The HI96715 Ammonia Medium Range Photometer combines accuracy and ease of use in an ergonomic, portable design. Using the HI93715-01 ready made reagents a user can accurately determine the concentration of ammonia nitrogen in freshwater samples within a 0.00 to 9.99 mg/L (ppm) range. The HI96715 offers many advanced features including the exclusive CAL Check™ function used for performance verification and calibration of the meter.
The HI96715 portable photometer is for the measurement of ammonia nitrogen in freshwater samples. Hanna’s portable photometers feature an advanced optical system; the combination of a special tungsten lamp, a narrow band interference filter, and silicon photodetector ensure accurate photometric readings every time. The Hanna exclusive CAL Check™ feature utilizes ready-made, NIST traceable standards to verify both meter validation and calibration. The exclusive cuvette locking system ensures that the cuvette is inserted into the measurement cell in the same position every time to maintain a consistent path length.
CAL Check™ – Allows for performance verification and calibration of the meter using NIST traceable standards.
GLP – Review of the last calibration date
Auto-shut off – Automatic shut off after 10 minutes of non-use when the meter is in measurement mode. Prevents wastage of batteries in the event the meter is accidentally not turned off.
Battery status indicator – Indicates the amount of battery life left.
Built in timer – Display of time remaining before a measurement is taken. Ensures that all readings are taken at the appropriate reaction intervals for the test being performed.
Error messages – Messages on display alerting to problems including no cap, high zero, and standard to low.
Cooling lamp indicator – To maintain the desirable wavelength to be used for absorbance it is necessary to ensure component are not overheated from the heat generated by the tungsten lamp. Each photometer is designed to allow a minimal amount of time for components to cool. The cooling lamp indicator is displayed prior to a reading being taken.
Units of measure – Appropriate unit of measure is displayed along with reading.
Present naturally in surface and wastewaters, ammonia is largely present from deamination of organic nitrogen-containing compounds and hydrolysis of urea. Ammonia may also be present from water treatment processes that utilize chloramines for disinfection, where ammonia is added to the water to react with chlorine. Ammonia is less likely to appear in groundwater due to adsorption to soil particles.
The HI96715 uses an adaptation of the ASTM Manual of Water and Environmental Technology, D1426-92 Nessler method to measure ammonia-nitrogen concentrations in the 0.00 to 9.99 mg/L (ppm) range. When the Nessler reagent is added to samples containing ammonia, the sample will turn a yellow hue; 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 complementary color, and the emitted radiation is dependent upon concentration. For mid range levels of ammonia, a narrow band interference filter at 466 nm (blue) allows only blue light to be detected by the silicon photodetector. As the change in color of the reacted sample increases, absorbance of the specific wavelength of light also increases, while transmittance decreases.
The HI96715 is available as a kit which includes:
- Portable Photometer
- Sample cuvettes (2)
- Caps (2)
- CAL Check™ standards with certificate
- Cuvette cleaning cloth
- Rugged carrying case
- Thermoformed insert for meter and accessories
*Reagents ordered separately