NH4D sc Ammonium Sensor With CARTRICAL™ Technology DatasheetSource: Hach Company
The Hach NH4D sc Ammonium Sensor uses an ion-selective electrode (ISE) to detect ammonium ions (NH4+) directly in the aeration basin as ammonium nitrogen (NH4-N). A pHD (differential pH) electrode is used as the reference electrode for superior stability. The most significant potential interference is from potassium ions (K+) which is compensated through the use of an integrated potassium ISE to correct the ammonium value. Potential interferences are further reduced using CARTRICAL technology. CARTRICAL calibrates each electrode individually and calibrates all three electrodes to each other. A temperature sensor is also included to improve accuracy.
The NH4D sc sensor is designed for immersion directly in the aeration basin eliminating the need for sample preparation. It installs quickly outdoors without special housing. The sensor can easily be relocated to various locations for greater knowledge about the process.
The NH4D sc sensor uses a calibrated sensor cartridge that should be replaced approximately twice a year (in typical operating conditions). No electrolyte or reagents to change. Cartridge replacement only takes minutes—just remove the old cartridge, plug in the new, and enter the sensor code. Maintenance is also minimized because sample pumps, valves, tubing, or filtration devices are not needed.