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JJG 880-2006 English PDF (JJG880-2006)

JJG 880-2006 English PDF (JJG880-2006)

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JJG 880-2006: Verification Regulation of Turbidimeters

This regulation applies to initial verification, subsequent verification and in-use verification of desktop and portable typhotoelectric turbidimeters for laboratory and field service that are displayed through Formazine turbidity unit and the display results can be converted into Formazine turbidity unit.
JJG 880-2006
JJF
National Metrology Technical Specifications
of the People's Republic of China
Turbidimeters
?????????
ISSUED ON. SEPTEMBER 06, 2006
IMPLEMENTED ON. MARCH 06, 2007
Issued by. State Administration for Quality Supervision and Inspection
and Quarantine
Verification Regulation of
Turbidimeters
Replacing JJG 880-1994
This regulation was approved by General Administration of Quality Supervision, Inspection and Quarantine on September 6, 2006, and shall be implemented from March 6, 2007.
Jurisdictional organization.
National Technical Committee on Environmental Stoichiometry
Drafting organizations.
National Institute of Metrology, China
Shanghai Institute of Measurement and Testing Technology
Beijing Institute of Measurement and Testing Technology
This regulation is entrusted to and shall be responsibly interpreted by National Technical Committee on Environmental Stoichiometry.
Main drafters of this regulation.
Zhang Wenge (National Institute of Metrology, China)
Participating drafters.
Qiu Yanhui (Beijing Institute of Measurement and Testing Technology)
Gu Jiayu (Beijing Institute of Measurement and Testing Technology)
Qi Xin (National Institute of Metrology, China)
Liu Junjie (National Institute of Metrology, China)
Table of Contents
1 Scope??...??5
2 References??...??5
3 Terms and unit of measurement??...??5
4 Overview??...??6
5 Requirements for metrological performance??...??6
5.1 Instrument?€?s zero-drift ... 6
5.2 Instrument?€?s indication stability ... 6
5.3 Instrument?€?s repeatability ... 6
5.4 Instrument?€?s indication error ... 6
6 General technical requirements??...??6
6.1 Appearance ... 7
6.2 Insulation resistance ... 7
7 Measuring instrument control??...??7
7.1 Verification conditions ... 7
7.2 Verification items ... 8
7.3 Verification method ... 8
8 Verification results handling??...??10
9 Verification cycle??...??10
Annex A Preparation of Zero Turbidity Water??...??11
Annex B Calibration of Turbidity Standard Piece??...??12
Annex C Format of Verification Record??...??13
Annex D Format of Inner Pages of Verification Certificate??...??15
Annex E Format of inner pages of verification results notification??...??16 Verification Regulation of Turbidimeters
1 Scope
This regulation applies to initial verification, subsequent verification and in-use verification of desktop and portable typhotoelectric turbidimeters for laboratory and field service that are displayed through Formazine turbidity unit and the display results can be converted into Formazine turbidity unit.
2 References
The following references apply to this regulation.
JJF 1001-1998 General Terms in Metrology and Their definitions
JJG 1015-2002 General Norm for Pattern Evaluation and Pattern Approval of Measuring Instruments
ISO 7027. 1999 Water quality- Determination of turbidity.
3 Terms and unit of measurement
Formazine -- Chinese translated name of Formazine;
This regulation adopts Formazine turbidity standard specified in International Standard ISO7027 and issued by International Standard Organization, and adopts the ?€?Unit?€? used in this standard as turbidity measurement unit. According to different measurement modes, there are mainly following turbidity units determined based on measurement standard of Formazine standard solution.
"FAU" (Formazine Attenuated Unit) -- Formazine light attenuation measurement unit; ?€?FNU?€? (Formazine Nephelometric Unit) -- Formazine light scattering measurement unit; NTU (Nephelometric Turbidity Unit) -- light scattering turbidity unit;
FTU (Formazine Turbidity Unit) -- Formazine turbidity unit;
EBC (European Brewery Convention) -- European brewing industry turbidity unit; ASBC (American Society Brewing Chemists) -- American brewing industry turbidity unit. Relations between these units are as follows.
1 FAU = 1 FNU = 1 NTU = 1 FTU
1 EBC = 4 FTU
A ASBC = 0.058 FTU
6.1 Appearance
6.1.1 The instrument shall be placed on platform stably; fasteners shall perform well; adjustable knobs, keys and switches shall work normally; displaying results of display unit shall be clear and complete.
6.1.2 The instrument shall indicate the trademark, name, model, specification, name of manufacturer, manufacturing number and manufacturing date; nameplate shall be clear and pasted at obvious place.
6.1.3 Inner and outer surfaces of measuring cell (transmitting part) shall be smooth, clean and free of scratches; measuring chamber is clean inside; measuring cell has normalized shape; measuring cell wall has a uniform thickness.
6.2 Insulation resistance
Insulation resistance between power supply terminal and metal piece of instrument shell shall not be less than 20 M??.
7 Measuring instrument control
Measuring instrument control includes initial verification, subsequent verification and in-use verification.
7.1 Verification conditions
7.1.1 Environmental conditions.
Environmental conditions. 15??C?€?30??C ;
Relative humidity. ???80 % RH;
Power supply. (220??22) V, frequency (50??1) Hz.
7.1.2 Equipment for verification
7.1.2.1 Turbidity standard solution. adopt Formazine national water quality turbidity standard solution (uncertainty is better than 3%, k=2)
7.1.2.2 Insulation resistance meter. 500 V, level 10.
7.1.2.3 Volumetric flask and pipette. level A.
7.1.2.4 Zero turbidity water. see Annex A for specific requirements.
7.1.2.5 Polymer turbidity suspension liquid of which the changing of turbidity value within 1 h is not greater than 0.2% (turbidity solution of which the spherical monodisperse polymer particles of 0.1??m ~ 0.5??m are uniformly suspended in liquid and has a stable turbidity value within a period of time).
Annex A
Preparation of Zero Turbidity Water
Use microfiltration membrane of which the pore diameter is not greater than 0.2 ??m to filter distilled water (or electrodialysis water, or ion exchange water); filtration shall be repeated at least once; The filter liquor obtained is the zero turbidity water for verification. Zero turbidity water is used for turbidimeter zero adjustment and dilution of Formazine standard solution.
Annex B
Calibration of Turbidity Standard Piece
The turbidity standard piece (or standard pipe, hereinafter referred to as standard piece) is the accessory of instrument to be verified and is used for verification during field measurement. For standard piece of which the nominal value is indicated through Formazine turbidity unit, it shall be allocated with Formazine standard solution of which the turbidity value is close to the nominal value Tn of the standard piece; calculate turbidity value Ts of standard solution according to dilution ratio. Use turbidimeter to be verified to measure turbidity value Tmi of standard piece to be verified in same conditions; meanwhile, measure Formazine standard solution for 5 to 6 times repeatedly; calculate average measured value Tms.
Modified value of nominal value of standard piece is as follows.
For standard piece of which the nominal value is indicated with other turbidity unit or that has no nominal value, it shall take following Formula as the standard value of standard piece to be verified.
Where, Ts - Standard value of Formazine turbidity standard solution;
Tms - Measured value of Formazine turbidity standard solution;
Tn - Nominal value of turbidity standard piece;
Tmn - Measured value of turbidity standard piece.
Annex E
Format of inner pages of verification results notification
No. Verification Item Technical Requirements Verification Results
1 Appearance
2 Zero-drift
3 Indication stability
4 Repeatability
5 Indication error
6 Insulation resistance
Nonconformance item.

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