Description
Ammonia exists in two forms in water: ammonium (NH4⁺) and ammonia gas (NH3), with pH determining which form predominates. At pH levels below 8, ammonium is the dominant form, while higher pH levels shift equilibrium toward ammonia, which is more toxic to aquatic life. Monitoring ammonia is critical in environmental waters, aquaculture, wastewater, and drinking water treatment, where small concentrations may be intentionally added to enhance chlorination efficiency. The HI97700 measures low-range ammonia (0.00–3.00 mg/L NH3-N) using the ASTM D1426 Nessler method and can display results as ammonia or ammonium.
The meter features an innovative optical system consisting of a 420 nm LED, 8 nm narrow band interference filter (±1 nm accuracy), reference detector, and focusing lens for superior measurement stability and reduced cuvette errors. Its backlit 128 x 64 pixel dot matrix LCD includes virtual keys, GLP tracking, automatic logging of the last 50 readings, and tutorial mode for guided operation. Built with a fully waterproof housing, gasket-sealed battery compartment, and 25 mm round cuvette holder, the HI97700 delivers laboratory-grade precision in a compact, portable design.
