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GB/T 25930-2010: Test method of infrared gas analyzers Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 25930-2010: Test method of infrared gas analyzers---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT25930-2010GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 71.040.01 N 53 Test method of infrared gas analyzers ISSUED ON: JANUARY 14, 2011 IMPLEMENTED ON: MAY 01, 2011 Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People’s Republic of China. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Test conditions ... 5 4 Test methods ... 6 Test method of infrared gas analyzers1 ScopeThis Standard specifies the test conditions, test items and test methods of infrared gas analyzers. This Standard applies to the non-dispersive infrared gas analyzer (hereinafter referred to as the instrument) for the continuous determination of one component or several components in the mixed gas.2 Normative referencesThe terms in the following documents become the terms of this Standard by reference to this Standard. For dated references, all subsequent amendments (not including errata content) or revisions do not apply to this standard. However, parties to agreements that are based on this Standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest edition applies to this Standard. GB 4793.1-2007, Safety requirements for electrical equipment for measurement, control, and laboratory use - Part 1:General requirements (IEC 61010-1:2001, IDT) GB/T 11606-2007, Methods of environmental test for analytical instruments GB/T 17626.2-2006, Electromagnetic compatibility (EMC) - Testing and measurement techniques - Electrostatic discharge immunity test (IEC 61000-4-2: 2001, IDT) GB/T 17626.3-2006, Electromagnetic compatibility - Testing and measurement techniques - Radiated radio-frequency electromagnetic field immunity test (IEC 61000-4-3: 2002, IDT) GB/T 17626.4-2008, Electromagnetic compatibility - Testing and measurement techniques - Electrical fast transient/burst immunity test (IEC 61000-4-4: 2004, IDT) GB/T 17626.5-2008, Electromagnetic compatibility - Testing and measurement techniques - Surge immunity test (IEC 61000-4-5: 2005, IDT) 3.2 The calibration gas for test shall be the national standard gas of Grade-II or above. 3.3 The accuracy of the measurement machine and recording equipment for test shall be better than that of the tested instrument. 3.4 During the test, external methods are not allowed to adjust the instrument, unless it can be proved that this adjustment does not affect the test results. If there is an automatic adjustment function, it shall be stated. 3.5 Multi-range or multi-component instruments shall be tested separately for all ranges. 3.6 The operation of the instrument shall comply with relevant safety regulations.4 Test methods4.1 Appearance and completeness inspection of the instrument Use methods such as visual inspection and hand feeling. 4.2 Safety test 4.2.1 Marking and documents Inspect visually. 4.2.2 Anti-shock test 4.2.2.1 Pick-up current 4.2.2.1.1 Test exemption conditions Under normal operating conditions, when the voltage, between the accessible parts and the reference ground, or between any two accessible parts within a distance of 1.8 m (along the surface or through the air) on the same platform, does not exceed 33 V (AC effective value) or DC 70 V, this test is not required. 4.2.2.1.2 Test method Carry out the test according to the relevant regulations of GB 4793.1-2007. 4.2.2.2 Protective grounding Carry out the test according to the relevant regulations in Appendix F of GB 4793.1-2007. 4.2.2.3 Dielectric strength 4.2.3 Other safety tests Perform according to the method corresponding to GB 4793.1-2007. 4.3 Preheating time Turn on the power of the instrument; continuously inlet the calibration gas of the specified concentration to the instrument; use a recording device whose accuracy is equal to or better than 0.5 to record the output signal of the instrument. It is the preheating time FROM when the instrument is turned on TO the error of the output signal appears within 30 minutes of the recording line is not more than one-half of the specified range drift. Calculate the relative error δw according to Formula (1): Where: Amax, Amin – respectively the maximum and minimum values recorded; R – full range value (same as below). Note 1: Unless otherwise specified, the inject gas is carried out according to the specified flow rate, same as below. Note 2: The calibration gas of the specified concentration refers to the calibration gas whose concentration is 70% ~ 95% of the full scale, same as below. 4.4 Air tightness 4.4.1 Use air or nitrogen to test the air tightness of the instrument; the volume of the external pipeline is required to be no more than 0.5 L. 4.4.2 When using positive pressure for the test, the gas outlet end is connected to a 0.5-grade gas pressure gauge (the resolution of the pressure gauge is better than 2.5% of the test pressure), and the gas inlet end is introduced with gas to make the pressure reach 1.5 times the rated working pressure of the instrument; seal the inlet, and start timing after 5 minutes; record the pressure drop within 15 minutes; calculate according to Formula (2). 4.9 Retardation time (T10), rise time (Tr) and fall time (Tf), response time (T90) 4.9.1 The output signal value of the instrument is recorded with a recording device; the pressure and flow rate of the calibration gas are constant. 4.9.2 Inlet the zero-calibration gas and the calibration gas of the specified concentration into the instrument respectively; record the displayed values A1 and A2 after stabilization. Calculate the values of AT10 = A1 + 0.1 × (A2 - A1) and AT90 = A1 + 0.9 × (A2 - A1) respectively. 4.9.3 Re-inlet the zero-calibration gas; after the displayed value stabilizes, inlet the calibration gas of the specified concentration. After the calibration gas is introduced from the gas inlet of the instrument, use a stopwatch to record the time from the instrument indication to AT10 and the time from AT10 to AT90, respectively. These two times are respectively the retardation time (T10) and the rise time (Tr). Then, inlet the calibration gas of the specified concentration. After the displayed value is stable, inlet the zero-calibration gas to the instrument. Use a stopwatch to record the elapsed time for the displayed value from AT90 to AT10, which is the fall time (Tf). The response time (T90) is the sum of the retardation time and the rise time (or the fall time). 4.9.4 If there is any dispute over the above measurement results, the retardation time, rise time, fall time and response time can be determined according to the graphics that are recorded by the recording device. 4.10 Influence of environmental temperature changes on the displayed value of the instrument The test is carried out in an environmental test box (chamber). The gas source for the experiment is placed outside the box (chamber). After the instrument is preheated, inlet the calibration gas of the specified concentration; record the displayed value AT0 after it is stable. Adjust the temperature of the test chamber to the lower temperature limit and the upper temperature limit respectively; the temperature change rate is not more than 1 °C/min; keep it for 4 h; record the displayed value AT1 of the instrument at the lower temperature limit and the displayed value AT2 of the instrument at the upper temperature limit; respectively find their differences with AT0, ΔAT1 and 4.15.3 Interference error of water vapor Inlet the dry zero calibration gas (the water content to volume ratio is less than 0.1%) into the instrument; record the displayed value A0C; then, pass the zero gas through the water vapor generator to produce about 1.9% ~ 2.0% water vapor concentration; repeat the measurement three times. The calculation method of interference error is the same as that of 4.15.2. During the test, avoid condensation of water vapor before entering the instrument. Note 1: If a bubbler is used, the temperature of the bubbler shall be controlled at 17°C ~ 18°C. Note 2: The accuracy of the prepared interference gas can be lower than the accuracy of the usual preparation of calibration gas. 4.16 Electromagnetic compatibility requirements 4.16.1 Electrostatic discharge immunity Test according to the contact discharge test procedure that is specified in GB/T 17626.2-2006. 4.16.2 Radiated radio-frequency electromagnetic field immunity Test according to the test procedure that is specified in GB/T 17626.3-2006. 4.16.3 Electrical fast transient/burst immunity Test according to the test procedure that is specified in GB/T 17626.4-1998. 4.16.4 Surge immunity test Test according to the test procedure that is specified in GB/T 17626.5-2008. 4.16.5 Immunity to conducted disturbances induced by radio-frequency fields Test according to the test procedure that is specified in GB/T 17626.6-2008. 4.16.6 Power frequency magnetic field immunity test Test according to the test procedure that is specified in GB/T 17626.8-2006. 4.16.7 Voltage dips, short interruptions and voltage variations immunity tests Test according to the test procedure that is specified in GB/T 17626.11-2006. 4.17 Output interface and output signal ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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