DL/T 1985-2019 in English

VALID

Determination of mining ratio of SF6 gas mixture

Issued on:2019-06-04
Implemented on:2019-10-01
File Format:PDF
Delivery:Via email within 1~3 business days

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Standard No:	DL/T 1985-2019
Document status:	VALID
Title in English:	Determination of mining ratio of SF6 gas mixture
Title in Chinese:	六氟化硫混合绝缘气体混气比检测方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2019-06-04
Implemented on:	2019-10-01
Professional Classification:	DL-Electricity
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Introduction

Analysis of the core content of the standard

This standard specifies the detection method of sulfur hexafluoride mixed gas for the first time, with the key points including:

Method	Principle	Accuracy requirements	Applicable scenarios
Sensor method	Based on thermal conductivity/infrared absorption difference	SF6±1% \| O2±0.1%	On-site rapid detection
Gas chromatography	Chromatographic column separation + TCD detection	SF6±0.5% \| O2±0.05%	Precise laboratory analysis

Technology evolution analysis

Compared with the traditional single detection method, the innovation of this standard is reflected in:

For the first time, the parallel use specifications of mixed gas thermal conductivity sensor and infrared sensor are clarified
Chromatographic double-column separation technology (Porapak Q+13X molecular sieve) is introduced to solve the problem of component interference
Establish a standardized tail gas recovery process to meet environmental protection requirements

Implementation suggestions

Operation points

1. Sensor method Note:
• Annual calibration is required
• Operation sequence of oxygen sensor protection valve (close the protection valve first and then the instrument)
• Ambient humidity ≤85%

2. ChromatographyKey controls:
• Carrier gas purity ≥99.999%
• Quantitative loop flushing ≥3 minutes
• External standard method repeatability ≤±3%

Standard comparison

Indicator	DL/T1985-2019	IEC60480	ASTMD2685
Detection range	SF6 0-100%	SF6 10-100%	SF6 5-100%
O2 detection limit	0.1%	0.2%	0.15%
Temperature control requirements	±0.1℃	±0.5℃	±0.3℃

More samples: JC/T 2453-2018 GB 50021-2001(2009) JJG 21-2008

Sample only — not a preview of DL/T 1985-2019

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