Product details
Online Residual Chlorine Analyzer — DPD or Amperometric
The InstroDirect IDOA-FCL Residual Chlorine Online Analyzer is a continuous online residual chlorine analyzer with two method options: DPD colorimetric (reagent-based, regulatory-grade accuracy) or amperometric (reagent-free, low-maintenance). Both provide continuous data on RS485 Modbus for drinking water compliance, WWTP UV/chlorine polishing step control, and cooling water biofilm management.
Technical Specifications
| Parameter | Specification |
|---|---|
| Method (specify) | DPD colorimetric or amperometric (3-electrode) |
| Measurement range | 0 – 5 mg/L (standard) or 0 – 20 mg/L (extended) |
| Accuracy | ±0.03 mg/L or ±3% |
| Chlorine species | Free, combined, or total (specify) |
| Measurement cycle | 2.5 minutes (colorimetric) / continuous (amperometric) |
| Output | RS485 Modbus RTU + 4–20 mA + chlorine-low relay alarm |
| Power | 240 VAC |
| Enclosure | IP54 indoor / IP65 outdoor |
| Warranty | 12 months |
Typical Australian Applications
- Drinking water distribution network residual chlorine compliance
- WWTP disinfection polishing step monitoring
- Cooling water biofilm and legionella control
- Aquatic centre and swimming pool chlorine regulation
- Food & beverage CIP sanitiser verification
- Healthcare facility potable water monitoring
Why Choose InstroDirect for Online Water Analyzers
- Choice of method fits the application — DPD for compliance, amperometric for low-maintenance continuous monitoring
- Integrates with the InstroDirect Free Chlorine Monitoring Panel for a complete multi-parameter solution
- AU-stocked DPD reagents and amperometric electrodes
- Annual service contract options include reagent top-ups and calibration
- Alarm output can trigger chlorinator dosing or SCADA alerts
Installation, Commissioning & Service
Sample line at 100 mL/min from the distribution main or reservoir sample tap. 240 VAC power, RS485 Modbus link. InstroDirect handles on-site commissioning, first calibration, and SCADA integration. Consider pairing with the IDFCP-1 Free Chlorine Panel for combined compliance monitoring.
Frequently Asked Questions
Free, combined, or total chlorine — what is the difference?
Free chlorine (HOCl + OCl-) is the active disinfectant. Combined chlorine (chloramines) forms when chlorine reacts with ammonia — still active but weaker. Total = free + combined. Specify which you need when ordering; the analyzer ships calibrated for that method.
Is the amperometric version reagent-free?
Yes for the measurement itself. The amperometric electrode eventually consumes its electrolyte (12–18 months) and the membrane is a consumable every 6–12 months. Both stocked in Brisbane.
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.
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