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JJG 821-2005 PDF in English


JJG 821-2005 (JJG821-2005) PDF English
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JJG 821-2005: PDF in English

JJG 821-2005
METERING & VERIFICATION REGULATION
OF THE PEOPLE’S REPUBLIC OF CHINA
Replacing JJG 821-1993
Total organic carbon analyzer
ISSUED ON: SEPTEMBER 05, 2005
IMPLEMENTED ON: MARCH 05, 2006
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC
Table of Contents
1 Scope ... 5 
2 Overview ... 5 
3 Measurement performance requirements ... 5 
3.1 Indication error for inorganic carbon detection ... 5 
3.2 Indication error of organic carbon detection ... 5 
3.3 Repeatability for inorganic carbon detection ... 5 
3.4 Repeatability for organic carbon detection ... 5 
4 General technical requirements ... 6 
4.1 Visual inspection ... 6 
4.2 Insulation resistance and dielectric strength ... 6 
5 Control of measuring instrument ... 6 
5.1 Verification conditions ... 6 
5.2 Verification Items ... 7 
5.3 Verification method ... 8 
5.4 Processing of verification results ... 11 
5.5 Verification period ... 11 
Appendix A Preparation method of water for standard solution ... 12 
Appendix B Preparation method of standard solutions ... 13 
Appendix C Verification record format ... 14 
Appendix D Inner page format of verification certificate ... 15 
Appendix E Format of the inner page of the verification result notification letter ... 16 
Verification regulation of total organic carbon analyzer
1 Scope
This Regulation applies to the initial verification, subsequent verification, in-use
inspection, of the total organic carbon analyzer.
2 Overview
For the total organic carbon analyzer (hereinafter referred to as TOC analyzer), when
measuring the carbon content in a solution or solid state sample, it oxidizes the carbon
element in the sample to carbon dioxide; uses the corresponding relationship between
carbon dioxide and carbon mass, to obtain the content of carbon in the sample.
The TOC analyzer is mainly composed of the following parts: Sampling device, reactor,
gas-liquid separator, non-dispersive infrared carbon dioxide detector, data processing
unit.
3 Measurement performance requirements
3.1 Indication error for inorganic carbon detection
The indication error limit of the inorganic carbon detection is ±4% (relative error).
3.2 Indication error of organic carbon detection
The indication error limit of organic carbon detection is ±5% (relative error).
3.3 Repeatability for inorganic carbon detection
The repeatability of inorganic carbon detection shall be better than 3%.
3.4 Repeatability for organic carbon detection
The repeatability of organic carbon detection shall be better than 3%.
4 General technical requirements
4.1 Visual inspection
4.1.1 The instrument has no damage, deformation and other phenomena, that affect its
work. The instrument name, model, exit-factory serial number, manufacturing time,
manufacturer name, etc. shall be complete and clear. Dangerous parts (high temperature,
strong light, etc.) shall be clearly marked. The manufacturer's instruction manual is
attached.
4.1.2 The structure of the instrument is complete. The components and cable plug-ins
are connected reliably. The accessories are complete. All adjustment knobs, buttons,
switches can work normally. The indication scale or digital display of the instrument
shall be clear. The performance of the instrument, which has a recorder, shall meet the
relevant technical requirements.
4.1.3 Stainless steel pipes or PTFE pipes shall be used for gas pipelines. Each joint shall
be tight and firm. There is no leak under the operating pressure.
4.2 Insulation resistance and dielectric strength
4.2.1 Insulation resistance
For the instrument using 220 V AC power supply, the insulation resistance of the phase
line of the instrument power supply to ground shall not be less than 20 MΩ.
4.2.2 Dielectric strength
For instruments, which use 220 V AC power supply, the dielectric strength of the phase
line of the power supply to the ground shall be able to withstand the test of AC voltage
1500 V, frequency 50 Hz, for a duration of 1 min, without breakdown and arcing.
5 Control of measuring instrument
The control of the instrument includes initial verification, subsequent verification, in-
use inspection.
5.1 Verification conditions
5.1.1 Environmental conditions
Ambient temperature is (20 ± 10) °C, relative humidity is ≤ 85%, power supply voltage
is (220 ± 22) V.
5.1.2 Standard materials and equipment for verification
5.1.2.l Standard material for sodium carbonate purity
National grade-2 standard material. Uncertainty of purity value: 0.02%, k = 2.
5.1.2.2 Standard material for potassium hydrogen phthalate purity
National grade-2 standard material. Uncertainty of purity value: 0.02%, k = 2.
5.1.2.3 Analytical balances
The minimum division value is 0.1 mg.
5.1.2.4 Glass measuring device
Grade A.
5.1.2.5 Blank water used for calibrating the standard solution of the instrument (see
Appendix A for the preparation method)
5.1.2.6 Insulation resistance gauge
500 V, grade 10.
5.1.2.7 Dielectric strength tester (voltage greater than 1.5 kV)
5.1.3 Other requirements
5.1.3.1 Instrument placement
The instrument shall be placed on the workbench stably. There is no strong light directly
on the instrument, strong magnetic field, electric field interference, or vibration around
the instrument. The indoor air is fresh and well ventilated.
5.1.3.2 Instrument carrier gas
The pressure and flow of the carrier gas source are stable at the specified values of the
instrument.
5.2 Verification Items
The verification items are as shown in Table 1.
Appendix B
Preparation method of standard solutions
B.1 Equipment needed to prepare the solution
The balances, pipettes, volumetric flasks used shall be subject to quantitative
verification.
B.2 Processing of chemical reagents
B.2.1 Processing of anhydrous sodium carbonate
Place the anhydrous sodium carbonate in a porcelain crucible. Dry it at 270 °C, for 4 h.
Then place it in a desiccator to cool, for later use.
B.2.2 Processing of anhydrous potassium hydrogen phthalate
Put potassium hydrogen phthalate in a weighing bottle. Then dry it in an oven at 118 °C,
for 2 h. Take it out and put it in a desiccator to cool it, for later use.
B.3 Preparation of standard solutions
B.3.1 Inorganic carbon standard solution
Accurately weigh a certain amount of anhydrous sodium carbonate. Dissolve it in pure
water. Transfer it to a volumetric flask. Dilute it to the mark. Shake well. Accurately
calculate the concentration of the solution.
B.3.2 Organic carbon standard solution
B.3.2.1 Potassium hydrogen phthalate standard solution
Accurately weigh a certain amount of potassium hydrogen phthalate. Dissolve it in pure
water. Transfer it to a volumetric flask. Dilute it to the mark. Shake well. Accurately
calculate the concentration of the solution.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.