JJG 950-2000 Verification Procedure for Oil-in-Water Concentration Analyzer JJG950-2000 Standard download decompression password: www.bzxz.net
This procedure is applicable to the verification of oil-in-water concentration analyzers that are newly manufactured, in use, and after repair.

National Metrology Inspection Regulations of the People's Republic of China JJG950--2000
Dil Content in Water Analyzer2000 —03—07 Issued
200007—01 Implementation
State Administration of Quality and Technical Supervision Issued
JJ95u2000
Verification Regulation nf OilContent in Water Analyzer
.1.IG 950
This regulation has been approved by the National Quality and Technical Supervision Bureau on March 17, 2010, and will be implemented from July 1, 2000.
Owner: National Environmental Chemistry Technical Committee Drafting unit: Beijing Municipal Environmental Chemistry Research Institute Technical Committee for the project of this regulation is responsible for the interpretation of this regulation. Main drafters: Li Jinsi
Zheng Sigang
Zhang Lihe
Participating drafters:
Li Chengzhang
JJG 950—2000
(Beijing Metrology Testing Institute)
(Beijing Metrology Testing Institute)
(Beijing Metrology Testing Institute)
(Technical Service Department of Beijing Automotive Technology Research Institute)Scope·
3 Measuring performance requirements
3.1 Indication error
Resilience
Zero point drift
Stability
4 Application technical requirements
Appearance routine inspection
Insulation resistance
Influence of output voltage
5 Control of measuring instruments.
Verification conditions·
Verification equipment
Verification items and verification methods
Verification result processing,
Verification cycle·
J.IG 950—2000
Appendix A Oil Content Analyzer Calibration Record Form Calibration Certificate (Back) Format
Calibration Result Notice (Back) Format
Appendix Core
: (1)
(4)
1 Scope
JG 950—2000
Calibration Procedure for Oil Content Analyzer in Water
This regulation is applicable to the calibration of newly manufactured and used oil content analyzers in water (equipment that uses the infrared absorption principle to measure infrared content in water, hereinafter referred to as analyzers). 2 Overview
The instrument is mainly used to detect the concentration of organic hydrogenated compounds (HCO3) in water. The instrument consists of a sample processor, an analyzer, an amplifier, a digital voltmeter, etc. The system principle is shown in Figure 1. 1
Figure 1 Oil Content Depth Analyzer in Water Principle! Figure 1 - sample inlet: 2 - detector: 3 - extraction: 4 - sample pass 5 - tester; 7 - measurement principle: organic hydrocarbons in water samples are extracted with solvents, and measured by non-spectral (or spectroscopic) infrared absorption method. Mineral oil, plant oil and animal oil are all composed of hydrocarbons, which have strong absorption peaks in the 3.43um infrared band, and the extractant has no absorption peak near this band. Therefore, when a beam of infrared light passes through the extractant, the infrared light energy near 3.43 is absorbed and attenuated, and the attenuation is proportional to the oil content in the water sample. After testing and amplification, the oil content is directly displayed by the mathematical formula.
3 Metrological performance requirements
3.1 Error correction
Select the corresponding standard materials in the specified concentration range for calibration, and the error limit of the instrument is ±5%. 3.2 Reproducibility
Under the same measurement conditions, use the same standard materials to measure continuously for 6 times, and the relative standard deviation of the measured value should not be less than 2%.
3.3 Zero point drift
JJG 950 · 2000
Under the calibration conditions, after the instrument has been running continuously for 30nn, the zero point drift should not be less than 2%. 3.4 Stability
Under the calibration conditions, the stability should not be less than 5. 4 General technical requirements
1.1 Visual inspection and regular inspection
1.1 The instrument should be accompanied by the manufacturer's equipment instructions, and should clearly state the name of the instrument, the name of the company, the instrument number, the code number and the year of manufacture.
4.12 After the instrument is turned on and preheated, all indicators can work properly. The indicator should show the time. 4.1.3 The instrument should be able to adjust the zero point without any adjustment. 4.1.4 Under pressure, and the measuring circuit and related systems have no leakage, 4.2 Insulation
The insulation resistance of the instrument power cord to the grounding point of the shell should be 3? M! ! 4.3 For instruments using batteries, the power supply voltage should be within the allowable range specified in the manual. The indication error should meet the requirements of 3.1: When the power supply voltage is 22V-22V, 220V-33V, the instrument should meet the requirements of 3.1.
5 Measuring instrument control
5.1 Calibration system
5.1.1 Calibration environmental conditions
3.1.1.1 Ambient temperature: (2)-25)C
5.1.[.2 Relative sensitivity: 85%
5.1.2 Power supply: Output pressure: 220V122, frequency (50±1)H5.1.3 Good ventilation facilities must be equipped to prevent inhalation of carbon tetrachloride vapor. 5.2 Equipment for determination
5.2.1 4 100mL bottles, 2 50mL bottles, 2 20mL syringes, 3 10mL graduated aspirators. All the above equipment must be qualified.
5.2.2 Purchase of standard materials
The standard materials used for determination must be national grade II or above mineral oil standard materials: the total concentration of mineral oil standard materials should not be greater than 2%, and the concentration range is: No. 1: (4.5--5.5) mg/, No. 2: (9.-11.3) mg/ L.
5.2.3 Zero calibration liquid
Zero calibration liquid should be a guaranteed reagent (superior grade, about C: and purified by distillation. The temperature of the glass distiller is controlled at: (92 ± 2)], and ensure that the blank value of the entire measured wavelength range is less than 5 times the minimum scale value of the instrument.
5.2.4 Power supply: The output voltage is 220V ± 33V.2
3.2.5 Steady-state electricity (qualified by transfer)||tt| |5.2.6 Digital electric meter (certified). 5.3 Verification requirements and methods
5.1.1 Appearance and routine verification
JJG950:2000
It is carried out by self-test and hand feeling. The appearance of the instrument should meet the requirements of 4.1: 5.3.2 Calibration
After the instrument is stable, use the standard substance containing fast calibration liquid and No. 2 oil to calibrate the zero and The indication of the middle range is repeated 3 times. For multi-range instruments, calibration is first performed at the low range.
5.3.3 Use the calibrated instrument to inject No. 1, No. 2, and No. 3 variable oil standard materials into the instrument according to the requirements of the operating instructions 1 (to prevent the standard materials from being covered with a certain amount of water). Repeat the measurement 3 times, take the average value as the measured value, and calculate the indication reading difference of the instrument using formula (1). Meet the requirements of 3.1.
The average value of the three measured values ​​of the instrument, mg/L: the standard position of the standard substance of mineral oil, /I
2.3.4 Verticality
After the calibration piece must be inserted into the instrument, 3 special mineral oil standard substances are added. After the instrument is stable, read the received value and use the zero position calibration to eliminate the deviation. Repeat the above steps 5 times, calculate the actual standard deviation according to formula (2) and formula (3), and the result meets the requirements of 3.2.
Formula + S--Standard error:
--First measurement value:
(--Method average value of the number of measurements; --Number of measurements:
C-Standard error.
S.3.5 Multi-point shift
After the calibrated instrument is placed on the lowest base diameter block and the zero calibration liquid is inserted, record its reading value: The instrument is continuously running for 30 minutes, and the indication value is tested once every 5 minutes, and calculated according to the formula (+) z. The statistical results meet the requirements of 3.3 and the formula is: P
JG54-2000www.bzxz.net
Dox - Dr × g
6 The maximum value in the measurement:
The absolute value of the instrument is not the same as the value shown by the instrument; R The maximum range value of the instrument:
Z. Actual point drift.
5.3.6 Scale stability
Check the instrument and turn on the power supply. First, use the standard calibration fluid and No. 1 physical oil standard material to recalibrate the level and indicator, and read the first value of the instrument. Then measure the 3h connection stability using formula (5). The result should meet the requirements of 3 and 4.
D,- Rmm= Rm ×100
Wherein: R—the maximum measured value of the internal network; R——the minimum measured value of the instrument for 3h;
Center: number of standard materials: P——stability
5.3.7 Verification of insulation resistance
Cut off the power supply, turn off the power supply of the instrument and use the insulating meter to measure the resistance between the power supply and the outside of the instrument. The resistance should meet the requirements of 4.2.
5.3.8 Also the influence of full voltage
After the calibration of the instrument, use the AC source of the receiver, and the rated value is 220V122V, 220V-33V: For the extended use of the receiver, follow the instructions in the old book Yao Dingfan class. Under the above conditions, the instrument is tested at the learning point and the standard material is No. 2 mineral oil, respectively, 3 times, and the calculation is calculated by formula (1). The result should meet the requirements of 4.3.
5.4 The result of the inspection is to deal with
5.4.1, 4.2 and 4.3 of this regulation, the instrument after the mechanism selection and repair is sent to the light certificate, 5.4.2 of this regulation, the instrument that meets the normal inspection standards is issued with the inspection certificate 5: the inspection result of the qualified instrument is issued with the date of [noting the unqualified items].
5.5 Inspection cycle
The inspection cycle of the water component concentration analyzer is 1 year, and the last inspection certificate should be attached when it is sent. Appendix A
Inspection unit
Manufacturer
Instrument name
Specified ambient temperature
1 Appearance and routine inspection:
2 Display error determination
Mineral pool standard material
Concentration value (g)
3 Repeatability determination
Mineral pool standard material
Concentration value (m.)
Display value 1||t t||Equipoint drift determination
Time【mrin】
Qualitative
4. (6)
Insulation resistance measurement results:
JJG950—2000
Oil concentration analyzer calibration record
, certificate number
, factory number
, model
Indication value 2
7 power supply voltage Influence on the measurement results:
Verifier:
Verification date:
Verifier:
Indication value 3
Indication error
Relative standard
Appendix B
Verification items
More resistance
Indication error
Standard drift
Stability
Insulation resistance
Power supply voltage Influence
JJG950—2000
Verification certificate [back] format
Control data
Appendix
Verification items
Volatility
Indication error
Stability
Zero-point source
Range resistance
Influence of power supply voltage
Not including items:
.1JG 950—2000
Verification result notice (back format
Verification date
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