Some standard content:
National Metrology Verification Regulation of the People's Republic of China JJG880—2006
Turbidimeters
Promulgated on 2006-09-06
The General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China issued JJG 880--2006
Verification Regulation of
Turbidimeters
JJG880—2006
Replaces JJG880—1994
This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on September 6, 2006, and took effect on March 6, 2007.
Responsible unit: National Technical Committee for Environmental Chemical Metrology Drafting unit: China Institute of Metrology Participating drafting unit: Shanghai Institute of Metrology and Testing Technology Beijing Institute of Metrology and Testing Science
This regulation is entrusted to the National Technical Committee for Environmental Chemical Metrology to be responsible for the interpretation of this regulation Main drafter:
Zhang Wenge
Participating drafter:
Qiu Yanhui
Gu Jiayu
Liu Junjie
.JIG 880—2006
(China Institute of Metrology)
(Shanghai Institute of Metrology and Testing Technology) (Beijing Institute of Metrology and Testing Science) (China Institute of Metrology)
(China Institute of Metrology)
References
Terms and measurement units
Metrological performance requirements,
Instrument zero drift
Instrument indication stability
Instrument repeatability
Instrument indication error
General technical requirements
Continued attachment,
Control of meter-based instruments·||tt ||Inspection conditions
Inspection items·
Inspection methods
Handling of inspection results·
Inspection period.
Appendix A
Appendix B
Appendix C
Appendix D
Appendix E
Preparation of zero turbidity water
Calibration of turbidity standard
Inspection record format
Inner format of inspection certificate
Inner page format of inspection result notice
JJG880—2006
(2)
1 Scope
JJG 880—2006
Verification Procedure for Turbidimeters
This procedure is applicable to the initial verification, subsequent verification and in-use inspection of benchtop and portable photoelectric turbidimeters used in laboratories and fields that display turbidity in Fortrazine units and whose displayed results can be converted into Formazine turbidity units.
References
This procedure refers to the following:*
SHOH NIESTEI
JJF1001—199% Angle Measurement Group
JJG 1015—2U
JSO 7027 :
Use of this specification:
3 Terms and calculations
Formazine
Measuring instruments
Water turbidity measurement
Please note the following:
-Fornazine turbidity
This specification refers to the international standard established by the Organization for Chemical Industry, and the "degree" used in the standard (the following is the standard liquid as the measurement standard
"\FAU\
"FNU\
FTU (FOI
Chinese name of the cited literature:
sthazineattenuatedhit)
nazinenepheldm
Dnetric Turbidity Unit EBC (Eutopd ) ASBC (AmerieR&wery Copive S0) 7027 stipulates the turbidimetric measurement unit. According to different measurement methods, the main measurement units are: -Fornazine light attenuation measurement unit; Formazine light scattering measurement unit; Turbidimetric unit Formazine Bedrwin Chemiets? The differences between these units are as follows: EN L FNU = YIAAFMETROL 1 ASBC-0.8FTU
4 Overview
Turbidity Unit
Manufacturing Turbidity
American Brewed Turbidity Unit,
Turbidimeter (hereinafter referred to as the instrument) is an instrument used to measure the scattering or attenuation of light produced by insoluble particulate matter suspended in a transparent liquid, and to quantitatively characterize the content of these floating particulate matter. The photoelectric turbidimeter is mainly composed of a light source, a light collimation unit, a sample measuring cell, a measuring chamber, a photoelectric detection element and a display unit. According to its measuring principle or method, it can be divided into several methods such as light transmission attenuation, light scattering (right-angle scattering, forward scattering and surface scattering), scattering projection ratio and integrating sphere measurement. 5.1 Instrument zero drift
JJG 880—2006
Figure 1 Principle of photoelectric turbidimeter
1—Light source: 2—Light collimation unit: 3—Sample source, measurement cell, 4—Optical center detection element
The instrument zero drift shall not exceed ±1.5% of the full scale value of the measuring range within 30min. 5.2 Instrument indication stability
The indication stability of the instrument within 30min shall not exceed ±1.5% of the full scale value of the measuring range. 5.3 Instrument repeatability
When the same sample is measured repeatedly, the relative standard deviation of the measured value shall not exceed 2%. 5.4 Instrument indication error
The relative error of the instrument indication shall not exceed 10%. 6 General Technical Requirements
6.1 Appearance
6.1.1 The instrument should be able to be placed on the platform stably, all fasteners should be well tightened, all adjustment knobs, buttons and switches should work normally, and the display unit should show the results clearly and completely: 61.2 The instrument should be marked with the trademark, name, model, specification, manufacturer name, factory number and manufacturing date, and the nameplate should be clear and posted in a conspicuous place.
6.1.3 The inner and outer surfaces of the measuring pool wall (translucent part) should be smooth and free of scratches; the measuring room should be clean, the measuring pool should be regular in shape, and the thickness of the pool should be uniform.
6.2 Insulation resistance
The insulation resistance between the power supply terminal and the metal parts of the instrument casing should not be less than 20M2.7 Measuring instrument control
Measuring instrument control includes: initial calibration, subsequent calibration and in-use inspection. 7.1 Calibration conditions
7.1.1 Environmental conditions:
Ambient temperature: 15~30;
: Relative humidity: 80%RH;
Power supply: (220=22)V, frequency (50!1)H2.2
7.1.2 Calibration equipment
JJG 880—2006
7.1.2.1 Turbidity standard solution: Use the Formageng National Water Quality Turbidity Standard Solution (uncertainty is better than 3%, k-2)
7.1.2.2 Insulation resistance meter: 500 V, 10 grade. 7.1.2.3 Volumetric flask and pipette arm: Grade A.
7.1.2.4 Zero turbidity water: see Appendix A for specific requirements. 7.1.2.5 Polymer turbidity suspension with a turbidity value change of no more than 0.2% within 1 hour (spherical monodisperse polymer particles with a particle size range of 0.1um-0.5um, uniformly suspended in liquid, turbidity solution with stable turbidity value over a period of time).
Verification Items
1Verification Items||tt ||Verification Items
Insulation Resistance
Instrument Zero Drift
Instrument Indication Stability
Instrument Repeatability
Instrument Indication Error
First Verification
Note: 1“→” indicates the items to be inspected, “
” indicates the items not to be inspected
Subsequent Verification
2For the repaired instrument. If the safety is affected, the first verification shall be carried out as per the following: 7.3 Verification Method
7.3.1 Appearance inspection
Inspect by daily observation and touch.
7.3.2 Insulation resistance
Inspection during use
The instrument is not connected to the working power supply, and the switch is in the on position: Connect the terminals of the insulation resistance meter to the AC input terminal and the casing of the instrument respectively, and operate and read the indication of the insulation resistance meter according to the instructions of the insulation resistance meter: 7.3.3 Calibrate the instrument before verification
7.3.3.1. For instruments that need to be calibrated with Forrmazine turbidity standard liquid, use the turbidity standard liquid in 7.1.2.1 and follow the instructions of the instrument manual. 7.3.3.2 For instruments that need to be calibrated using standard sheets (tubes) marked with Formazine turbidity units, first use Formazine turbidity standard solution to calibrate the turbidity value of the standard sheet (tube). Use this standard value as the calibration value. Calibrate the instrument according to the instructions of the instrument under test before starting the verification. This calibration value should be indicated in the verification results. For specific calibration methods, see Appendix B.
7.3.4 Instrument zero drift
Within the instrument's lowest range T, adjust the zero point T with zero-degree water and continue to observe for 30 Record the instrument indication every 3
JIG 880—2006
5 min, and calculate the zero offset AT by the following formula: Take the AT with the largest absolute value as the instrument zero drift.
Instrument minimum full scale value
7.3.5 Instrument indication stability
T - T×100%
When the upper limit of the range is not more than 50 NTU or within the commonly used range, select a polymer turbidity suspension with a nominal value of about 80% of the range for measurement. After the instrument reading is stabilized, read the indication and continue to observe for 30 minutes. Record the instrument indication T every SYO ONIST
5min. Qualitative analysis is performed by the following formula.
武中: 7.3.6 Instrument repeatability When the upper limit of the range is not high, the turbidity suspension is measured continuously and the relative standard deviation is the full scale value: 50 NTU range, measure 8 times, where the value of the ·th measurement is in the formula; T is the average measurement value - the largest single measurement value, which is the stability of the instrument indication. Select the polymer with nominal content at % within this range. Calculate the average measurement deviation according to the following formula: 5r is the relative standard deviation of the measurement. LOGY
Instrument indication error
Select the standard solution (3) of the company-(bottle) Formiazinc
Within the range of not more than 50NTU, evenly select five measurement points, accurately dilute and prepare the standard solution T of the corresponding turbidity value, measure each concentration value 3 times, and get the measured value: calculate its average value I, and calculate the relative error A of the instrument indication under the above 5 conditions according to formula (6): take the largest A, which represents the instrument indication error calibration result △, a,
× 100%
In the formula: T is the nominal value of the configured standard solution; T is the average value of the turbidity standard solution measurement;
A is the relative error of indication.
JJG 881—2006
For instruments with multiple ranges, select a standard solution with a turbidity as the middle measurement point of the range in other ranges and calibrate it according to the above method.
Handling of verification results
Instruments that pass the verification according to the requirements of this regulation shall be issued with a verification certificate, the inner page format of which is shown in Appendix D; meters that do not meet the requirements of this regulation shall be issued with a verification result notice, the inner page format of which is shown in Appendix E. ENHH
3STOH of the calibration period of the turbidimeter
Verification cycle
METROL
Appendix A
JJG880—2006
Preparation of zero turbidity water
Use a microporous filter membrane with a pore size of no more than 0.2um to filter distilled water (or electrodialysis water, ion exchange water), and filter it repeatedly for more than 2 times. The filtrate obtained is the zero turbidity water used for verification. Zero turbidity water is used for zero point adjustment of turbidimeter and dilution of Formazine standard solution. 6
Appendix B
JJG880—2006
Calibration of turbidity standard film
The turbidity standard film (or standard tube, hereinafter referred to as standard film) is an accessory of the instrument to be calibrated and is used for instrument calibration during on-site measurement. For standard films with nominal values marked in Farnazine units, it is necessary to prepare a Farmazine standard solution with a turbidity value close to the nominal value 1 of the standard film, and calculate the turbidity value T of the standard solution according to the dilution ratio. Using a turbidometer to be tested, under the same conditions, measure the turbidity value Tm of the standard piece to be tested and repeat the measurement of Fornazine standard solution 56 times, and calculate the average measured value Tms. The correction value of the nominal value of the standard piece is
X 100%
For standard pieces marked with nominal values in other turbidity units or without nominal values, the following formula is used as the standard value of the standard piece after calibration:
Wherein: T—standard value of Formazine turbidity standard solution; T
measured value of Formazine turbidity standard solution; T,—nominal value of turbidity standard piece;
measured value of turbidity standard piece.
Appendix
Instrument name:
Production number:
Instrument manufacturer:
Certificate number:
Principle:
C.1 Verification conditions
Air temperature:
Instruments and equipment for verification:
C, 2 Verification basis
JJG 880—2006
(.3 Verification results
C.3.1 Appearance inspection
Instrument zero
Range:
Continuous observation time
Instrument measurement value
Zero drift:
C.3.3 Instrument indication stability
Range:
Continuous observation time
Instrument measurement value
Indication stability:
JJG 880—2006
Verification record format
Instrument model:
Equipment number:
Inspection unit:
Record number:
Humidity:
Verification procedures
LISHING
METROLOCY
C.4 Instrument repeatability (expressed as relative standard deviation) Range:
Measurement sequence
Instrument measurement value
Instrument repeatability:
Maximum drift
Maximum drift7.3.6 Instrument repeatability When the upper limit of the range is not high, the turbidity suspension is measured continuously and the relative standard deviation is the full scale value: 50 NTU range, measure 8 times, where the value of the ·th measurement is in the formula; T is the average measurement value - the largest single measurement value, which is the stability of the instrument indication. Select the polymer with nominal content at % within this range. Calculate the average measurement deviation according to the following formula: 5r is the relative standard deviation of the measurement. LOGY
Instrument indication error
Select the standard solution (3) of the company-(bottle) Formiazinc
Within the range of not more than 50NTU, evenly select five measurement points, accurately dilute and prepare the standard solution T of the corresponding turbidity value, measure the concentration value 3 times, and get the measured value: calculate the average value I, and calculate the relative error A of the instrument indication under the above 5 conditions according to formula (6): take the largest A, which represents the instrument indication error calibration result △, a,
× 100%
In the formula: T is the nominal value of the configured standard solution; T is the average value of the turbidity standard solution measurement;
A is the relative error of indication.
JJG 881—2006
For instruments with multiple ranges, select a standard solution with a turbidity as the middle measurement point of the range in other ranges and calibrate it according to the above method.
Handling of verification results
Instruments that pass the verification according to the requirements of this regulation shall be issued with a verification certificate, the inner page format of which is shown in Appendix D; meters that do not meet the requirements of this regulation shall be issued with a verification result notice, the inner page format of which is shown in Appendix E. ENHH
3STOH of the calibration period of the turbidimeter
Verification cycle
METROL
Appendix A
JJG880—2006
Preparation of zero turbidity water
Use a microporous filter membrane with a pore size of no more than 0.2um to filter distilled water (or electrodialysis water, ion exchange water), and filter it repeatedly for more than 2 times. The filtrate obtained is the zero turbidity water used for verification. Zero turbidity water is used for zero point adjustment of turbidimeter and dilution of Formazine standard solution. 6
Appendix B
JJG880—2006
Calibration of turbidity standard film
The turbidity standard film (or standard tube, hereinafter referred to as standard film) is an accessory of the instrument to be calibrated and is used for instrument calibration during on-site measurement. For standard films with nominal values marked in Farnazine units, it is necessary to prepare a Farmazine standard solution with a turbidity value close to the nominal value 1 of the standard film, and calculate the turbidity value T of the standard solution according to the dilution ratio. Using a turbidometer to be tested, under the same conditions, measure the turbidity value Tm of the standard piece to be tested and repeat the measurement of Fornazine standard solution 56 times, and calculate the average measured value Tms. The correction value of the nominal value of the standard piece is
X 100%
For standard pieces marked with nominal values in other turbidity units or without nominal values, the following formula is used as the standard value of the standard piece after calibration:
Wherein: T—standard value of Formazine turbidity standard solution; T
measured value of Formazine turbidity standard solution; T,—nominal value of turbidity standard piece;
measured value of turbidity standard piece.
Appendix
Instrument name:
Production number:
Instrument manufacturer:
Certificate number:
Principle:
C.1 Verification conditions
Air temperature:
Instruments and equipment for verification:
C, 2 Verification basis
JJG 880—2006
(.3 Verification results
C.3.1 Appearance inspection
Instrument zero
Range:
Continuous observation time
Instrument measurement value
Zero drift:
C.3.3 Instrument indication stability
Range:
Continuous observation time
Instrument measurement value
Indication stability:
JJG 880—2006
Verification record format
Instrument model:
Equipment number:
Inspection unit:
Record number:
Humidity:
Verification procedures
LISHING
METROLOCY
C.4 Instrument repeatability (expressed as relative standard deviation) Range:
Measurement sequence
Instrument measurement value
Instrument repeatability:
Maximum drift
Maximum drift7.3.6 Instrument repeatability When the upper limit of the range is not high, the turbidity suspension is measured continuously and the relative standard deviation is the full scale value: 50 NTU range, measure 8 times, where the value of the ·th measurement is in the formula; T is the average measurement value - the largest single measurement value, which is the stability of the instrument indication. Select the polymer with nominal content at % within this range. Calculate the average measurement deviation according to the following formula: 5r is the relative standard deviation of the measurement. LOGY
Instrument indication error
Select the standard solution (3) of the company-(bottle) Formiazinc
Within the range of not more than 50NTU, evenly select five measurement points, accurately dilute and prepare the standard solution T of the corresponding turbidity value, measure the concentration value 3 times, and get the measured value: calculate the average value I, and calculate the relative error A of the instrument indication under the above 5 conditions according to formula (6): take the largest A, which represents the instrument indication error calibration result △, a,
× 100%
In the formula: T is the nominal value of the configured standard solution; T is the average value of the turbidity standard solution measurement;
A is the relative error of indication.
JJG 881—2006
For instruments with multiple ranges, select a standard solution with a turbidity as the middle measurement point of the range in other ranges and calibrate it according to the above method.
Handling of verification results
Instruments that pass the verification according to the requirements of this regulation shall be issued with a verification certificate, the inner page format of which is shown in Appendix D; meters that do not meet the requirements of this regulation shall be issued with a verification result notice, the inner page format of which is shown in Appendix E. ENHH
3STOH of the calibration period of the turbidimeter
Verification cycle
METROL
Appendix A
JJG880—2006
Preparation of zero turbidity water
Use a microporous filter membrane with a pore size of no more than 0.2um to filter distilled water (or electrodialysis water, ion exchange water), and filter it repeatedly for more than 2 times. The filtrate obtained is the zero turbidity water used for verification. Zero turbidity water is used for zero point adjustment of turbidimeter and dilution of Formazine standard solution. 6
Appendix B
JJG880—2006
Calibration of turbidity standard film
The turbidity standard film (or standard tube, hereinafter referred to as standard film) is an accessory of the instrument to be calibrated and is used for instrument calibration during on-site measurement. For standard films with nominal values marked in Farnazine units, it is necessary to prepare a Farmazine standard solution with a turbidity value close to the nominal value 1 of the standard film, and calculate the turbidity value T of the standard solution according to the dilution ratio. Using a turbidometer to be tested, under the same conditions, measure the turbidity value Tm of the standard piece to be tested and repeat the measurement of Fornazine standard solution 56 times, and calculate the average measured value Tms. The correction value of the nominal value of the standard piece is
X 100%
For standard pieces marked with nominal values in other turbidity units or without nominal values, the following formula is used as the standard value of the standard piece after calibration:
Wherein: T—standard value of Formazine turbidity standard solution; T
measured value of Formazine turbidity standard solution; T,—nominal value of turbidity standard piece;
measured value of turbidity standard piece.
Appendix
Instrument name:
Production number:
Instrument manufacturer:
Certificate number:
Principle:
C.1 Verification conditions
Air temperature:
Instruments and equipment for verification:
C, 2 Verification basis
JJG 880—2006
(.3 Verification results
C.3.1 Appearance inspection
Instrument zero
Range:
Continuous observation time
Instrument measurement value
Zero drift:
C.3.3 Instrument indication stability
Range:
Continuous observation time
Instrument measurement value
Indication stability:
JJG 880—2006
Verification record format
Instrument model:
Equipment number:
Inspection unit:
Record number:
Humidity:
Verification procedures
LISHING
METROLOCY
C.4 Instrument repeatability (expressed as relative standard deviation) Range:
Measurement sequence
Instrument measurement value
Instrument repeatability:
Maximum drift
Maximum drift1 Verification conditions
Air temperature:
Verification instruments and equipment:
C, 2 Verification basis
JJG 880—2006
(.3 Verification results
C.3.1, Appearance inspection
Instrument zero
Range:
Continuous observation time
Instrument measurement value
Zero drift:
C.3.3 Instrument indication stability
Range:
Continuous observation time
Instrument measurement value
Indication stability:
JJG 880—2006
Verification record format
Instrument model:
Equipment number:
Inspection unit:
Record number:
Humidity:
Verification procedures
LISHING
METROLOCY
C.4 Instrument repeatability (expressed as relative standard deviation) Range:
Measurement sequence
Instrument measurement value
Instrument repeatability:
Maximum drift
Maximum drift1 Verification conditions
Air temperature:
Verification instruments and equipment:
C, 2 Verification basis
JJG 880—2006
(.3 Verification results
C.3.1, Appearance inspection
Instrument zero
Range:
Continuous observation time
Instrument measurement value
Zero drift:
C.3.3 Instrument indication stabilitybZxz.net
Range:
Continuous observation time
Instrument measurement value
Indication stability:
JJG 880—2006
Verification record format
Instrument model:
Equipment number:
Inspection unit:
Record number:
Humidity:
Verification procedures
LISHING
METROLOCY
C.4 Instrument repeatability (expressed as relative standard deviation) Range:
Measurement sequence
Instrument measurement value
Instrument repeatability:
Maximum drift
Maximum drift
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