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JJG 880-2006Verification Regulation of Turbidimeters (English PDF)

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Issued by

State Administration for Quality Supervision and Inspection and Quarantine Verification Regulation of

Level / Type

National · Mandatory

Issue date

September 6, 2006

Implementation date

March 6, 2007

Scope

JJG 880-2006 (Verification Regulation of Turbidimeters) is available as an English-translated PDF.

JJG 880-2006 is the Chinese standard "Verification Regulation of Turbidimeters".

Its scope clause reads: 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.

Its clauses include references; terms and unit of measurement; overview; requirements for metrological performance; general technical requirements; measuring instrument control; verification results handling; verification cycle.

It was issued by the State Administration for Quality Supervision and Inspection and Quarantine Verification Regulation of on 2006-09-06 and took effect on 2007-03-06.

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Document preview — JJG 880-2006

National Standard of the People's Republic of China

Issued by: State Administration for Quality Supervision and Inspection and Quarantine Verification Regulation of

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

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.

4 Overview

Turbidimeter (hereinafter referred to as the instrument) is an instrument used to measure the degree of scattering or attenuation of light generated by insoluble particulate matters suspended in transparent liquid, and make quantitative characterization of content of these suspended particulate matters.

5 Requirements for metrological performance

5.1 Instrument’s zero-drift

Instrument’s zero-drift shall not exceed ±1.5% of full scale value, within the measuring range in 30 min.

5.3 Instrument’s repeatability

When measuring the same sample repeatedly, relative standard deviation of measured value shall not be greater than 2%.

5.4 Instrument’s indication error

Relative indication error of instrument shall not be greater than ±10%.

6 General technical requirements

6.1 Appearance

6.2 Insulation resistance

Insulation resistance between power supply terminal and metal piece of instrument shell shall not be less than 20 Mohm.

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

7.2 Verification items

7.3 Verification method

7.3.1 Appearance inspection

Use visual inspection and hand-feeling inspection.

7.3.2 Insulation resistance

The instrument is not switched to working power at first; place the switch at on-position;

connect terminals of insulation resistance meter to AC input terminal of instrument and enclosure respectively; operate in accordance with operation instructions of insulation resistance meter; read the indicating value of insulation resistance meter.

7.3.3 Instrument calibration before verification

7.3.5 Instrument’s indication stability

Within a common-use range or a range of which the upper limit of measuring range is not greater than 50 NTU, select polymer turbidity suspension liquid of which the nominal value is at about 80% of the measuring range; read indicating value T1 after Instrument’s reading become stable; observe instrument’s indicating value T1 for 30 min continuously;

record instrument’s indicating value Ti every 5 min. Calculate indication stability according to following Formula; take deltai with maximum absolute value to show instrument’s indication stability.

7.3.7 Instrument’s indication error

Select Formazine standard solution (strong) from the same one (bottle); within a range of which the upper limit of measuring range is not greater than 50 NTU, take 5 measuring points uniformly; accurately dilute standard solution Ts that is used to prepare corresponding turbidity value; measure each concentration value for 3 times to obtain measured value Tm and average value Tm;

8 Verification results handling

Instrument that is verified qualified according to this regulation is awarded verification certificate; see Annex D for the format of inner pages.

9 Verification cycle

Verification cycle of turbidimeter is 1 year.

Annex A

Preparation of Zero Turbidity Water

Use microfiltration membrane of which the pore diameter is not greater than 0.2 µm 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.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 16 pages — is available in the English PDF.

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