氮氧化物離子選擇電極
專門測量0.2 ppm至220 ppm（5x10-6 M至5x10 -3 M）濃度的NOx。
應用包括：空氣，煙氣等。
| Model # | NOX1501 |
| Slope | 56 ± 3 mV between 10-100 ppm @ 25°C |
| Reproducibility | ± 2% |
| Interferences | SO2, HF, acetic acid |
| Temperature Range | 0 to 50° C (if calibrated at that temperature) |
| Pressure Range | 0 to 10 psi |
| Response Time | 95% response in 30 seconds |
| Storage | Long term, store dry Short term, store in nitrogen oxide standard with ISA added |
| Concentration Range | 0.2 ppm to 220 ppm (5 x 10-6 M to 5 x 10-3 M) |
| pH Range | 1.1 to 1.7 pH |
| Resistance | 1000 to 1500 megaohms |
| Care, Maintenance & Cleaning | Treat with a dilute nitrogen oxide standard with pH adjusted to 1.1 - 1.7 Replace membrane as needed |
| Isopotential Point | Unknown |
| On-Line Capability | Yes, pH control required |
| Applications | Air, Stack Gases |