The CL-7687 Dissolved Ozone Monitor delivers accurate, consistent, and reliable ozone monitoring and control for aqueous ozone applications. Designed with a potentiostatic sensor and overflow flowcell, this system ensures precise ozone measurements across a wide concentration range, from ppb-level detection up to 200 ppm.
With integrated relays, analog output, and a clear display, the CL-7687 is ideal for water treatment, food processing, research, and other applications that require continuous ozone measurement and control.
Measurement Ranges
The CL-7687 offers four user-selectable measurement ranges, adjustable via the front display panel:
- 0–200 ppb (1 ppb resolution)
- 0–2.00 ppm (0.01 ppm resolution)
- 0–20.0 ppm (0.1 ppm resolution)
- 0–200 ppm (1 ppm resolution)
This flexibility allows the CL-7687 to adapt to applications ranging from ultra-low detection needs to high-concentration ozone water systems.
Potentiostatic Measurement Technology
The CL-7687 uses the potentiostatic amperometric method, which maintains a constant electrode potential via two metal electrodes and a reference electrode. Unlike traditional amperometric sensors, this design provides:
- Linear current-to-concentration relationship
- Stable zero readings with reduced drift
- Reduced need for frequent recalibration
Because the ozone present in water is consumed during measurement, a continuous flow of fresh water is required. The integrated flowcell ensures consistent water movement across the sensor for accurate, repeatable results.
Flowcell Design
The included overflow-style flowcell regulates pressure and maintains stable conditions around the sensor. This guarantees accurate ozone readings regardless of changes in system water pressure.
- Flow rate: 2.6–8 gallons per hour
- Sample drain: Overflow design sends excess water to drain
- Mounting flexibility: Sensor supplied with 10 ft (3 m) cable; water sample can be drawn up to 30 ft via ¼” OD Teflon tubing
Additional Features
- Relays & Outputs: Two user-configurable relays for process control and a 4–20 mA analog output scaled to your selected range
- Optional Temperature Probe: Simultaneously display real-time water temperature alongside dissolved ozone readings
- No Consumables: The potentiostatic sensor requires no replacement membranes or electrolyte solutions
- Calibration: Performed onsite using a colorimetric dissolved ozone test kit for maximum accuracy in the actual process environment
Calibration Notes
Calibration frequency depends on water quality and ozone concentration:
- Low-level ozone (<1 ppm): Verify zero frequently (daily for poor water quality)
- High-level ozone (>1 ppm): Monthly calibration often sufficient for clean water
Recommended colorimetric calibration kits include:
- I-2022 SAM Dissolved Ozone Meter – Best for low-level detection below 0.75 ppm
- I-2019 SAM Dissolved Ozone Meter – Ideal for high-level detection up to 5.0 ppm
Applications
The CL-7687 Dissolved Ozone Sensor with Flowcell is suited for:
- Municipal and industrial water treatment
- Food and beverage processing
- Cooling towers
- Pharmaceutical and biotech facilities
- Aquaculture and research applications
Why Choose the CL-7687?
By combining advanced potentiostatic technology with a carefully engineered flowcell, the CL-7687 ensures accurate, stable, and long-term dissolved ozone measurements. With wide range flexibility, simple calibration, and robust integration options, it is a dependable solution for both critical process monitoring and regulatory compliance.
You can find this product here: https://www.gas-sensing.com/cl-7687.html
