Here's how the flue gas tester is measured.
1. On-line UV flue analyzers must be preheated for more than 30 minutes each time (because the gas chambers and spectrometers within the smoke detector have heating functions);
CEMS on-line smoke monitoring system
2. After preheating the flue gas detector, a zero-point calibration is carried out for each use. (Zero-point calibration is performed for self-pumpable air, but zero-point calibration is required for nitrogen at the metering facility);
3. During the measurement check, the flow of flue gas analyzers is controlled at approximately 3 L/minutes and is stable. (Perfect on-site, controlled at 1-1.5 L/min);
4. A zero-point calibration shall be carried out following a change in the pneumatic range of the pneumatic analyzer.
5. The flue gas detector is optimized at the factory. If the deviation is very small, span calibration is unnecessary.
For scale calibration, note that in choosing the range 0-1000 mg, the standard gas calibration of SO2 (600-900) should be based on approximately 500 mg; Avoid calibration of nitrogen oxides with a standard gas above 700 mg (with a standard gas of about 400 and 500 mg more appropriate). When choosing a range of 0-200 mg, it is more appropriate to calibrate nitrogen monoxide and sulfur dioxide with a standard gas of more than 150 mg.
7. NO has a large bias over 700 mg (this flue gas analyzer applies to low concentration measurements, 1000 mg is extended and prone to deviations). Use 800-850 mg standard gas segment to calibrate nitrogen monoxide.