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JJG 678-2007 English PDF

US$389.00 · In stock
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JJG 678-2007: Verification Regulation of Catalysis Combustion Type Methane Measuring Device
Status: Valid

JJG 678: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
JJG 678-2007	English	389	Add to Cart	3 days [Need to translate]	Verification Regulation of Catalysis Combustion Type Methane Measuring Device	Valid	JJG 678-2007
JJG 678-1996	English	319	Add to Cart	3 days [Need to translate]	Verification Regulation of Catelysis Combustion Type Methane Measuring Device	Obsolete	JJG 678-1996
JJG 678-1990	English	439	Add to Cart	4 days [Need to translate]	Verification Regulation of Catalysis Combustion Type Methane Measuring Device	Obsolete	JJG 678-1990

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Basic data

Standard ID	JJG 678-2007 (JJG678-2007)
Description (Translated English)	Verification Regulation of Catalysis Combustion Type Methane Measuring Device
Sector / Industry	Metrology & Measurement Industry Standard
Classification of Chinese Standard	A61
Classification of International Standard	17.120
Word Count Estimation	15,115
Date of Issue	2007-08-21
Date of Implementation	2008-02-21
Older Standard (superseded by this standard)	JJG 678-1996
Quoted Standard	AQSIQ Announcement No. 142 of 2007
Regulation (derived from)	AQSIQ Announcement No. 142 of 2007
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine
Summary	This standard applies to mines with a loss of catalytic combustion of methane detector initial verification, testing and use of follow-up inspection.

JJG 678-2007: Verification Regulation of Catalysis Combustion Type Methane Measuring Device

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Verification Regulation of Catalysis Combustion Type Methane Measuring Device State verification procedures People's Republic of China Catalytic combustion of methane detector Posted 2007-08-21 2008-02-21 implementation The State Administration of Quality Supervision, Inspection and Quarantine released Catalytic combustion of methane detector Verification Regulation Device Replacing JJG 678-1996 The regulations by the State Administration of Quality Supervision, Inspection and Quarantine approved on August 21, 2007, and from From February 21, 2008 implementation. Focal point. the National Technical Committee on Environment stoichiometry The main drafting units. China Institute of Metrology Chongqing cheap energy Ltd. National Mine Safety metering station Participated in the drafting unit. Jinan City, the metrological verification National Mine Safety metering station sub-station in Urumqi Chongqing Ke Electronic Co., Ltd. This procedure commissioned the National Technical Committee of the stoichiometric environment responsible for interpreting The main drafters of this procedure. Chen Yonghua (China Institute of Metrology) Zhou Zongfu (Chongqing inexpensive energy Ltd.) Chen Fumin (National Mine Safety metering station) Drafters participate. Wang Limin (Jinan City, the metrological verification) Cao Zhigang (China Institute of Metrology) Dongzi Bing (National Mine Safety Urumqi metering station sub-station) Du Jianguo (Chongqing Ke Electronic Co., Ltd.)

1 Scope (1) 2 Overview (1) 3 metering performance requirements (1) 3.1 indication error (1) 3.2 Alarm error (1) 3.3 Response Time (1) 3.4 Drift (1) 3.5 alarm sound level and signal strength (1) 3.6 load characteristics (1) 4 General Requirements (2) 4.1 Appearance (2) 4.2 Identification and Accessories (2) 4.3 energizing check (2) 5 control of measuring instruments (2) 5.1 verification Conditions (2) 5.2 Verification Project (3) 5.3 Verification Methods (3) 5.4 Verification Results Processing (5) 5.5 test cycle (5) Appendix A test certificate-page format (6) Appendix B test results in the notice page format (7) Appendix C portable instrument calibration original record format (8) Appendix D stationary instrument calibration original record format (9) Catalytic combustion of methane detector test procedures

1 Scope

The order applies to mines with catalytic combustion of methane detector (hereinafter referred to as equipment) initial verification, subsequent verification And in-service inspection.

2 Overview

Instrument carrier thermal catalytic combustion principle, by a carrier catalytic element constituting the measuring bridge, when the instrument environment The presence of methane gas due to methane in the catalytic element surface flameless combustion, catalytic carrier resistance detection element Value changes, the bridge imbalance signal to produce an output signal magnitude and linearly proportional to the methane content in order to achieve Methane content detection and alarm. Catalytic combustion of methane detector has two types of portable and fixed, stationary methane detector, also known as methane Biography Sensors. For measuring methane content in mine and alarm, when the methane concentration reaches the alarm set point, the instrument emits sound, Light alarm signal.

3 metering performance requirements

3.1 Indication error Indication error expressed in absolute error. Instrument under specified operating conditions, the differential value of the maximum value and the standard should not be Than specified in Table 1. Table 1 shows the error Measurement range /% CH4 0 ~ 4 Break /% CH4 0≤X≤1 1 \u003cX≤2 2\u003cX≤4 The maximum permissible error /% CH4 ± 0.10 ± 0.20 ± 0.30 3.2 Alarm error Instrument alarm differential value and alarm set value should not exceed ± 0.10% CH4. 3.3 Response Time Diffusion sampling instrument shall not exceed 20s, inhaled sampling instruments should not exceed 10s. 3.4 Drift Instrument drift includes zero drift and span drift. Zero drift should not exceed ± 0.10% CH4, span drift Shall not exceed ± 0.20% CH4. 3.5 alarm sound level and signal strength The portable instrument alarm sound level intensity should not be less than 75dB (A), fixed instrument alarm sound level intensity should not be less than 80dB (A). Alarm signal light in a dark environment at 20m should be clearly visible. 3.6 load characteristics

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