Product details
Online Nitrite Nitrogen (NO2-N) Analyzer
The InstroDirect IDOA-NO2 Nitrite Nitrogen Online Analyzer is a continuous online nitrite nitrogen analyzer using the Griess-Ilosvay colorimetric method. Nitrite is a key intermediate in biological nitrification and a regulated parameter in drinking water and aquaculture, where high NO2-N levels indicate process failure or toxic conditions.
Technical Specifications
| Parameter | Specification |
|---|---|
| Method | Griess-Ilosvay (sulphanilamide / N-1-naphthylethylenediamine) colorimetric |
| Measurement range | 0 – 10 mg/L NO2-N |
| Detection limit | 0.01 mg/L |
| Accuracy | ±5% or ±0.02 mg/L |
| Measurement cycle | 15 minutes (configurable) |
| Reagent consumption | ~500 mL per reagent per month |
| Output | RS485 Modbus RTU + 4–20 mA |
| Power | 240 VAC |
| Enclosure | IP54 indoor / IP65 outdoor (specify) |
| Warranty | 12 months |
Typical Australian Applications
- Drinking water nitrite compliance (AU drinking water limit 0.9 mg/L NO2-N)
- WWTP nitrification stage monitoring
- Aquaculture toxicity early warning (nitrite is highly toxic to fish)
- Industrial cooling water nitrite corrosion inhibitor dosing
- Food & beverage ingredient water QA
Why Choose InstroDirect for Online Water Analyzers
- Continuous online replaces labour-intensive lab grab sampling
- Griess-Ilosvay is the regulatory reference method for potable water
- Very low detection limit (0.01 mg/L) suits drinking water compliance
- Automated zero/span checks ensure ongoing data integrity
- Fully reagent-based — no sensor replacement every 12 months
Installation, Commissioning & Service
Sample line at 100 mL/min from a representative point. 240 VAC power, RS485 Modbus link to SCADA. InstroDirect provides on-site commissioning and can integrate the alarm outputs into existing chlorination or aeration control loops.
Frequently Asked Questions
How does nitrite relate to nitrate?
Nitrite (NO2-N) is an intermediate. Ammonia is oxidised to nitrite (by Nitrosomonas bacteria) then nitrite to nitrate (by Nitrobacter). Elevated nitrite indicates incomplete nitrification — a diagnostic signal in WWTPs and aquaculture.
Can I combine this with a nitrate analyzer?
Yes. The IDOA-NO3 nitrate analyzer uses a complementary method and the two analyzers share the same platform, reagent stock, and service contract.
Australian Technical Support, Calibration & Consumables
- Brisbane-based technical support from field engineers with 20+ years automation experience
- On-site commissioning and calibration service across QLD, NSW, VIC with formal certificate
- Full reagent range stocked locally — no waiting 6 weeks for shipping
- Annual service contracts for councils, water utilities, and industrial clients
- Trade pricing for system integrators, water utilities, and environmental consultancies
Request a Quote
Online analyzers are project-priced based on configuration, reagent volume, and service requirements. Contact InstroDirect for a detailed quote including installation, commissioning, reagent supply, and annual service options.
There are no reviews yet.