Description
The HI97728 is an advanced portable photometer for the measurement of nitrate as nitrate-nitrogen in water up to 30.0 mg/L. This meter offers a superior optical system that uses a reference detector and narrowband interference filters for extremely fast and repeatable measurements.
In domestic water, nitrate is monitored because of the health effects it has on newborn babies. High levels of nitrates can cause a condition known as methemoglobinemia, or “blue baby syndrome.” The EPA has set the maximum level of contaminants in water at 10 mg/l. The HI97728 uses the cadmium reduction method to measure nitrate up to 30.0 mg/L (ppm) in water.
The method uses a cadmium-based reagent to reduce nitrate in the water to nitrite. In an acidic medium, the nitrite ion reacts with sulfanilic acid to form a salt that reacts with other reactants to produce a colored solution that is proportional to the concentration of nitrate in the sample.
The HI97728 has an innovative optical system that offers superior performance in accuracy, repeatability, and the short time it takes to make a measurement. This compact, waterproof meter is extremely easy to use with a tutorial mode that graphically guides the user step-by-step through performing a measurement. The use of a backlit dot matrix LED allows the use of virtual keys that make the operation of the meter very intuitive, including the selection of different units of measurement, the review of GLP data, the retrieval of the last 50 measurements, and the customization of the meter according to the user’s preferences.
The HI97728 is completely waterproof, including the bucket holder that is designed with ridges to protect the optical path from bucket scratches and a gasketed battery compartment that contains three common AA batteries. The compact design fits comfortably in the hand for use in the field or on a bench for use in a laboratory. The LCD screen measures 71 mm (2.75 “) by 37 mm (1.6”) and is backlit for easy viewing in all conditions.
Specs:
Nitrate Range: 0.0 to 30.0 mg/L (as NO3–N)
Nitrate Resolution: 0.1 mg/L
Nitrate accuracy: ±0.5 mg/L ±10% of reading at 25°C
Nitrate Method: Adaptation of the Cadmium Reduction Method
Light Source Photometer/Colorimeter: LED with 525 nm bandpass filter
Light Detector Photometer/Colorimeter: Silicon Photocell
Filter Bandwidth: 8 nm
Accuracy Wavelength Band Filter: ±1.0 nm
Bucket Type: 24.6mm diameter round (22mm inside)
LPG: Yes
Display: 128 x 64 pixel B/W LCD with backlight
Registration Type: Automatically registered
Log Memory: last 50 readings
Battery Type/Duration 1.5V AA alkaline (3 pcs.)(Not included) /> 800 measurements (without backlight)
Auto Power Off: after 15 minutes of inactivity (30 minutes before a READ measurement)
Ambient: 0 to 50°C (32 to 122°F); HR 0 to 100% (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″)
