תיאור
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 utilizes a reference detector and narrow band interference filters for extremely fast and repeatable measurements.
- Displays results as nitrate or nitrate-nitrogen.
- Tutorial mode for step-by-step instructionsד
- CAL Check for performance verification and calibration
Details
In domestic water, nitrate is monitored due to the health effects that it has on newborn babies. High level of nitrates can cause a condition known as methemoglobinemia or "blue-baby syndrome". The EPA has set the maximum contaminant level in water at 10 mg/l. The HI97728 uses cadmium reduction method for measuring nitrate up to 30.0 mg/L (ppm) in water from 0.0 to 30.0 mg/L.
The method uses a reagent with cadmium to reduce the 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 reagents to produce a colored solution that is proportional to the concentration of nitrate that was in the sample.
The HI97728 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 LED 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.
HI97728 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 comfortable in the hand for use in the field or on a table for benchtop use. The LCD is 71 mm (2.75") by 37 mm (1.6") and 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 and offers 25% increase in light efficiency.
- Reference detector that modulates the LED voltage for consistent light output.
- A concave focusing lens that reduces errors from imperfections in the cuvette.
| Results can be displayed in multiple chemical forms. | Setup options for meter personalization include date and time format, language, and enabling the tutorial mode. | Advanced features including CAL-Check to verify performance, GLP for last calibration date, setup options and the ability to see all accessories used with the meter. |
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exceptionally intuitive user interface that is easy to read and understand. |
Tutorial mode for step-by-step instructions, including how to mix, to guide a first time user to preforming a measurement correctly |
Built-in reaction timer that ensures consistency amongst multiple users. |
HI97728 FEATURES/BENEFITS:
Stable Light Source: The internal reference system of the HI97728 photometer compensates for any drifts due to power fluctuations or ambient temperature changes. With a stable source of light the readings are fast and stable between your blank (zero) measurement and sample measurement.
High Efficiency Light Source: LED light sources offer superior performance compared to tungsten lamps. LEDs have a much higher luminous efficiency, providing more light while using less power. They also produce little heat, which could otherwise affect electronic stability.
High Quality Filters: Improved optical filters ensure greater wavelength accuracy and allow a brighter, stronger signal to be received. The end result is higher measurement stability and less wavelength error.
Greater Light Yield: A focusing lens collects all of the light that exits the cuvette, eliminating errors from imperfections and scratches that may be present in the glass. The use of the convex lens reduces the need for indexing cuvettes.
CAL Check Functionality: Hanna’s exclusive CAL Check feature allows for performance verification and calibration of the meter using NIST traceable standards. Our CAL Check standard vials are developed to simulate a specific absorbance value at each wavelength to verify the accuracy of subsequent readings.
Built-in Reaction Timer: Waiting the proper reaction time is of key importance when performing colorimetric measurements. The countdown timer displays the time remaining until a measurement will be taken, ensuring consistent results between sample measurements and users.
Large Cuvette Size: The sample cell of the HI97728 fits a round, glass cuvette with a 25 mm path length. The relatively long path length of the sample cuvette allows the light to pass through more of the sample solution, ensuring accurate measurements even in low absorbance samples.
Intuitive Dot Matrix Display: The HI97728 is designed with a backlit, graphic LCD. With virtual keys, a battery status indicator, and error messages. Users will find the meter interface intuitive and easy to read. A dedicated help key provides information relating to the current meter operation, and can be used at any stage in the setup or measurement process to show contextual help.
Auto-off Protection: The meter uses three common AA batteries that allow for about 800 measurements to be taken. The auto-off feature automatically shuts off the meter after 15 minutes of inactivity in order conserve battery life.
HI97728 SPECIFICATIONS:
| Nitrate Range | 0.0 to 30.0 mg/L (NO3-N) |
| Nitrate Resolution | 0.1 mg/L |
| Nitrate Accuracy @ 25 oC | ±0.5 mg/L ±10% of reading |
| Nitrate Method | Adaptation of Cadmium Reduction Method |
| Photometer Light Source | Light emitting diode |
| Bandpass Filter Wavelength | 525nm |
| Bandpass Filter Bandwidth | 8 nm |
| Bandpass Filter Wavelength Accuracy | ±1.0 nm |
| Light Detector | Silicon photocell |
| Cuvette Type | Round, 24.6 mm diameter |
| Automatic Shut-off | After 15 minutes of inactivity
(30 minutes before a READ measurement) |
| GLP | Date, time of last calibration |
| Logging | Automatic logging of last 50 measurements |
| Display | 128 x 64 pixel B/W LCD with backlight |
| Battery Type | 1.5V AA battery (3 pcs.) |
| Battery Life | > 800 measurements (without backlight) |
| Environment | 0 to 50°C (32 to 122°F); relative humidity: 100% (IP67) |
| Dimensions | 142.5 x 102.5 x 50.5 mm (5.6 x 4.0 x 2.0”) |
| Weight | 380 g (13.4 oz.) |
PRIMARY APPLICATIONS:
The measurement of nitrate in drinking water.
ORDERING INFORMATION:
HI97728C 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.
HI97728 is supplied with cuvettes (2), caps (2), plastic inserts for cuvettes (2), 1.5V AA batteries (3), instruction manual, and instrument quality certificate.
