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SH-21A
This instrument is mainly used for measuring oil content in surface water, groundwater, and industrial wastewater. It can also be used for monitoring
Product details
Compliant with national standards:
HJ 637-2018 "Determination of Water Quality - Petroleum, Animal and Plant Oils - Infrared Spectrometric Method"
GB3838-2002 Surface Water Environmental Quality Standards
GB18483-2001 Emission Standard for Cooking Fumes in the Catering Industry
GB18918-2002 Pollutant Discharge Standards for Urban Sewage Treatment Plants
Technical principle:
According to the HJ637-2018 standard, oil substances in the sample are extracted with tetrachloroethylene to determine the total oil content. Then, the extraction solution is adsorbed with magnesium silicate to remove polar substances such as animal and vegetable oils, and petroleum substances are determined. The content of total oil and petroleum is calculated based on the absorbance A2930, A2960, and A3030 at spectral bands with wave numbers of 2930cm-1 (C-H bond in CH2 group), 2960cm-1 (stretching vibration of C-H bond in CH3 group), and 3030cm-1 (stretching vibration of C-H bond in aromatic ring), respectively, using correction coefficients. The content of animal and plant oils is the difference between the content of oils and petroleum.
The instrument comes with an embedded 10.8-inch Windows 10 system tablet with full HD display;
Built in professional oil testing software, with clear spectra and the ability to distinguish various interference phenomena;
The software has functions such as infrared spectrum analysis, spectrum storage, data query, statistical calculation, printing, etc;
Integrated design of opto mechatronics and electrically modulated light source to improve instrument reliability;
High accuracy: The error of each measurement does not exceed ± 1.5%;
Baseline drift less than 0.005AU/60min;
Direct reading function with non dispersive measurement results, no need for conversion;
performance parameter | |
Basic measurement range |
0.0～120mg/L |
Minimum detection limit |
0.0008mg/L (water sample concentration) |
Linear correlation coefficient |
r﹥0.999 |
Maximum measured concentration |
100% oil |
Wavenumber range |
3400cm-1 to 2400cm-1 (i.e. 2941nm to 4167nm) |
repeatability |
The RSD of the 30-40mg/L oil standard sample measured 11 times is ≤ 0.6% or the RSD of the 0.5mg/L water sample is ≤ 2%. The optical and electrical systems of the instrument are self-contained and highly integrated, thereby improving the reliability and repeatability of the instrument. |
Wave number accuracy and repeatability |
± 0.5cm-1. Using positioning calibration, oil samples above 30mg/L are automatically calibrated at 2930cm-1, 2960cm-1, and 3030cm-1, eliminating the influence of human positioning |
Correction coefficient accuracy |
Using carbon tetrachloride as a reference solution and a 4cm colorimetric dish, measure 0mg/L, 5mg/L, 20mg/L, 50mg/L, and 100mg/L petroleum standard solutions with an error of ± 5%. |
Range of absorbance |
0.0000 to 3.0000 AU (i.e. transmittance of 100% to 1% T) |
Method Detection Limit |
When the sample volume is 1000ml and the extraction solution volume is 25ml, the detection limit is 0.01mg/L; |
IDLs |
DL ≤ 0.04mg/L (3 times SD of 11 measurements of carbon tetrachloride blank solution); |
scanning speed |
Full spectrum scanning, 30 seconds/time; Non dispersive infrared method for 2 seconds |
Baseline stability |
Using mechanical cutting technology to automatically adjust the zero point (eliminating the influence of baseline drift) to improve the long-term stability of the signal; |
solvent selection |
Can use tetrachloroethylene, carbon tetrachloride S-316、 Trichlorotrifluoroethane and other non carbon chlorine organic solvents are used as extractants |
Physical parameters | |
Weight |
12kg |
temperature and humidity |
15-30 ℃ 20% -80% (no condensation) |
Power supply power |
(220 ± 22) V, (50 ± 1) Hz50W |
External dimensions |
480mm (length) x 340mm (width) x 160mm (height) |
Light source system |
The lifespan of the light source can reach over 50000 hours. Adopting German imported infrared tungsten halogen lamps; |
software system |
Adopting dual system analysis to meet the usage of carbon tetrachloride or tetrachloroethylene as extractants respectively; |
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