Product details
Online Nitrate Nitrogen (NO3-N) Analyzer
The InstroDirect IDOA-NO3 Nitrate Nitrogen Online Analyzer is a continuous online nitrate analyzer available in two measurement method variants: cadmium-reduction colorimetric (for the highest accuracy and regulatory compliance) and UV absorption (reagent-free, for continuous environmental trending). Both report NO3-N on RS485 Modbus with full data logging.
Technical Specifications
| Parameter | Specification |
|---|---|
| Method (specify) | Cadmium reduction colorimetric or UV absorption (205 / 254 nm) |
| Measurement range | 0 – 100 mg/L NO3-N (extended range 0 – 500 mg/L optional) |
| Detection limit | 0.05 mg/L (colorimetric), 0.2 mg/L (UV) |
| Accuracy | ±5% |
| Measurement cycle | 15 minutes (colorimetric) or continuous (UV) |
| Output | RS485 Modbus RTU + 4–20 mA |
| Power | 240 VAC |
| Enclosure | IP54 indoor / IP65 outdoor |
| Warranty | 12 months |
Typical Australian Applications
- Drinking water nitrate compliance monitoring (AU limit 11 mg/L NO3-N)
- WWTP effluent environmental discharge compliance
- Catchment and river nitrate loading studies
- Agricultural runoff monitoring
- Aquaculture recirculating system water quality
- Groundwater bore and aquifer monitoring
Why Choose InstroDirect for Online Water Analyzers
- Choose reagent-free UV method for low-maintenance environmental monitoring, or colorimetric for regulatory-grade accuracy
- Dual-range firmware covers both drinking water (<11 mg/L) and effluent (>50 mg/L)
- InstroDirect stocks both cadmium-reduction reagents and UV lamp replacements
- Integrates with the IDOA-NO2 nitrite analyzer on a shared service contract
- Local calibration standards available in AU
Installation, Commissioning & Service
Sample line at 100 mL/min. 240 VAC power, RS485 Modbus link to SCADA. InstroDirect handles on-site commissioning and can tune the control loop outputs for integration with denitrification or dosing systems.
Frequently Asked Questions
UV or colorimetric — which should I choose?
UV is reagent-free and suits continuous environmental monitoring where trending matters more than the last decimal. Colorimetric is the regulatory reference for drinking water compliance. We can quote either or both — clarify your application when ordering.
Is cadmium reduction safe to operate?
The cadmium reagent is contained in a sealed cartridge that only qualified service technicians swap out. Spent cartridges are collected by InstroDirect for proper disposal.
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.