The Model 360EM measures carbon dioxide CO2 by comparing infrared energy absorbed by a sample to that absorbed by a reference according to the Beer-Lambert law. This is accomplished by using a Gas Filter Wheel which alternately allows a high energy infrared light source to pass through a CO2 filled chamber and a chamber with no CO2present.The light then travels through the sample cell, which has a folded path. The energy loss through the sample cell is compared with the zero reference signal provided by the gas filter to produce an output proportional to concentration, with little effect from interfering gases within the sample.This design produces superior zero and span stability and a high signal-to-noise ratio, allowing excellent sensitivity. Multi-tasking software gives real time indication of numerous operating parameters and provides automatic alarms if diagnostic limits are exceeded.
Specifications:
| Ranges: | 0-4 ppm to 0-4000 ppm full scale, user selectable |
| Units: | Dual, independent, and auto ranging supported ppb, ppm, �g/m3, mg/m3 |
| Zero noise: | < 0.02 ppm |
| Span noise: | < 1.0% of reading above 20 ppm (RMS) |
| Lower Detectable Limit (LDL): | 0.4 ppm |
| Zero drift: | < 1.0 ppm/24 hours, < 2 ppm/7 days |
| Span drift: | < 0.5% of reading/24 hours, < 1% of reading/7 days |
| Lag time: | 10 seconds |
| Rise and Fall Time: | < 60 seconds to 95% |
| Linearity: | 1% of full scale |
| Precision: | 0.5% of reading |
| Sample Flow Rate: | 800 scc/min �1 0% |
