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: 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.
Let us know your range as we can range the machine with reagents and calibration to your need so let us know.
Technical Specifications
| Parameter | Specification |
|---|---|
| Measurement parameters | Nitrate, pH, temperature |
| Measurement method | Ion Selective Electrode Method |
| Range | Nitrate nitrogen: 0.1 – 1000 mg/L; pH: 0 – 14; Temperature: 0 – 60 °C |
| Accuracy | ≤ ±3% |
| Repeatability | ≤ 2% |
| Resolution | Nitrate nitrogen: 0.01 mg/L; pH: 0.01 |
| Detection limit | 0.1 mg/L |
| Response time | ≤ 60 s |
| Zero drift / quantity drift (24 h) | ≤ ±3% F.S. |
| Calibration cycle | 3 months |
| Temperature range | 0 – 60 °C |
| Protection level | IP68 |
| Communication | RS485 Modbus RTU, max baud 115200 bps |
| Power supply / Consumption | 12 / 24 VDC, < 0.5 W |
| Material | Stainless steel, POM |
| Weight / Size | 0.6 kg / 205 mm × Φ 45 mm |
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. 24 Dc 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.
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
- 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.
Why InstroDirect vs Endress+Hauser or HACH in Australia
InstroDirect supplies the same grade of water-quality sensor that Australian councils, WWTP integrators, pharma plants, and food & beverage operators specify from Endress+Hauser and HACH — at a significantly lower landed cost and without vendor lock-in.
| Factor | InstroDirect | Endress+Hauser / HACH |
|---|---|---|
| Digital protocol | Open RS485 Modbus RTU — integrates with Allen-Bradley, Siemens, Schneider, Beckhoff, or any SCADA | Proprietary (E+H Memosens / HACH SC digital) — locked to the vendor’s transmitter |
| Technical support | Australian field engineers with 20+ years automation experience | Remote support via offshore ticket queues |
| On-site calibration | InstroDirect technicians available across QLD, NSW, VIC with formal calibration certificate | Third-party authorised service network, longer turnaround |
| Price | Parallel-import model — no distributor margin stack, typically 30–50% below equivalent brand pricing | Premium brand pricing with tiered distributor markup |
| Replacement parts | Standard consumables ordered on demand from InstroDirect | Proprietary cartridges and cells, tied to the brand |
Moving away from Memosens or SC digital protocols frees you to mix and match sensors with any Modbus-capable transmitter or PLC. InstroDirect probes drop straight into an existing control system without a new proprietary transmitter.
