High-Range Fluoride Portable Photometer – HI97739-kit

Fluoride is best known for preventing tooth decay. Water authorities often add fluoride to drinking water to maintain approximately a 1.0 mg/L (ppm) concentration. Fluoride can be found naturally in groundwater, particularly if a reservoir is in close proximity to seawater. While fluoride does help prevent tooth decay, too little can be ineffective while too much can cause staining of teeth.The HI97739 uses an adaptation of the SPADNS method to measure fluoride concentrations up to 20.0 mg/L (ppm). When the colored reagent is added to samples containing fluoride, the fluoride in the sample will form a colorless complex; the greater the concentration, the clearer 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 fluoride determination, a narrow band interference filter at 575 nm allows only green-yellow light to be emitted and passed through the sample cuvette. The sample will produce a blue color, which its? intensity is proportional to the concentration of fluoride. The absorbance of the yellow light increases as the intensity of blue increases resulting in less transmittance of light hitting the silicon pHotodector.The HI97739 has an innovative optical system that offers superior performance in accuracy, repeatability, and the short amount of time it takes to perform a measurement. This compact, waterproof meter is extremely user friendly with a tutorial mode that walks the user grapHically, step by step, in performing a measurement. The use of a backlit dot matrix LCD allows the use of virtual keys which makes the operation of the meter very intuitive including selecting different units of measure, reviewing GLP data, recalling the last 50 measurements, and customizing the meter to user preferences.HI97739 is completely waterproof including the cuvette holder that is designed with ridges to protect the optical path from getting scratched by the cuvette and a gasketed battery compartment that holds three common AA batteries. The compact design fits comfortably in the hand for use in the field or on a table for benchtop use. The LCD is backlit for easy viewing under all conditions.

• LED that generates very little heat

• 8 nm narrowband interference filter that is accurate to +/- 1 nm.

• Reference detector that modulates the voltage to LED for consistent light output.?

• A concave focusing lens that reduces errors from imperfections in the cuvette.

On-Screen Features

CAL CheckAdvanced features including CAL-Check to verify performance and if necessary, recalibrate.

Setup OptionsSetup options for meter personalization include date and time format, language, and enabling the tutorial mode.

Tutorial ModeTutorial mode for step-by-step instructions to guide a first-time user in how to perform a measurement correctly.

Reaction TimerBuilt-in reaction timer that ensures consistency amongst multiple users.