Level 2
Level 2, Total:172 items.
The international standard classification for "Level 2" includes: Products in fibre-reinforced cement , Concrete and concrete products , Cables , Measurement of fluid flow in general , Magnetic components , Chemical analysis , Water supply systems , Waterproofing , Washers and other locking elements , Extraction and processing of petroleum and natural gas .
The Chinese standard classification for "Level 2" includes: Cement composite material and additives , Concrete product , Cable and its accessory , Basic standards and general method , Magnetic component , Basic standards and general methods for water treatment agent , Flow capacity and material level instrument , Roof and pavement waterproof and barrier material , Slotting, broaching, planing and sawing machines , Fasteners , Petroleum extraction , Length Measurement .
Professional Standard - Building Materials
- JC/T 412.2-2018 Fiber cement flat sheets. Part 2: Asbetos fiber cement flat sheets
- JC/T 412.2-2006 Fiber cement flat sheets Part 2: Asbestos Fiber cement flat sheets
- JC/T 412.1-2006 Fiber cement flat sheets Part 1: Non-Asbestos Fiber cement flat sheets
- JC/T 412.1-2018 Fiber cement flat sheets-Part 1:Non-asbetos fiber cement flat sheets
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
- GB/T 36536-2018 Test method of water balance in cement production enterprises
- GB/T 12666.2-2008 Test method on a single wire or cable under fire conditions - Part 2: Horizontal specimen flame test
- GB/T 42031-2022 Drawing method of water balance diagram for water-use organization
- GB/T 328.7-2007 Test methods for building sheets for waterproofing—Part 7:Plastic and rubber sheets for waterproofing-length width straightness and flatness
- GB/T 14643.2-2009 Examination of bacteria and algae in industrial circulating cooling water - Part 2: Examination of soil micro-bioti - Standard of plate count
- GB/T 28869.2-2023 Cores made of soft magnetic materials—Measuring methods—Part 2: Magnetic properties at low excitation level
- GB/T 778.2-2018 Meters for cold potable water and hot water—Part 2:Test methods
Group Standards of the People's Republic of China
- T/CFA 020102029-2023 Ductile iron pipes for trenchless construction— part 2 : used for horizontal directional drilling method
Taiwan Provincial Standard of the People's Republic of China
- CNS 13119-2000 Method of test for coefficient of static friction of paper and paperboard(Inclined plane method and horizontal plane method)
- CNS 11680-1986 Method of Test for Horizontal Load of Furniture
- CNS 5653-1980 Method of Test for Level Gauge
- CNS 474-1988 Method of Test for Flat Asbestos Cement Sheet
Professional Standard - Chemical Industry
- HG/T 21522-2005(编制说明) Horizontal hanging cover plate type flat welding flange manhole
- HG/T 21522-2005 Level of the hanging cover plate welded flange manhole
- HG 21523-1995 Horizontal hanging cover with neck flat welding flange manhole
- HG/T 21523-2014 Slip on flange manholes with davit to horizontal cover
- HG/T 21523-2005 The level hanging cover with neck flat welding flange manhole
- HG/T 21523-2005(编制说明) Horizontal hanging cover with neck flat welding flange manhole
- HG 21522-1995 Horizontal hanging cover plate type flat welding flange manhole
- HG/T 21522-2014 Plate flange manholes with davit to horizontal cover
Tianjin Provincial Standard of the People's Republic of China
- DB12/T 442-2011 Water Balance Test Method
Military Standard of the People's Republic of China-Commission of Science,Technology and Industry for National Defence
- GJB 6477-2008 Test method of large caliber DAVIS gun experiment. Horizontal launch
Professional Standard - Machinery
- JB/T 5758.2-2008 Traverse head shaping machines—Part 2:Specifications
- JB/T 585-1979 Horizontal ceiling butt welding flange entry hole
农业农村部
- NY/T 3489-2019 The evaluation for the level of agricultural mechanization—Part 2:tockbreeding
未注明发布机构
- DIN EN ISO 21528-2 E:2014-08 Horizontal methods for detection and enumeration of Enterobacteriaceae in food chain microbiology Part 2: Colony counting method (draft)
- DIN EN ISO 19085-2 E:2014-11 Woodworking Machinery Safety Part 2: Horizontal Beam and Plate Circular Saws (Draft)
Professional Standard - Aerospace
- QJ 3147.2-2002 Flat Washers - Part2: Plain Flat Washers
Zhejiang Provincial Standard of the People's Republic of China
- DB3304/T 046.2-2020 Technical Specifications for Rice and Fishery Comprehensive Planting and Breeding in Plain Water Country Part 2: Rice Soft-shelled Turtle
Professional Standard - Petroleum
- SY 6846-2012 Completion Method of Upper Cementing and Lower Screen Tube in Horizontal Wells
- SY/T 6846-2012 Horizontal well completion technology with stage cementing
National Metrological Verification Regulations of the People's Republic of China
- JJG 103-2005 Verification Regulation of Electronic Levels and Coincidence Levels
IX-ECMA
- ECMA TR 27-1995 Method for the prediction of installation noise levels (Second Edition)
Korean Agency for Technology and Standards (KATS)
- KS C IEC 61580-2-2020 Methods of measurement for waveguides-Part 2:Level of intermodulation products
- KS C IEC 62044-2-2023 Cores made of soft magnetic materials — Measuring methods — Part 2: Magnetic properties at low excitation level
- KS K 0478-1980 Test method for snarl index of cotton yarn:Horizontal method
- KS K 0478-2010 Test method for snarl index of cotton yarn:Horizontal method
- KS C IEC 62044-2:2018 Cores made of soft magnetic materials — Measuring methods — Part 2: Magnetic properties at low excitation level
- KS A 0603-2005 METHODS OF MEASUREMENT FOR VIBRATION LEVEL
- KS C IEC 61580-2:2005 Methods of measurement for waveguides-Part 2:Level of intermodulation products
- KS K 0583-2011 Test method for flame resistance of cloth:Horizontal method
- KS K 0583-2016 Test method for flame resistance of cloth:Horizontal method
- KS K 0583-2022 Test method for flame resistance of cloth: Horizontal method
- KS K 0583-2016(2021) Test method for flame resistance of cloth:Horizontal method
- KS K 0583-1985 Test method for flame resistance of cloth: Horizontal method
- KS M 2954-2007(2022) Test methods of water-soluble flux for horizontal soldering
- KS A 0603-1988(2003) METHODS OF MEASUREMENT FOR VIBRATION LEVEL
- KS L 0006-2022 Heat balance method of cement rotary kiln
- KS B 5547-1993 Levels
- KS B 5547-1993(2018) Levels
- KS K 0582-1980 Test method for burning rate of cloth: Horizontal method
- KS K 0582-2011 Test method for burning rate of cloth:Horizontal method
- KS K 0582-2021 Test method for burning rate of cloth: Horizontal method
ES-UNE
- UNE-EN 61580-2:1996 METHODS OF MEASUREMENT FOR WAVEGUIDES. PART 2: LEVEL OF INTERMOFULATION PRODUCTS. (Endorsed by AENOR in December of 1996.)
- UNE-EN 62044-2:2005/AC:2021-06 Cores made of soft magnetic materials - Measuring methods - Part 2: Magnetic properties at low excitation level (Endorsed by Asociación Española de Normalización in July of 2021.)
- UNE-ISO 7619-1:2011 ERRATUM:2011 Road signalisation equipment. Horizontal signalisation. Application machines. Part 2: Test methods.
- UNE-EN 62044-2:2005 Cores made of soft magnetic materials - Measuring methods -- Part 2: Magnetic properties at low excitation level (Endorsed by AENOR in September of 2005.)
- UNE-EN ISO 19085-2:2022 Woodworking machines - Safety - Part 2: Horizontal beam panel circular sawing machines (ISO 19085-2:2021)
- UNE-EN ISO 4064-2:2018/A11:2023 Water meters for cold potable water and hot water - Part 2: Test methods (ISO 4064-2:2014)
Association Francaise de Normalisation
- NF EN 61580-2:2002 Measurement methods applied to waveguides - Part 2: level of intermodulation products
- NF EN 62044-2:2005 Cores of soft magnetic materials - Measurement methods - Part 2: magnetic properties at low excitation level
- NF E64-600-2:2018 Woodworking machines - Safety - Part 2 : horizontal beam panel circular sawing machines
- NF E64-600-2*NF EN ISO 19085-2:2021 Woodworking machines - Safety - Part 2 : horizontal beam panel circular sawing machines
- XP C93-923-2-2:2021 Enclosures for optical connection points - Part 2-2: outdoor use - In rooms or at ground level
- NF ISO 17208-2:2020 Underwater acoustics - Quantities and methods of description and measurement of underwater acoustics of ships - Part 2: determination of source levels from deep sea measurements
- NF EN ISO 19085-2:2021 Machines à bois - Sécurité - Partie 2 : scies circulaires à panneaux horizontales à presseur
- NF EN 3844-2:2019 Aerospace series - Flammability of non-metallic materials - Part 2: burner test, horizontal - Determination of horizontal flame propagation
- NF E17-002-2*NF EN ISO 4064-2:2017 Water meters for cold potable water and hot water - Part 2: test methods
NATO - North Atlantic Treaty Organization
- STANAG 6001-2003 Language Proficiency Levels (ED 2)
International Organization for Standardization (ISO)
- ISO/TS 19046-2:2017 Cheese — Determination of propionic acid level by chromatography — Part 2: Method by ion exchange chromatography
- ISO 396-2:1980 Products in fibre reinforced cement; Part 2 : Silica-asbestos-cement flat sheets
- ISO 9125:1990/Cor 2:2005 Fibre-cement slates and fittings; Technical Corrigendum 2
- ISO 19085-2:2021 Woodworking machines — Safety — Part 2: Horizontal beam panel circular sawing machines
- ISO 19085-2:2017 Woodworking machines - Safety - Part 2: Horizontal beam panel circular sawing machines
- ISO 21528-2:2017 Microbiology of the food chain - Horizontal method for the detection and enumeration of Enterobacteriaceae - Part 2: Colony-count technique
- ISO 14694:2003/CD Amd 2 Industrial fans-Specifications for balance quality and vibration levels-Amendment 2
- ISO/IEC 19086-2:2018 Cloud computing — Service level agreement (SLA) framework — Part 2: Metric model
- ISO/DIS 4064-2:2023 Water meters for cold potable water and hot water — Part 2: Test methods
AENOR
- UNE 135277-2:2011 Road signalisation equipment. Horizontal signalisation. Application machines. Part 2: Test methods.
- UNE-EN ISO 4064-2:2015 Water meters for cold potable water and hot water - Part 2: Test methods (ISO 4064-2:2014)
U.S. Air Force
- AIR FORCE MIL-I-26689C-1981 INDICATOR, HORIZONTAL SITUATION, AQU-2/A
- AIR FORCE MIL-I-26689 C NOTICE 1-1996 INDICATOR, HORIZONTAL SITUATION, AQU-2/A
- AIR FORCE MIL-I-26689 C (2)-1994 INDICATOR, HORIZONTAL SITUATION, AQU-2/A
- AIR FORCE MIL-I-26689 C-1981 INDICATOR, HORIZONTAL SITUATION, AQU-2/A
SCC
- 06/30145217 DC EN 671-2. Fixed firefighting systems. Hose systems. Part 2. Hose system with lay-flat hose
- DANSK DS/EN 62044-2/AC:2005 Cores made of soft magnetic materials - Measuring methods - Part 2: Magnetic properties at low excitation level
- CEI EN 62044-2/AC:2005 Cores made of soft magnetic materials - Measuring methods Part 2: Magnetic properties at low excitation level
- MIL MIL-DTL-3922/57D-2013 Flanges, Waveguide (Cover) (Round, 8 Hole) (2 Holes Centered Horizontally, 2 Holes Centers Vertically)
- MIL MIL-DTL-3922/57C-2008 Flanges, Waveguide (Cover) (Round, 8 Hole) (2 Holes Centered Horizontally, 2 Holes Centers Vertically)
- DANSK DS/EN ISO 4833-2:2013 Microbiology of the food chain - Horizontal method for the enumeration of microorganisms - Part 2: Colony count at 30 degrees C by the surface plating technique
- DANSK DS/EN ISO 19085-2:2017 Woodworking machines – Safety – Part 2: Horizontal beam panel circular sawing machines (ISO 19085-2:2017)
- IEC 61156-2-1:1995/AMD2:2001 Amendment 2 - Part 2:Horizontal floor wiring. Section 1:Blank detail specification
- NS-EN ISO 19085-2:2021 Woodworking machines – Safety – Part 2: Horizontal beam panel circular sawing machines (ISO 19085-2:2021)
- DANSK DS/ISO 19085-2:2021 Woodworking machines – Safety – Part 2: Horizontal beam panel circular sawing machines
- MIL MIL-DTL-3922/62E-2019 Flanges, Waveguide (Choke) (Round, 8 Hole (2 Holes Centered Horizontally, 2 Holes Centered Vertically))
- MIL MIL-DTL-3922/62D-2010 Flanges, Waveguide (Choke) (Round, 8 Hole (2 Holes Centered Horizontally, 2 Holes Centered Vertically))
- CEI EN 62044-2:2005 Cores made of soft magnetic materials - Measuring methods Part 2: Magnetic properties at low excitation level
- DANSK DS/EN 62044-2:2005 Cores made of soft magnetic materials - Measuring methods - Part 2: Magnetic properties at low excitation level
- NS-EN ISO 4064-2:2014 Water meters for cold potable water and hot water — Part 2: Test methods (ISO 4064-2:2014)
- NS-EN ISO 4064-2:2017 Water meters for cold potable water and hot water - Part 2: Test methods (ISO 4064-2:2014)
- AENOR UNE 135200-2:2002 Street sign equipment. Horizontal signage. Part 2: Materials. Laboratory tests.
- 06/30151270 DC BS ISO 21527-2. Horizontal method for the enumeration of yeasts and moulds. Colony-count technique. Part 2. Products with a water activity less than or equal to 0,95
- DIN EN ISO 21528-2 E:2014 Draft Document - Microbiology of the food chain - Horizontal methods for the detection and enumeration of Enterobacteriaceae - Part 2: Colony-count method (ISO/DIS 21528-2:2014); German version prEN ISO 21528-2:2014
- DANSK DS/EN ISO 4064-2:2017 Water meters for cold potable water and hot water – Part 2: Test methods (ISO 4064-2:2014)
- 07/30164098 DC BS ISO 29582-2. Methods of testing cement. Determination of the heat of hydration. Part 2. Semi-adiabatic method
- NS-EN ISO 4833-2:2013 Microbiology of the food chain - Horizontal method for the enumeration of microorganisms - Part 2: Colony count at 30 degrees C by the surface plating technique (ISO 4833-2:2013)
- CEI UNI EN/ISO 4064-2:2015 Water meters for cold potable water and hot water Part 2: Test methods
Japanese Industrial Standards Committee (JISC)
- JIS B 7610-2:2000 Pressure balances -- Part 2: Test methods
- JIS K 2265-2:2007 Determination of flash point -- Part 2: Rapid equilibrium closed cup method
Indonesia Standards
- SNI 06-6989.11-2004 Water and wastewater - Part 11: Test methods of acidity levels (pH) by pH meters
- SNI 19-6988-2004 Vertical control nets by levelling methods
German Institute for Standardization
- DIN EN 62044-2:2006-01 Cores made of soft magnetic materials - Measuring methods - Part 2: Magnetic properties at low excitation level (IEC 62044-2:2005); German version EN 62044-2:2005
- DIN EN 14153-2:2004 Recreational diving services - Safety related minimum requirements for the training of recreational scuba divers - Part 2: Level 2 - Autonomous diver; German version EN 14153-2:2003
- DIN EN ISO 19085-2:2018 Woodworking machines - Safety - Part 2: Horizontal beam panel circular sawing machines (ISO 19085-2:2017)
- DIN EN ISO 19085-2:2022-05 Woodworking machines - Safety - Part 2: Horizontal beam panel circular sawing machines (ISO 19085-2:2021); German version EN ISO 19085-2:2021
- DIN EN 62044-2:2006 Cores made of soft magnetic materials - Measuring methods - Part 2: Magnetic properties at low excitation level (IEC 62044-2:2005); German version EN 62044-2:2005
- DIN EN 62044-2 Berichtigung 1:2021-09 Cores made of soft magnetic materials - Measuring methods - Part 2: Magnetic properties at low excitation level (IEC 62044-2:2005/COR1:2021); German version EN 62044-2:2005/AC:2021-06
- DIN EN 1848-2:2001 Flexible sheets for waterproofing - Determination of length, width, straightness and flatness - Part 2: Plastic and rubber sheets for roof waterproofing; German version EN 1848-2:2001
- DIN EN ISO 19085-2:2020 Woodworking machines - Safety - Part 2: Horizontal beam panel circular sawing machines (ISO/DIS 19085-2:2020); German and English version prEN ISO 19085-2:2020
- DIN EN ISO 4064-2:2017 Water meters for cold potable water and hot water - Part 2: Test methods (ISO 4064-2:2014)
- DIN EN ISO 4064-2/A11:2023 Water meters for cold potable water and hot water - Part 2: Test methods (ISO 4064-2:2014)
- DIN ISO 21528-2:2009 Microbiology of food and animal feeding stuffs - Horizontal methods for the detection and enumeration of Enterobacteriaceae - Part 2: Colony-count method (ISO 21528-2:2004)
- DIN EN ISO 21528-2:2017 Microbiology of the food chain - Horizontal method for the detection and enumeration of Enterobacteriaceae - Part 2: Colony-count technique (ISO 21528-2:2017); German version EN ISO 21528-2:2017
- DIN EN ISO 4064-2/A11:2023-02 Water meters for cold potable water and hot water - Part 2: Test methods (ISO 4064-2:2014); German version EN ISO 4064-2:2017/A11:2022
- DIN EN ISO 4064-2:2023 Water meters for cold potable water and hot water - Part 2: Test methods (ISO/DIS 4064-2:2023); German and English version prEN ISO 4064-2:2023
GSO
- OS GSO IEC 62044-2:2014 Cores made of soft magnetic materials - Measuring methods - Part 2: Magnetic properties at low excitation level
- GSO IEC 62044-2:2014 Cores made of soft magnetic materials - Measuring methods - Part 2: Magnetic properties at low excitation level
- OS GSO ISO 4833-2:2016 Microbiology of the food chain -- Horizontal method for the enumeration of microorganisms -- Part 2: Colony count at 30 degrees C by the surface plating technique
- GSO ISO 4833-2:2016 Microbiology of the food chain -- Horizontal method for the enumeration of microorganisms -- Part 2: Colony count at 30 degrees C by the surface plating technique
- BH GSO ISO 4833-2:2017 Microbiology of the food chain -- Horizontal method for the enumeration of microorganisms -- Part 2: Colony count at 30 degrees C by the surface plating technique
- GSO ISO 16122-2:2015 Agricultural and forestry machinery -- Inspection of sprayers in use -- Part 2: Horizontal boom sprayers
- OS GSO ISO 4064-2:2017 WATER METERS FOR COLD POTABLE WATER AND HOT WATER -- PART 2: TEST METHODS
British Standards Institution (BSI)
- BS EN 62044-2:2005(2021) Cores made of soft magnetic materials — Measuring methods Part 2 : Magnetic properties at low excitation level
- 23/30452565 DC BS EN ISO 4064-2. Water meters for cold potable water and hot water - Part 2. Test methods
Defense Logistics Agency
- DLA MIL-DTL-3922/62 D-2010 FLANGES, WAVEGUIDE (CHOKE) (ROUND, 8 HOLE (2 HOLES CENTERED HORIZONTALLY, 2 HOLES CENTERED VERTICALLY))
- DLA MIL-DTL-3922/57 C-2008 FLANGES, WAVEGUIDE (COVER) (ROUND, 8 HOLE) (2 HOLES CENTERED HORIZONTALLY, 2 HOLES CENTERS VERTICALLY)
- DLA MIL-DTL-3922/57 D-2013 FLANGES, WAVEGUIDE (COVER) (ROUND, 8 HOLE) (2 HOLES CENTERED HORIZONTALLY, 2 HOLES CENTERS VERTICALLY)
European Committee for Standardization (CEN)
- EN ISO 19085-2:2017 Woodworking machines - Safety - Part 2: Horizontal beam panel circular sawing machines
- EN ISO 19085-2:2021 Woodworking machines - Safety - Part 2: Horizontal beam panel circular sawing machines (ISO 19085-2:2021)
- FprEN ISO 19085-2:2021 Woodworking machines - Safety - Part 2: Horizontal beam panel circular sawing machines (ISO/FDIS 19085-2:2021)
- EN ISO 21528-2:2017 Microbiology of the food chain - Horizontal method for the detection and enumeration of Enterobacteriaceae - Part 2: Colony-count technique
- prEN ISO 4064-2 rev Water meters for cold potable water and hot water - Part 2: Test methods (ISO 4064-2:2014)
- prEN ISO 4064-2 Water meters for cold potable water and hot water - Part 2: Test methods (ISO/DIS 4064-2:2023)
- EN 14153-2:2003 Recreational diving services Safety related minimum requirements for the training of recreational scuba divers Part 2: Level 2 Autonomous Diver
KR-KS
- KS C IEC 62044-2-2018(2023) Cores made of soft magnetic materials — Measuring methods — Part 2: Magnetic properties at low excitation level
- KS F ISO 9239-2-2008 Method for fire tests of floorings-Part 2:Determination of the flame spread at a heat flux level of 25 kW/m2
- KS C IEC 62044-2-2018 Cores made of soft magnetic materials — Measuring methods — Part 2: Magnetic properties at low excitation level
- KS C 1508-1998(2023) Level recorders for recording sound level and/or vibration level
DIN
- DIN EN ISO 19085-2:2022 Woodworking machines - Safety - Part 2: Horizontal beam panel circular sawing machines (ISO 19085-2:2021)
- DIN EN ISO 4833-2:2022 Microbiology of the food chain - Horizontal method for the enumeration of microorganisms - Part 2: Colony count at 30 °C by the surface plating technique (ISO 4833-2:2013 + Cor. 1:2014 + Amd 1:2022)
International Electrotechnical Commission (IEC)
- IEC 61580-2:1996 Methods of measurement for waveguides - Part 2: Level of intermodulation products
European Committee for Electrotechnical Standardization(CENELEC)
- EN 61580-2:1996 Methods of Measurement for Waveguides Part 2: Level of Intermodulation Products
- prEN IEC 60071-2:2022 Insulation co-ordination - Part 2: Application guidelines (Proposed horizontal standard)
Lithuanian Standards Office
- LST EN 62044-2-2005 Cores made of soft magnetic materials. Measuring methods. Part 2: Magnetic properties at low excitation level (IEC 62044-2:2005)
- LST EN 62044-2/AC-2021 Cores made of soft magnetic materials - Measuring methods - Part 2: Magnetic properties at low excitation level (IEC 62044-2:2005/COR1:2021)
American Society for Testing and Materials (ASTM)
- ASTM E1364-95(2005) Standard Test Method for Measuring Road Roughness by Static Level Method
- ASTM D4785-93 Standard Test Method for Low-Level Iodine-131 in Water
- ASTM D5543-09 Standard Test Methods for Low-Level Dissolved Oxygen in Water
- ASTM D5543-15 Standard Test Method for Low-Level Dissolved Oxygen in Water
- ASTM D5543-94(2005) Standard Test Methods for Low-Level Dissolved Oxygen in Water
- ASTM D5543-94(1999)e1 Standard Test Methods for Low-Level Dissolved Oxygen in Water
ASD-STAN - Aerospace and Defence Industries Association of Europe - Standardization
- PREN 3844-2-2018 Aerospace series Flammability of non-metallic materials Part 2: Small burner test@ horizontal Determination of the horizontal flame propagation (Edition P 2)
Danish Standards Foundation
- DS/EN 62044-2:2005 Cores made of soft magnetic materials - Measuring methods - Part 2: Magnetic properties at low excitation level
PL-PKN
- PN-EN 62044-2-2009/AC-2021-08 E Cores made of soft magnetic materials - Measuring methods - Part 2: Magnetic properties at low excitation level
TR-TSE
- TS 2396-1976 LEVELLING POINT MONUMENTS AND CONSTRUCT?ON MEDHODS
ZA-SANS
- NRS 048-2-2007 Electricity supply - Quality of supply Part 2: Voltage characteristics, compatibility levels, limits and assessment methods
- NRS 048-2-2007 Ed 3 Electricity supply - Quality of supply Part 2: Voltage characteristics, compatibility levels, limits and assessment methods
VN-TCVN
- TCVN 4884-2-2015 Microbiology of the food chain - Horizontal method for the enumeration of microorganisms .Part 2: Colony count at 30 degrees C by the surface plating technique
Level 2,Determination of wear metal content in aviation working fluids Part 2: Inductively coupled plasma atomic emission spectrometer detection method