銨離子選擇電極
專門測量0.1ppm至飽和（5x10-6M至飽和）濃度的NH4。相關應用包括鍋爐給水，天然水，肥料等。
可用於氨氮(NH3-N)的測量
儀器需求：可使用現有pH計搭配半對數圖作線性回歸測量；或是包含可量測各類離子功能的進階pH計(或稱離子計)。
| Model # | NH41502 |
| Slope | 55 ± 3 mV between 10-100 ppm @ 25°C |
| Reproducibility | ± 2% |
| Interferences | K+1 |
| Temperature Range | 0 to 40° C (if calibrated at that temperature) |
| Pressure Range | 0 to 30 psi |
| Response Time | 95% response in 30 seconds |
| Storage | Long term, store dry Short term, store in dilute ammonium standard |
| Concentration Range | 0.1 ppm to Saturated (5 x 10-6 M to Saturated) |
| pH Range | 4 to 10 pH |
| Resistance | 100 megaohms |
| Care, Maintenance & Cleaning | Treat with distilled water followed by ammonium standard |
| Isopotential Point | 10 ppm |
| On-Line Capability | Yes |
| Applications | Boiler Feed Water, Natural Waters, Fertilizers |