QX/T 219-2013 in English

VALID

Technical requirements for metrology laboratory of air speed

Issued on:2013-12-22
Implemented on:2014-05-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $120.00
$117.00

Standard No:	QX/T 219-2013
Document status:	VALID
Title in English:	Technical requirements for metrology laboratory of air speed
Title in Chinese:	空气流速计量实验室技术要求
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2013-12-22
Implemented on:	2014-05-01
Professional Classification:	QX-Meteorology
Related Keywords:	air speed introduction standard overview metrology laboratory professional technical standard technical requirements first-class standard requirements
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Introduction

Standard Overview and Technical Background

QX/T 219-2013 is a professional technical standard formulated by my country's meteorological industry for air velocity measurement laboratories, which was issued in December 2013 and officially implemented in May 2014. This standard fills the gap in the construction specifications of meteorological wind tunnel laboratories and provides unified laboratory technical requirements for the measurement and calibration of meteorological instruments such as wind velocity sensors.

Analysis of core technical requirements

1. Infrastructure specifications

Project	Recirculation wind tunnel	Direct current wind tunnel
Spatial spacing	Tunnel distance to wall ≥1m	Air outlet distance to wall ≥2 times of air inlet diameter
Functional isolation	Laboratories are prohibited from being used for other purposes. Direct current wind tunnels require independent control rooms
Power supply system	Dual power supply isolation (220V/380V), UPS capacity ≥ 2 times the load

2. Environmental control indicators

Temperature and humidity: 15-30℃, ≤85%RH
Noise: ＜85dB at 1m from the test section (in line with GB 3096-2008)
Illumination: 500lx (refer to GB 50034-2004)

Metrology standard classification system

Grade	Wind speed range (m/s)	Uncertainty (1-12m/s)	Uncertainty (＞12m/s)
First-class standard	0.2-80	0.08m/s(k=2)	0.62%(k=2)
Second-class standard	0.2-30	0.15m/s(k=2)	1.24%(k=2)

Application Case: Wind Tunnel Laboratory Reconstruction

A provincial meteorological metrology station referred to this standard to convert the original The class=instrument>DC wind tunnel laboratory was upgraded:

An independent control room was added to achieve human-machine separation
A dual-channel UPS system was installed to ensure the power supply of the standard instrument
A foam fire extinguishing system was used to replace the traditional dry powder fire extinguishing

After the transformation, the laboratory passed the CNAS certification, and the expanded uncertainty reached the first-class standard requirements.

Suggestions for the implementation of the standard

1. Matters needing attention during the construction phase

The wind tunnel selection should be combined with QX/T 8-2007 "Meteorological Low-speed Wind Tunnel Performance Test Specification"
The power supply system must comply with the voltage deviation requirements of GB/T 12325-2008
Grounding resistance <4Ω (refer to GB 50169-2006)

2. Key points for daily operation and maintenance

Regularly calibrate environmental measuring instruments (temperature meter tolerance ±0.35℃, humidity meter ±5%RH)
Test the noise level every quarter (GB 22337-2008)
Establish a power supply system inspection system

More samples: JGJ 94-2008 JJG 21-2008 YD/T 3934-2021

Sample only — not a preview of QX/T 219-2013

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