Hanna HI97732 Dissolved Oxygen Portable Photometer

Hanna HI97732 is an advanced portable photometer for the measurement of dissolved oxygen in the water. This meter offers a superior optical system that utilizes a reference detector and narrowband interference filters for extremely fast and repeatable measurements.
  • Measuring Range: 0.0 to 10.0 mg/L
  • Resolution: 0.1 mg/L
Product Code: 811410243
Brand: HANNA
Warranty: 6 Months
Product Documents
Availability: In Stock
Dissolved oxygen (DO) analysis measures the amount of gaseous oxygen (O2) dissolved in an aqueous solution. Dissolved oxygen is one of the most important parameters in aquatic systems. DO is required for metabolism by aerobic organisms and also influences inorganic chemical reactions. Understanding of the solubility and dynamics of oxygen distribution is essential to interpreting both biological and chemical processes within water bodies. Oxygen enters water by diffusion from the surrounding air by aeration (rapid movement) and as a product of photosynthesis. The amount of oxygen (or any gas) that can dissolve in pure water (saturation point) is inversely proportional to the temperature of the water; the warmer the water, the less dissolved oxygen is present.

In aquaculture, dissolved oxygen is arguably the most important parameter of water quality. Most aquatic species require a minimum of 3 mg/L (ppm) dissolved oxygen, but 8 to 10 mg/L (ppm) is preferable.

The HI97732 uses an adaptation of the Standard Methods for Examination of Water and Wastewater, 23rd edition, azide modified Winkler method to measure dissolved oxygen concentrations up to 10.0 mg/L (ppm). When reagent is added to a sample containing DO, the sample turns a yellow hue; the greater the concentration, the deeper the color. The associated color change is 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 dissolved oxygen determination, a narrow band interference filter at 466 nm allows only blue light to be emitted and passed through the sample cuvette. The sample will produce a yellow color, with an intensity proportional to the concentration of dissolved oxygen. The absorbance of blue light increases as the intensity of yellow light increases resulting in less transmittance of light hitting the silicon photo detector.

Specifications of Hanna HI97732 Dissolved Oxygen Portable Photometer

General Specifications
Brand Hanna
Manufacturer Hanna Instruments, Inc.
Origin Romania
Model Number HI97732
Warranty Conditions Manufacturing Fault
Dissolved Oxygen
Range 0.0 to 10.0 mg/L (as O2)
Measurement Method Adaptation of Standard Methods for the Examination of Water and Wastewater, 23rd Edition, Azide Modified Winkler Method
Resolution 0.1 mg/L
Accuracy ±0.4 mg/L ±3% of reading at 25°C
Additional Specifications
Logging Memory 50 readings
Auto-off after 15 minutes of inactivity (30 minutes before a READ measurement)
Display 128 x 64 pixel B/W LCD with backlight
Environment 0 to 50°C (32 to 122°F); 0 to 100% RH (IP67)
Light Source LED with 466 nm bandpass filter
Light Detector Silicon photocell
Filter Bandwidth 8 nm
Filter Wavelength Accuracy ±1.0 nm
Cuvette Type Round 24.6 mm diameter (22 mm inside)
Power Supply 1.5 V AA Alkaline (3 pcs.) / > 800 measurements (without backlight)
Weight & Dimension
Weight 380 g
Dimensions 142.5 x 102.5 x 50.5 mm
Ordering Information
Inside the Box HI97732C is supplied with CAL Check standards, cuvettes (2), caps (2), plastic inserts for cuvette, (2), scissors, cuvette cleaning cloth, 1.5V AA batteries (3), instruction manual, and instrument quality certificate packaged in a rugged, thermoformed carrying case. HI97732 is supplied with cuvettes (2), caps (2), plastic inserts for cuvettes (2), 1.5V AA batteries (3), instruction manual, and instrument quality certificate.