Nitrite Low-Range Portable Photometer with CAL Check – HI97707

Description

Nitrites can be harmful to aquatic organisms even in low concentrations and for this reason, they are closely monitored in aquaculture facilities. In cooling towers, however, an adequate amount of nitrites is necessary to prevent corrosion. In high concentrations, they can be harmful to the environment and to humans. They are, therefore, normally monitored to verify the quality of water for domestic use, as well as lakes and ponds.

Nitrites are an intermediate product in the nitrogen cycle and are produced by ammonia oxidation with water, or even originate in industrial waste directly. They must not be present in drinking water.

The HI97707 uses an adaptation of the EPA approved Diazotization method 354.1 to measure nitrite concentrations in the 0to 600 µg/L (ppb) range. When the reagent is added to samples containing nitrite, the sample will turn a pink tint; the greater the concentration, the deeper 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 complimentary color, and the emitted radiation is dependent upon concentration. For low levels of nitrite, a narrow band interference filter at 466 nm. As the change in color of the reacted sample increases, absorbance of the specific wavelength of light also increases, while transmittance decreases.

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

Multiple Chemical Forms
Results can be displayed in multiple chemical forms.

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

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

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

HI97707 FEATURES/BENEFITS:

Stable Light Source:

The internal reference system of the HI97707 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.

Large Cuvette Size:

The sample cell of the HI97707 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 HI97707 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.

Additional information

Weight	0.91 kg
Parameter	Nitrite

Specifications

SKU	HI97707-web
Name	Nitrite Low-Range Portable Photometer with CAL Check – HI97707
Nitrite Range	0 to 600 µg/L (as NO₂–-N)
Nitrite Resolution	1 µg/L
Nitrite Accuracy	±20 µg/L ±4% of reading at 25°C
Nitrite Method	adaptation of the EPA Diazotization Method 354.1
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 in.)

Ordering Info

HI97707C 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.
HI97707 is supplied with cuvettes (2), caps (2), plastic inserts for cuvettes (2), 1.5V AA batteries (3), instruction manual, and instrument quality certificate.