The sensors utilize “plastic films” that respond with easily visible color changes at the ammonia concentrations important in aquatic systems (fresh and/or saltwater), and can be immersed long-term. Kept in water, the sensors enable the ammonia to be readily determined at any time. The measurement is simply made by matching the sensor color against a reference chart, or using automated optical instrumentation. The sensor film was specially designed to detect NH3 at extremely low concentrations, thereby offering the best protection of the most sensitive aqua systems. Range and sensitivity can be customized for optimal surveillance to meet any application-specific requirements. The sensors are also not damaged by being removed from liquid solutions and reintroduced- even after prolonged periods of time.
The gaseous ammonia sensors utilize similar, but different “plastic films” that likewise respond with easily visible color changes at the ammonia concentrations important in gas/air environments. As in the case with the aquatic ammonia sensors, the gaseous ammonia sensors can also be modified to be a higher or lower sensitivity. Currently our Ammonia Gas Sensors are predominantly used in the controlled atmosphere storage industries with apple and other fruit storage as one such application.