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Customer Support: (800) 842-6629

Photometer for Reducing Sugars in Wine - HI83746


In stock

The HI83746 Photometer for Reducing Sugars in Wine combines accuracy and ease of use in an ergonomic, portable design. A user can accurately determine the concentration of reducing sugars in wine within a 0.00 to 50.0 g/L (ppt) range using the HI83746-20 ready made reagents.

  • Built-in Timer
  • Automatic Shut Off
  • Ready-made Reagents


The HI83746 photometer is for the determination of reducing sugars in wine. Hanna’s photometers feature an advanced optical system; the combination of a special tungsten lamp, a narrow band interference filter, and silicon photodetector ensure accurate photometric readings every time. The exclusive cuvette locking system ensures that the cuvette is inserted into the measurement cell in the same position every time to maintain a consistent path length.


Features at-a-glance

Built-in timer – Display of time remaining before a measurement is taken. Ensures that all readings are taken at the appropriate reaction intervals for the test being performed.

Zero key – A simple press of the zero key on the face of the meter will account for the color and imperfections in the wine sample before reagent addition.

Auto shut-off – Automatic shut-off after 15 minutes of non-use when the meter is in measurement mode. Prevents wastage of batteries in the event the meter is accidentally left on.

Battery status indicator – Indicates the amount of battery life left.

Error messages – Messages on display alerting to problems including no light, inverted sample, and out of range.

Units of measure – Appropriate unit of measure is displayed along with reading.

optical system

Sugar is an essential component in the production of wine. During alcoholic fermentation, yeast consume sugars found in the grape juice, or must, and converts it to ethyl alcohol and carbon dioxide. In the case of certain styles of wine such as semi-sweet or dessert wines, some sugar is allowed to remain post-fermentation. This residual sugar can serve to provide a sweeter character to the final blend or play a role in microbial stability.

The primary fermentable sugars found in grapes are glucose and fructose. These two simple sugars are also known as reducing sugars because they contain functional groups capable of being oxidized under certain conditions. After reaction with excess alkaline cupric tartrate (Fehling reagents), the content of reducing sugars can be determined colorimetrically. The Fehling method is not an exact determination but an index of the reducing sugar concentration, because the reaction depends upon the amount and type of reducing sugars present. When the reducing sugar content is known at the beginning of fermentation, the potential alcohol degree can be estimated by multiplying the sugar concentration (in g/L) by 0.06.

The HI83746 uses the Fehling method to determine the concentration of reducing sugars less than 50.00 g/L (ppt). When Fehling’s A and Fehling’s B Solutions react with a sample containing reducing sugars, the sample will undergo a color change; the greater the concentration, the deeper the color. The associated color change is then colorimetrically analyzed according to the Beer-Lambert Law. This principle states that light is absorbed by a complementary color, and the emitted radiation is dependent upon concentration. For determination of reducing sugars, a narrow band interference filter at 610 nm (orange) allows only orange light to be detected by the silicon photodetector and omits all other visible light emitted from the tungsten lamp. As the change in color of the reacted sample increases, absorbance of the specific wavelength of light also increases, while transmittance decreases.

Typical content of reducing sugars in must and wine
Must sweet must 20 to 25 % 200 to 250 g/L
normal 10 to 20 % 100 to 200 g/L
in fermentation 4 to 12.5 % 40 to 125 g/L
Wine sweet 2.5 to 12.5 % 25 to 125 g/L
semi-sweet 0.8 to 2.5 % 8 to 25 g/L
almost dry 0.2 to 0.8 % 2 to 8 g/L
dry 0 to 0.2 % 0 to 2 g/L

Additional information

Weight 2.9 kg

Reducing Sugars


SKU HI83746-01
Name Photometer for Reducing Sugars in Wine – HI83746
Reducing Sugars Range 0.00 to 50.00 g/L (ppt)
Reducing Sugars Resolution 0.25 g/L
Reducing Sugars Method Fehling Method
Precision ±0.50 @ 10.00 g/L
Photometer/Colorimeter Light Source Tungsten lamp with narrow band interference filter @ 610 nm
Photometer/Colorimeter Light Detector Silicon Photocell
Display Liquid Crystal Display (LCD)
Power Supply 4 (1.5V) AA batteries or 12 VDC adapter
Battery Type/Life 1.5V AA batteries
Automatic Shut-Off auto-off after 15 minutes of non-use
Environment 0 to 50°C (32 to 122°F); RH max 95% non-condensing
Weight 512 g (18 oz)
Dimensions 224 x 87 x 77 mm (8.8 x 3.4 x 3”)

Ordering Info

HI83746 is supplied with glass cuvettes and caps (4), reagents for approximately 20 tests (HI83746-20), HI93703-59 charcoal, 200 µL automatic pipette with two plastic tips, 1000 µL automatic pipette with plastic tips (2), instruction sheet for automatic pipette, spoon, funnel, filter paper (25 pieces), cuvette wiping cloth, 12 VDC adapter, 4 (1.5V) AA batteries, instruction manual, instrument quality certificate, warranty card, and rigid carrying case.


Photometer for Reducing Sugars in Wine – HI83746