Company Profile:
　　
Shanghai Fangrui Instrument Co., Ltd. is a manufacturer of measuring instruments (with a license for manufacturing measuring instruments such as electronic scales and moisture meters).
　　
The main products produced by the company include high-precision electronic balances and electronic microbalances; Fully automatic surface tension meter/interface tension meter; Contact angle meter/droplet angle meter, electronic density meter/specific gravity meter; Seven series of laboratory instruments or devices with nearly a hundred specifications, including digital rotational viscometer, constant temperature water bath (oil bath)/low-temperature constant temperature bath/ultra-low temperature constant temperature bath, particle analyzer (settling balance), etc.
　　
All kinds of instruments or devices produced by our company are self-developed and have obtained national invention patents (ZL.5) and utility model patents (ZL.6; ZL.2). Having independent intellectual property rights ensures that users can use it with peace of mind in the long term. All instruments produced can be sent for third-party verification by Shanghai Institute of Metrology and Testing Technology, with a one-year warranty and lifetime service.
　　
　　
　　
One Main features of automatic surface tension meter BZY-101 (BZY-A):
　　
1. Use both platinum plate and platinum ring testing methods;
　　
When testing platinum plates, the displayed value is the surface tension value;
　　
When using the platinum ring testing method, the displayed value automatically locks the maximum force value of the sample, and then the surface/interface tension value is calculated using the provided calculation software or automatically calculated by the computer using data processing software;
　　
4. Platinum ring size: wire radius of 0.185mm, ring radius of 9.55mm, ring circumference of 60mm;
　　
When using the platinum ring testing method, it fully complies with the following domestic and international standards:
　　
GB/T 22237-2008 Surface active agents Determination of surface tension
　　
JB/T 9388-2002 Technical Conditions for Interface Tension Tester
　　
JB/T 18396-2001 Natural Latex Determination of Surface Tension by Ring Method
　　
SH/T 1156-95 Synthetic Latex Surface Tension Determination Method
　　
GB/T 6541-86 Petroleum products Determination of interfacial tension between oil and water (ring method)
　　
ISO 1409:1995 Determination of surface tension of plastics, rubber, polymer dispersions and latex
　　
ISO 6295-1983 Petroleum products - Determination of interfacial tension between mineral oils and water (ring method)
　　
GB/T 5549 (ISO304-1985) Determination of surface tension by pulling film method
　　
and ISO14090-82, ASTM D1417, EN14370, ZB2025-93, GB2960-82, GB6541-86 and other standards;
　　
6. Fully automatic measurement to avoid human operation errors;
　　
7. Full range automatic calibration, accurate and reliable data, excellent repeatability;
　　
8. One click zeroing of the full range, completed instantly, with stable zero position and no drift;
　　
9. Manual lifting and automatic measurement;
　　
10. The instrument has a reasonable structure, works independently, does not require any additional equipment (such as an external computer, etc.), and can also be optionally equipped with a computer for data processing;
　　
11. When using platinum plates, the surface tension or interfacial tension of liquids can be measured in real time. It is very practical for measuring samples containing surfactants or volatile substances whose surface tension changes over time (using data processing software can display the test curve in real time and obtain detailed information on tension changes);
　　
When using a platinum plate for testing, it can automatically measure the surface tension of medium and high viscosity liquid samples;
　　
Both testing methods can measure the interfacial tension between immiscible liquids, such as the oil/water interface;
　　
14. Data processing software (optional): It can automatically collect test data, display test curves in real time, and the curves can be automatically enlarged, accessed, and printed. Capable of comparing multiple curves, converting raw data into Excel files, and automatically calculating surface tension values when using platinum ring testing methods;
　　
15. Unique accuracy calibration function (optional): Using twice distilled water and pure ethanol as standards, the overall testing error of the instrument is automatically calibrated to ensure that the instrument is in the accurate state at the time of leaving the factory for a long time;
　　
16. Unique temperature automatic compensation function (optional): Using twice distilled water and pure ethanol as standards, automatically summarize the test values of samples at different temperatures to 20 ℃;
　　
17. Comes with multiple temperature control options to meet different testing requirements;
　　
18. Meet the special requirements of users and undertake non-standard products.

II Main technical parameters of automatic surface tension meter BZY-101 (BZY-A):

Note: Accuracy error and repeatability error refer to the difference between the measured standard samples (secondary distilled water and pure ethanol) and the literature values

Reference price for surface tension meter transaction:

BZY-101: 8900.00

BZY-102: 8900.00

BZY-201: 9900.00

BZY-202: 9900.00

Attachment 1: QBZY Series Fully Automatic Surface Tensioner/Interface Tensioner
　　

QBZY series fully automatic surface/interface tension meter detailed technical parameters:

Note: Accuracy error and repeatability error refer to the difference between the measured standard samples (secondary distilled water and pure ethanol) and the literature values

Attachment 2: Introduction to Accuracy Automatic Calibration and Temperature Automatic Compensation Functions:
　　
At present, there are many manufacturers in China that produce surface/interface tension meters, and the models are diverse. However, except for the full series of surface/interface tension meters produced by Shanghai Fangrui Instrument Co., Ltd., almost none of them have advanced technologies such as "accuracy automatic calibration" and "temperature automatic compensation" that are only available in imported instruments and are very practical.
　　
The so-called "accuracy automatic calibration" refers to the automatic correction of the overall error of the instrument testing standard sample, using secondary distilled water (72.75mN/m at 20 ℃) and pure ethanol (22.3mN/m at 20 ℃) as standard samples. After accuracy automatic calibration, the measurement accuracy and repeatability of the whole machine can fully achieve:
　　
≤±0.1mN(BZY-1)
　　
≤±0.02 mN(BZY-2)
　　
Domestic surface/interface tensiometers of the same type sold on the market generally have full-scale calibration, which is carried out using a weight equivalent to the maximum range (such as 200mN/m, 400mN/m). Regardless of the method used, only the sensor and circuit parts of the instrument can be calibrated. Full range calibration is necessary for measuring instruments, but it is also not comprehensive: an instrument that has been fully calibrated does not necessarily mean that the actual measured sample is accurate, because full range calibration does not take into account the measurement errors of key sensing components - platinum plates or platinum rings. Platinum plates and platinum rings have strict size and price requirements: Platinum plates require flatness, a certain degree of roughness on the surface, and sufficient wetting with liquids; Platinum rings require strict adherence to standards for wire thickness and diameter, as well as a standard circle.
　　
After using the instrument for a period of time, one may encounter the following situations:
　　
1. The surface of the platinum plate has worn, scratched, or slightly changed in external dimensions
　　
2. Platinum plate measurement contains particulate samples, which affect surface roughness
　　
3. The platinum ring is deformed, no matter how it is shaped, it is not round or the bottom is uneven
　　
4. The platinum plate and platinum ring are contaminated by the sample and cannot be cleaned by any method
　　
If the above situation occurs, it will definitely bring significant errors to the measurement accuracy, especially in situations with high requirements, which will have a greater impact. To solve this problem, according to past practices, one can only purchase platinum plates or platinum rings again. Now with the "accuracy automatic calibration function", this problem can be completely solved by testing secondary distilled water and pure ethanol, restoring the measurement accuracy of the instrument to the precise state at the factory, which not only improves the measurement accuracy of the instrument, but also reduces the operating cost of the instrument.
　　
It is difficult for similar surface/interface tensiometers sold on the market to achieve technical parameters of 0.1mN/m and 0.02mN/m due to the lack of "accuracy automatic calibration" function.