This standard specifies the technical requirements, test methods, inspection rules, and marking, packaging, transportation and storage requirements of optical interferometer methane detectors. This standard applies to optical interferometer methane detectors (hereinafter referred to as instruments) for measuring methane concentration (V/V) in the air in coal mines and other workplaces. MT 28-2005 Optical Interferometer Methane Determination MT28-2005 Standard download decompression password: www.bzxz.net

ICS 17. 180. 30
Request number: 15518—2005
Coal Industry Standard of the People's Republic of China
MT28—2005
Replaces MT28—1994
Methane Detector of Interferometer Type 2005-02-14 Issued by
National Development and Reform Commission
2005-06-01 Implementation
Normative references
Model naming and compilation method
Technical requirements
Test methods
Inspection regulations
Marking, packaging, transportation and storage
Appendix A (Normative Appendix) Correction of water column height at different temperatures.
MT28—2005
MT28--2005
This standard is a mandatory standard.
This standard replaces MT28—1994 "Optical Interference Methane Determination Device". Compared with MT28-1994, the main changes of this standard are as follows: a) The format has been changed accordingly according to GB/T1.12000; b) The model naming and compilation method of the instrument have been added, and the measurement range of the instrument has been specified (4 of this standard); the requirements for the working conditions, storage conditions and test conditions of the instrument have been added (5.2~~~5.4 of this standard); d)
The basic error assessment after the instrument free fall test, impact test and vibration test has been added (5.6.5, 5.6.8.5.6.9 of this standard);
The time of the diffusion test has been changed from 3h to 8h (Article 6.7 of this standard); f)
The air pressure method has been added, and the mercury column pressure method has been cancelled (6.4.1 of this standard); g) The instrument storage temperature test has been added (6.10). Appendix A of this standard is a normative appendix.
This standard is proposed by the Science and Technology Development Department of the China Coal Industry Association. This standard is under the jurisdiction of the Coal Mine Safety Standardization Technical Committee of the Coal Industry. This standard was drafted by Fushun Branch of China Coal Research Institute. The main drafters of this standard are Qin Yan, Dong Chunhai, Chen Haoman and Zhang Wanze. 1 Scope
Optical Interference Methane Determination Instrument
MT28—2005
This standard specifies the technical requirements, test methods, inspection rules, and marking, packaging, transportation and storage requirements of optical interference methane determination instruments.
This standard applies to optical interference methane determination instruments (hereinafter referred to as instruments) for measuring methane concentration (V/V) in the air in coal mines and other workplaces.
2 Normative References
The clauses in the following documents become clauses of this standard through the use of this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this standard. GB191 Packaging, storage and transportation graphic signs
GB/T2423.1 Environmental testing for electric and electronic products Part 2: Test methods Test A: Low temperature GB/T2423.2 Environmental testing for electric and electronic products Part 2: Test methods Test B: High temperature GB/T2423.4 Basic environmental testing procedures for electric and electronic products Test Db: Alternating heat test method GB/T2423.5 Environmental testing for electric and electronic products Part 2: Test methods Test Ea and guidance: Impact GB/T2423.8 Environmental testing for electric and electronic products Part 2: Test methods Test Ed: Free fall GB/T2423.10 Environmental testing for electric and electronic products Part 2 Division: Test method Test Fc and Guide: Vibration (sinusoidal) GB3836.4---2000 Electrical equipment for explosive gas atmospheres Part 4: Intrinsically safe type \i\ GB/T6388 Transport packaging delivery and receipt markings
GB/T10111 Method for random sampling using random numbers MT/T154.10--1996 Method for compiling product models and management methods for safety instruments for coal mines MT209-1990 General technical requirements for electrical and electronic products for coal mine communication, detection and control MT424-1995 General technical conditions for optical interference methane determination and calibration instrument 3 Definitions
This standard adopts the following definitions.
Basic error basic error
The difference between the indicated value and the standard value of the instrument under the specified normal working conditions. 3.2
Pressure way
The method of applying pressure to the gas sample chamber to generate a pressure difference between the gas sample chamber and the air chamber, thereby generating a refractive index difference to replace the refractive index difference caused by the different types of gases in the two chambers. 4 Model naming and compilation method
4.1 Model naming and compilation method are stipulated as follows: 1
MT 28—2005
4.2 The main parameters are expressed in the measuring range of the instrument: a) 0～10%CH;Www.bzxZ.net
b) 0～100%CH4.
5 Technical requirements
Design modification number: (A), (B), (C)
Main parameters: Measuring range
Second characteristic code: Optical interference principle
First characteristic code: Methane
Product type code: Determination instrument
5.1 The instrument shall comply with the provisions of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 5.2 The normal working conditions of the instrument are:
Temperature: -10～40℃.
5.3 The storage environment temperature of the instrument is: -20～55℃. 5.4 The test conditions of the instrument are:
Temperature: 15~～35℃;
Relative humidity: 45%~～75%;
Air pressure: 86～106kPa
The surrounding environment should be natural air.
5.5 General requirements:
5.5.1 The paint and electroplating layers should be uniform, firm and of uniform color. 5.5.2 Optical parts should not have obvious mildew, bubbles, sand holes, pitting, scratches, fingerprints and dust, etc. Optical parts should not be debonded after gluing; coated optical parts should not be debonded.
5.5.3 The connection of instrument parts should be firm, reliable and of appropriate tightness. The rotation of each rotating part of the instrument should be smooth and flexible. 5.5.4
There should be enough field of view to observe the interference fringes, and the interference fringes should be clear without obvious bending and tilting. 5.5.5
5.5.6 The reference interference fringes should not be stepped within the entire scale range. 5.5.7 When adjusting the interference fringes, there should be no sudden jump phenomenon, and there should be no obvious secondary image in the field of view. 5.5.8 When adjusting the telescope eyepiece, the reticle image should not shake significantly. 5.6 Performance requirements:
5.6.1 The basic error of the instrument for different indication ranges shall meet the requirements of Table 1 when the upper limit of measurement is 10%CH; and meet the requirements of Table 2 when the upper limit of measurement is 100%CH.
Measurement range
Basic error
0～10
7≤10
Measurement range
Basic error
10
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