Hanna Instruments HI 93728 Nitrate-Nitrogen Photometer

The Hanna Instruments HI 93728 is a reliable and precise nitrate-nitrogen photometer, ideal for accurate field measurements. The device is in full working condition and ready for immediate deployment. Nitrates, originating from organic matter decomposition or fertilizers, can transform into nitrites, posing health dangers. Regulatory guidelines are stringent, with maximum allowable levels set at 45 mg/L globally, 50 mg/L in Europe for potable water, and 10 mg/L nitrate nitrogen by the USA EPA, equivalent to 45 mg/L nitrates.

The HI 93728 photometer measures nitrogen nitrate ranging from 0 to 30 mg/L (NO₃-N), with the ability to convert readings into nitrate concentrations up to 133 mg/L using a multiplication factor of 4.43. Key features include a measurement range of 0.0 to 30.0 mg/L (NO₃-N), a resolution of 0.1 mg/L, and accuracy within ±0.5 mg/L ±10% of the reading. The unit is equipped with a 555 nm LED light source and a silicon photocell for light detection. It operates on a 9V battery allowing approximately 40 hours of continuous use. The device is adaptable, functioning in environments from 0 to 50°C (32 to 122°F) with a maximum relative humidity of 95% non-condensing. Compact yet robust, its dimensions are 180 x 83 x 46 mm (7.1 x 3.3 x 1.8 inches) and it weighs 290 g (10 oz.). The photometer utilizes the cadmium reduction method, generating an amber tint upon reaction with nitrate-nitrogen, facilitating straightforward and precise analysis.