The RPH-250 Probe-type Residual Analyzer from Hydro Instruments is a high-precision, amperometric chlorine analyzer designed for continuous, real-time monitoring of disinfectants in water treatment. Known for its reliability and response time, the RPH-250 Residual Analyzer ensures accurate measurement of chlorine and other oxidants, helping facilities meet stringent regulatory requirements and maintain safe, high-quality water. As a reagentless on line analyzer, it delivers consistent results with minimal maintenance.
Series RPH-250 Probe-type Residual Analyzer
RPH-250 Probe-type Residual Analyzer
RPH-250 Probe-type Residual Analyzer
Information
Key Features of the RPH-250 Residual Chlorine Analyzer
- Continuous Measurement – Provides ongoing detection of disinfectant levels using amperometric probe technology (not a sample & hold method).
- Multi-Chemical Compatibility – Detects:
- Free Chlorine (functions as a highly accurate free chlorine analyzer)
- Total Chlorine (operates as a reliable total chlorine analyzer)
- Chlorine Dioxide
- Chlorite
- Ozone
- Hydrogen Peroxide
- Peracetic Acid
- Bromine
EPA Compliant – Meets U.S. EPA 40 CFR 141.74 and 40 CFR 141.131, Method 334.0 for on-line chlorine analyzers.
Stable Flow Cell Design – Constant-head, gravity-fed flow cell with bubble trap and cross-flow diverter for consistent, stable readings. Optional pressurized flow cell available, with integration capability for automatic valve control to regulate flow.
Automatic Compensation – pH and temperature compensation available for improved accuracy, making this one of the most advanced amperometric chlorine analyzers on the market.
Control & Communication – Four programmable 4-20 mA outputs, four programmable alarm relays, complete PID control program, and Modbus RS485 communication (Profibus optional). Systems can be paired with an automatic chemical feed valve for precise dosing control.
Optional Enhancements – Data logging with removable MicroSD card, pH probe integration, PRV with pressure gauge.
Durability – NEMA4X (IP66) rated controller for rugged environments.
Performance Specifications
- Measurement Range (Free Chlorine): 0–0.5, 0–2, 0–5, 0–10, 0–20, or 0–200 PPM
- Measurement Range (Total Chlorine): 0–0.5, 0–2, 0–5, 0–10, or 0–20 PPM
- Response Time (T90): ~30 sec (Free Chlorine); ~2 min (Total Chlorine)
- Sample Flow Rate: 4–8 GPH (15–30 L/h) for open flow cell
- Sample Pressure: 5 PSI (0.3 bar) for open flow cell
- Resolution: 0.01 ppm or ±1% of range
- Power Requirements: 100–240 VAC (50/60 Hz) or 12–24 VDC
Why Choose the RPH-250 Probe-type Residual Analyzer?
Residual analyzers like the Series RPH-250 are critical for ensuring precise chemical measurement in applications where water quality, safety, and compliance are essential. From municipal drinking water treatment to food processing and industrial manufacturing, the RPH-250 provides reliable disinfectant monitoring that prevents contamination, improves efficiency, and ensures public health protection. Its reagentless design reduces operator workload and long-term costs, while its amperometric chlorine analyzer method—based on pH and temperature compensation—has become the #1 choice for utilities and industries worldwide.
With over four decades of expertise in gas feed and chemical monitoring equipment, Hydro Instruments has earned a global reputation for building rugged, dependable analyzers that outperform and outlast competitors.
Applications of the Series RPH-250
- Water Treatment & Chlorination (ideal as a continuous free chlorine analyzer)
- Fruit & Vegetable Packing Facilities
- Power Plants & Generation Facilities
- Industrial process water monitoring
- Compliance monitoring for disinfectant residuals using an on line analyzer
Resources & Downloads
- Series RPH-250 Sales Bulletin
- Sales Bulletin F3 – Self Cleaning Probe
- Residual Analyzer Sensor Quick Reference Guide
- MODBUS Communication Manual
For a broader overview of Hydro Instruments’ offerings, see our full line of Residual Analyzers and Analyzers.
Order the RPH-250 Residual Analyzer Today
When precision, compliance, and durability matter most, the RPH-250 Residual Chlorine Analyzer delivers unmatched performance. Contact Hydro Instruments to request a quote, or explore the top benefits of chlorination for water treatment to learn more about how our systems protect water quality worldwide.
FAQs: Series RPH-250 Residual Analyzer
What is the RPH-250 Probe-type Residual Analyzer used for?
The RPH-250 is a reagentless on line analyzer designed for continuous monitoring of disinfectants in water systems. It functions as a free chlorine analyzer, total chlorine analyzer, and multi-chemical monitor, ensuring compliance and safety in water treatment and industrial processes.
Is the RPH-250 Residual Chlorine Analyzer EPA compliant?
Yes. The Series RPH-250 meets U.S. EPA Method 334.0 requirements for on-line chlorine analyzers, making it suitable for regulatory monitoring of municipal drinking water systems.
What chemicals can the Series RPH-250 detect?
This versatile amperometric chlorine analyzer can measure free chlorine, total chlorine, chlorine dioxide, chlorite, ozone, hydrogen peroxide, peracetic acid, and bromine. Its reagentless probe design ensures accurate detection with minimal maintenance.
How does the RPH-250 ensure accurate chlorine measurement?
The analyzer uses advanced amperometric probe technology with pH and temperature compensation, along with a constant-head flow cell and bubble trap. This design has made it one of the most reliable amperometric chlorine analyzers available today.
What output and communication options does the RPH-250 provide?
The unit includes four programmable 4-20 mA outputs, Modbus RS485 communication, alarm relays, and optional data logging. It can also be integrated with an automatic chemical feed valve for precise process control.
Where is the RPH-250 typically installed?
The RPH-250 Residual Analyzer is commonly installed in municipal water treatment plants, food and beverage processing facilities, power generation plants, and industrial water systems—anywhere a reagentless free chlorine analyzer or total chlorine analyzer is required.
