QX/T 581-2020 in English
VALIDPortable Three-cup Anemometer
- Issued on:2020-11-05
- Implemented on:2021-02-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
Introduction
Analysis of the core content of the standard
This standard specifies two types of portable three-cup wind direction and speed meter: pointer type and digital display type. Its core performance requirements include:
| Parameter category | Pointer type requirements | Digital display requirements |
|---|---|---|
| Wind speed measurement | The pointer tip covers the 1/2-3/4 scale line | The digital display is stable and has no jumps |
| Starting wind speed | ≤0.8m/s (unified requirements) | |
| Error calculation | ±(0.5+0.02v)m/s (v is the actual value) | |
Detailed explanation of key technical indicators
1. Environmental adaptability
The instrument needs to pass four rigorous tests: -40℃ low temperature, +50℃ high temperature, cyclic damp heat (40℃/92-98%RH) and 48 hours salt spray test to ensure normal operation under extreme conditions.
2. Wind speed measurement principle
The air velocity calculation formula provided in Appendix A is used:
v=Kv₁=K×1.278√Pv
The correction coefficient K needs to comprehensively consider parameters such as temperature, humidity, and air pressure.
Implementation suggestions and precautions
Key points of production quality control
- Wind cup assembly: ensure smooth rotation and horizontal position balance
- Pointer calibration: zero return offset ≤1/5 scale, wind direction pointer and wind vane on the same plane
- Protection treatment: joint sealing test, functional verification after salt spray test
Acceptance test process
- Use QX/T84 compliant wind tunnel for wind speed calibration
- Verify point by point according to the 7 test points (2m/s to 30m/s) specified in 6.2.1.3
- Wind direction test requires ±22.5° error check on the 16-azimuth dial
Standard Evolution and Industry Value
Compared with the earlier version, QX/T581-2020 mainly strengthens: power supply stability of digital display instruments (±10% voltage fluctuation test), environmental adaptability index (newly added alternating damp heat cycle) and detailed inspection rules (clarified A/B/C three groups of inspection processes). This standard provides a reliable technical basis for portable measurement tools in the fields of meteorological observation, environmental monitoring, etc.
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