EC9830T CO trace analyzer - Ecotech - #1

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EC9830T Trace Carbon Monoxide Analyser The Ecotech Model EC9830T Carbon Monoxide (CO) analyser incorporates Gas Filter Correlation (G.F.C.) technology with infra red photometric detection. The analysers sensitivity has been increased with the number of passes increased from 20 to 28. Detection of sub-ambient levels of CO is made challenging due to interference by H2O and CO2. The use of GFC technology minimises this interference and enables the instrument to measure CO in ambient air in the range of 0- 20,000ppb. CO background (trace) measurements in ambient air are usually made in the range of 25-350 ppb (levels that represent the range of global CO mixing ratios in the unpolluted atmosphere). Heated Hopcalite® scrubbers are used to convert CO to CO2 . Additional external scrubbers can also be used on sites that are heavily polluted. Features • EC9830T is U.S. EPA approved (Automated Reference Method RFCA-0992-088). • Water is removed from the sample gas through the use of a permeation dryer. The dryer reduces sample gas dew point to -30ºC thereby reducing water interference to <2ppb in the sample. • Sample gas concentration measurements are automatically corrected for temperature and pressure changes and can be displayed in units of ppb, ppm, ìg/m3 or mg/m3. • Each analyser incorporates a 12 hour 25ppb zero drift function which utilises a custom calibrated fifth order polynomial to make corrections over the range of 0 – 3000 ppb with linearity of < ±5%. • Fast response and high signal to noise ratio is achieved through the use of a low noise IR detector. • Up to 100 backgrounds (zero) can be stored for diagnostic purposes. • Calibration curves are used to ensure that a linear signal output is achieved over two wide concentration ranges: 0-5000ppb and 5000- 20,000 ppb. • Analyser firmware is user upgradeable via USB or RS232 ports. • Operating temperature range is 20 - 30ºC with stability of ±5ºC. If the internal temperature of the instrument changes by more than ±4ºC then an automatic background is undertaken. • Auto-zero routine allows the analyser to periodically check and correct for background illumination thereby virtually eliminating zero drift. • High sensitivity is achieved by the use of a 6m path length cell. • Kalman digital filter continuously provides the best compromise between response time and noise reduction.