Oxygen Meter
The Dissolved oxygen is needed for the survival and growth of fish, vegetation, bacteria and aquatic organisms. The absence of oxygen permits anaerobic decay of organic matter and the production of toxic material in water. Low level of oxygen are normally indicative of serious pollution in fresh and ground water.
SOM CODE:1462/732
MODEL :HI97732
COMPANY : HANNA, ITALY
DESCRPTION
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 photodetector.
Specification
| SKU | HI97732-web |
|---|---|
| Product Name | Dissolved Oxygen Portable Photometer with CAL Check – HI97732 |
| Quote Required | No |
| Dissolved Oxygen Range | 0.0 to 10.0 mg/L (as O2) |
| Dissolved Oxygen Resolution | 0.1 mg/L |
| Dissolved Oxygen Accuracy | ±0.4 mg/L ±3% of reading at 25°C |
| Dissolved Oxygen Measurement Method | adaptation of Standard Methods for the Examination of Water and Wastewater, 23rd Edition, Azide Modified Winkler Method |
| Photometer/Colorimeter Light Source | LED with 466 nm bandpass filter |
| Photometer/Colorimeter Light Detector | silicon photocell |
| Bandpass Filter Bandwidth | 8 nm |
| Bandpass Filter Wavelength Accuracy | ±1.0 nm |
| Cuvette Type | round 24.6 mm diameter (22 mm inside) |
| GLP | yes |
| Display | 128 x 64 pixel B/W LCD with backlight |
| Logging Memory | 50 readings |
| Battery Type/Life | 1.5 V AA Alkaline (3 pcs.) / > 800 measurements (without backlight) |
| Automatic Shut-Off | after 15 minutes of inactivity (30 minutes before a READ measurement) |
| Environment | 0 to 50°C (32 to 122°F); 0 to 100% RH (IP67) |
| Weight | 380 g (13.4 oz.) |
| Dimensions | 142.5 x 102.5 x 50.5 mm (5.6 x 4.0 x 2.0″) |
| Ordering Information | 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. |
| Hsn Code | 90275010 |
Technical Specification
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