Water engineers responsible for industrial water and wastewater will find the new single or dual parameter CA-6 UV Family of Spectroscopic Analyzers from Electro-Chemical Devices (ECD) (Anaheim, CA) can monitor any two selected parameters in separate measurement ranges for ammonia, nitrate, or chemical oxygen demand (COD 254 nm). ECD’s CA-6 UV Analyzer Family features:
- An accurate, reliable and economical on-line sampling system that’s designed with UV absorption sensor technology to monitor harmful pollutant parameter levels.
- Sensors available in multiple parameter measurement ranges: Ammonia from 0-10 mg/L or 0 to 1000 mg/L; Nitrate from 0-30 mg/L, 0-100 mg/L, or 0-250 mg/L and COD 254 nm from 0-200 mg/L or 0-20,000 mg/L.
- Availability with either a single parameter or dual parameters in the factory pre-calibrated measurement ranges.
- Ease of installation by connecting the sample, waste and cleaning solution (reagent) lines and powering up the analyzer.
- Access to factory pre-calibrated parameter data or customizing an analysis routine via user-friendly intuitive menus and a touchscreen display.
- Each parameter is analyzed based on the measurement of UV absorption in the sample.
- The absorbance of the solution or gas is measured through a quartz flow cell at a specific wavelength using a long-life Xenon lamp and photo detectors.
- The absorbance level is directly related to the sample concentration according to Beer-Lambert’s Law, which correlates the attenuation of light to the properties of the material through which the light is traveling.
- Accuracy of 5% for the measurement of Ammonia, Nitrate and COD with the CA-6 UV Analyzer based on a sample temperature range of 0 to 80°C, but the sample must be liquid and not frozen.
- Repeatability varies based on the parameter chosen and the single or dual parameter configuration, ranging from 0.15% to 3%.
- 4 alarm relays.
- A single 4-20 mA analog output is included with 12-bit resolution.
- RS232 communications provided for data download to a CSV file, with an optional RS485 MODBUS communication module available.
Ammonia
To measure Ammonia, a reagent is added to the liquid sample and converts the ammonia to gas for measurement by the CA-6’s UV sensor with a fast Fourier transform algorithm that provides a measurement equivalent to the level of Ammonia. A water temperature probe performs automatic temperature compensation for high accuracy.
Nitrate
In measuring the Nitrate found in turbid, organic rich wastewater, the CA-6 UV’s advanced self-cleaning design relies on the strong absorption of UV light by the chromophore N-O, which again is according to Beer-Lambert’s Law. Automatic internal linearization compensates for high concentrations of Nitrate. A second wavelength and detector compensates for dirty matter in the flow cell to ensure high accuracy and reliability.
COD
For the measurement of COD 254 nm, the CA-6’s sensor detects UV light absorption by unsaturated organic molecules at the 254 nm wavelength. COD 254 nm levels in river water and municipal wastewater are closely correlated to the permanganate and dichromate water standard methods. Measurement is extremely responsive, less than 10 seconds and requires no reagents or calibration solutions.
For more information, visit http://www.ecdi.com, or call 800-729-1333.
