QX/T 509-2019 in English
VALIDSpecifications for GRIMM 180 particle concentration monitor calibration
- Issued on:2019-09-30
- Implemented on:2020-01-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$204.00
本标准规定了GRIMM 180颗粒物浓度监测仪标校的仪器原理与构成、技术指标、条件、方法和周期。本标准适用于GRIMM 180颗粒物浓度检测仪的首次标校、后续标校及修理后的标校。
Introduction
Technical background and evolution of the standard
This standard is a supporting specification for QX/T173-2012 and is formulated for the particularity of the GRIMM180 series monitors. The 2019 version adds requirements for dynamic adjustment of laser voltage and coordinated calibration of multi-channel thresholds, reflecting the development trend of aerosol measurement technology from single mass concentration to number concentration-particle size spectrum joint analysis.
Comparative analysis of core calibration indicators
| Parameter type | Allowable error | Calibration method | Key equipment |
|---|---|---|---|
| PM10/PM2.5/PM1 mass concentration | ±3μg/m³ or ±5% | Threshold synchronization method | Calibration tower + standard particles |
| Particle number concentration | ±5% | Channel comparison method | Polydisperse standard particles |
| Sampling flow | ±5% set value | Serial calibration method | Standard flowmeter |
| Laser voltage | ±2.5% deviation | Dual-channel balance method | Optical power meter |
Key steps in calibration
7.2.6 Flow calibration case
During calibration at a provincial station, it was found that the flow indication was 1.30L/min, which was out of the range of 1.14-1.26L/min. According to the standard:
- Use 0.5-level standard flowmeter for serial verification
- Adjust the pump voltage to stabilize the measured value at 1.20L/min
- Re-perform airtightness test (pressure drop ≤0.002MPa/20s)
7.3.4 Key points for effectiveness verification
Must meet the following requirements at the same time
- 15 minutes of continuous data Correlation coefficient R²≥0.95
- PM2.5 channel Relative standard deviation <2%
- When the number concentration is 1000/cm³, Synchronization error ≤3%
Solutions to common problems
| Fault phenomenon | Possible cause | Handling measures |
|---|---|---|
| PM10 indication drift | Optical mirror contamination | Clean the reflector according to 7.2.2.6 |
| Flow fluctuation＞5% | Gas leakage | Perform airtightness check according to 7.2.3 |
| Laser voltage abnormality | LD aging | Recalibrate after replacing the laser module |
Standard implementation suggestions
1. Establish calibration files: Completely record the threshold parameters, environmental conditions, operators and other information of each calibration (see Appendix A)
2. Quality control chart: Draw a long-term calibration deviation control chart for the PM2.5 channel and set a ±2σ warning line
3. Periodic verification: Perform a quick comparison test of 7.2.5 every 3 months during the calibration cycle
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