colorimetric cup is inserted into the same position in the measuring unit each time to maintain a consistent path length.

Product Overview:

Measurement range: 0.0 to 5.0g/L (ppt), tartaric acid reacts with the reagent in a yellow or orange red color

The HI83748 photometer is used to determine tartaric acid in wine. The precision and ease of use of the portable design that conforms to ergonomics, with a good optical system, narrowband interference filter, and silicon photodetector combination, ensure accurate photometric readings every time.

The carefully designed colorimetric cup locking system ensures that the colorimetric cup is inserted into the measuring unit at the same position each time to maintain a consistent path length.

Tartaric acid and tartaric acid play an important role in the stability of wine. They can exist in various forms in wine and juice, such as tartaric acid (H2T), potassium bitartrate (KHT), or calcium tartrate (CaT). These ratios mainly depend on the pH value of the wine. At an alcohol pH of 3.7, the percentage of tartrate present as hydrogen tartrate (HT -) is the highest.

The formation of crystalline sediment (tartrate sediment) is a phenomenon of wine aging that cannot meet customer requirements. Therefore, testing and reducing the possibility of bottle sedimentation are very important. For example, by adjusting the pH value of wine, winemakers can significantly influence the potential for wine formation.

In some red wines, the potassium concentration range in wine is 600 to 2500 ppm. Although potassium bitartrate is soluble in water, its solubility is reduced by alcohol and low temperatures. Especially during alcohol fermentation, potassium bitartrate becomes increasingly insoluble, leading to supersaturation and precipitation. KHT stability can be restored by cooling (with or without seeding). Wines with an initial pH value below 3.65pH may exhibit a decrease in pH during cold stabilization, as each KHT precipitate produces a free proton. The pH may decrease by up to 0.2 pH units. For wines with a pH value higher than 3.7pH, the pH will shift to a higher pH value.

The calcium concentration can range from 6 to 165 ppm and can form crystalline precipitates by complexing with tartrate or oxalate salts. The instability of calcium tartrate usually occurs 4 to 7 months after fermentation and is independent of temperature.

Sulfate, protein, gum, and polyphenols can form stable complexes with tartrate, thereby inhibiting shell formation. The complex mainly consists of red polyphenols and tartaric acid, as well as proteins in white wine. This explains why the retention ability of tartaric acid weakens when pigment polymerization occurs, leading to delayed casse. On the contrary, sulfates are complexed with 50% potassium in white wine and 100% in red wine.

The concentration of tartaric acid in wine is usually 1.5 to 4.0 grams per liter. The concentration of this acid should not be confused with the total acidity or titratable acidity of wine, which is also commonly expressed as tartaric acid content. Although tartaric acid is the main acid present (up to 60% of total acidity), other volatile acids such as malic acid, citric acid, and several others contribute significantly to total acidity.

HI83748 uses two reagents to determine the concentration of tartaric acid to be less than 5.0 g/L (ppt).

When two reagents are added to a sample containing tartaric acid, the sample will turn orange red in color; The higher the concentration, the darker the color.

Then perform colorimetric analysis on the relevant color changes based on the Bill Lambert law. This principle states that light is absorbed by complementary colors and the emitted radiation depends on concentration.

To determine tartaric acid, a 525nm (green) narrowband interference filter only allows the silicon photodetector to detect green light and omits all other visible light emitted by the tungsten lamp.

As the color change of the reaction sample increases, the absorbance of light of a specific wavelength also increases, while the transmittance decreases.

Performance characteristics

Built in timer - displays the remaining time before measurement, and at the end of the timer, the instrument will automatically read the reading to ensure consistency in response time for multiple batches of measurements.

Zero key - Simply press the zero key on the instrument panel to eliminate color deviation caused by the color in the wine sample before adding reagents.

Measurement Units - Display appropriate measurement units and readings

Error messages - warning issues on the display screen, including unlimited, out of range, and under range readings, as well as light source errors;

Automatic shutdown - The measurement mode will automatically shut down after 15 minutes of inactivity;

Battery status - battery level indicator, displaying remaining battery level and prompting users to replace the battery in a timely manner;

HI83748-20 Customized Tartaric Acid Analysis Kit with 20 Predictions

Customized specialized tartaric acid analysis kit, suitable for measurement range: 0.0 to 5.0 g/L (ppt); Convenient and fast implementation of rapid and accurate colorimetric measurement of tartaric acid, which reacts with reagents to produce yellow or orange red color.

Prefabricated high-quality tartaric acid analysis kit, rigorously certified with various measuring tools and containers, carefully formulated in a temperature and humidity environment that meets the requirements, and traceable to NIST standard reference materials (SRM)

Operation guide:

Add 5mL of HI83748A-0 pre made reagent to the wine sample, reset the instrument to zero, and then add 6 drops of HI83748B-0 pre made reagent to the glucose sample to be tested. Tartaric acid reacts with the reagent to produce a yellow or orange red color. The HI83748 photometer can be used to determine the concentration of tartaric acid based on the color produced, and the result will be displayed in g/L (ppt).

Technical parameters:

measurement range

0.0 to 5.0 g/L (ppt)

resolution

precision

@25°C (77°F)

repetitiveness

measurement method

Tartaric acid reacts with reagents and appears yellow or orange red in color

optical system

Narrowband interference filter, silicon photovoltaic cell @ 525 nm

Power mode

4 × 1.5VAA batteries; If you don't do anything for 15 minutes, it will automatically shut down

Usage environment

0 to 50°C（32 to 122°F），RH max 95%， 无冷凝

Size and Weight

Host size: 224 x 87 x 77 mm (8.8 x 3.4 x 3.0 ")

Host weight: 512 g (18 oz.)

Exclusive accessories

HI83748-20 customized specialized tartaric acid analysis kit, with 20 prediction times

HI83748

Host, HI83748-20 tartaric acid reagent, HI731313W dedicated glass colorimetric dish (2 sets), HI731340 dedicated quantitative (200 μ L) automatic sampler, HI731318 glass colorimetric cup cleaning cloth (2 pieces), AC230V/12VDC power adapter, Chinese and English user manual, HI721010 customized special instrument carrying case