Sensor ~$2,500–3,500, Terminal ~$1,800. 12. Recommendation The IQ Sensor Net ammonium system is suitable for dynamic process control (e.g., aeration optimization, denitrification control) but not for regulatory compliance reporting without parallel lab verification. For low-concentration monitoring (< 0.2 mg/L NH₄⁺-N), a fluorescence-based method or enzymatic sensor is superior.