QX/T 273-2015 in English
VALIDMonitoring method for atmospheric carbon monoxide concentration. Gas filter correlation
- Issued on:2015-07-28
- Implemented on:2015-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$505.00
Introduction
Analysis of the core content of the standard
| Technical elements | QX/T 273 requirements | Comparison with international standards (ISO 4224) |
|---|---|---|
| Lower limit of detection | 0.05 μmol/mol | 0.1 μmol/mol |
| Calibration period | ≤3 months | ≤6 months |
| Sampling height | Near the ground layer (≤10m) | Not clearly defined |
Key technical principles
The infrared gas filter correlation analyzer is used to alternately generate reference/measurement beams by rotating the filter, and the concentration is measured by utilizing the characteristic absorption of 4.6μm infrared light by CO molecules. The system needs to meet the following requirements:
- Light source stability: fluctuation <±1%
- Temperature control: 10-30℃±5℃
- Sampling flow rate: ≥0.2L/min
Implementation points
Installation specifications
Sampling port needs to meet the following requirements:
- Horizontal distance from pollution source > 10 times the obstacle height
- Height of building roof for sampling is 1.5-2m
- Intake pipe is made of polytetrafluoroethylene
Quality control
| Item | Frequency | Allowance deviation |
|---|---|---|
| Zero check | Every 6 hours | <0.05 μmol/mol |
| Span check | Daily | Range 80%±5% |
| Filter replacement | 2 weeks/time | Pressure drop<0.5kPa |
Background of standard evolution
This standard refers to the requirements of the WMO Global Atmosphere Watching Program (GAW) and adds the following to ISO 4224:
- Installation specifications under typical environments in China
- Special treatment in areas with high particulate matter concentration
- Metadata recording system
Typical application cases
A provincial meteorological station uses the GFC-1000 analyzer to implement the following standards:
- Establish a traceability chain through WMO standard gas
- Use 5-point calibration (0/30/60/120/200 μmol/mol)
- Correlation coefficient r²>0.9998
- Annual data integrity rate reaches 98.7%

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