Electro-Chemical Devices CA-6 UV Spectroscopic Analysers

The CA-6 UV Family of Spectroscopic Analysers from Electro-Chemical Devices (ECD) can monitor any two selected parameters in separate measurement ranges for ammonia, nitrate or chemical oxygen demand (COD 254 nm).

The analysers provide accurate, reliable and economical online sampling with UV absorption sensor technology to monitor harmful pollutant parameter levels. The sensors are available in multiple parameter measurement ranges: ammonia from 0–10 mg/L or 0–1000 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.

Each model can be ordered with either a single parameter or dual parameters in the factory precalibrated measurement ranges. Each parameter is analysed 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 travelling.

Accuracy is 5% for the measurement of ammonia, nitrate and COD 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%.

The analyser is designed with four alarm relays.  A single 4–20 mA analog output is included with 12-bit resolution. RS232 communications are provided for data download to a CSV file, with an optional RS485 MODBUS communication module available.