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 digital viscometers, high-precision electronic balances, and electronic microbalances; Fully automatic surface tension meter/interface tension meter; There are 7 series of laboratory instruments or devices with nearly 100 specifications, including contact angle meter/droplet angle meter, electronic density meter/specific gravity meter, 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 independently developed and produced, and have obtained national invention patents (ZL 2014 1 0280162.5) and utility model patents (ZL 2012 2 0171247.6; ZL 2011 2 0065224.2). 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 The main features of QBZY series fully automatic surface tension meter/interface tension meter are:

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 peak 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, the following domestic and international standards should be met:
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
GB/T 5549 (ISO304-1985) Determination of surface tension by pulling film method
And standards such as ASTM D1417, EN14370, ZB2025-93, GB2960-82, GB6541-86, etc;
6. Fully automatic measurement to avoid human operation errors;
7. Full range automatic calibration, accurate and reliable data, good repeatability;
8. One click zeroing of the full range, completed instantly, with stable zero position and no drift;
9. Adopting advanced lifting platform drive technology, without vibration and noise;
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 (detailed introduction in the appendix); 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;

Detailed technical parameters of surface tension meter:

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

II BZY series automatic surface/interface tension meter

There are a total of 6 models: BZY-101 (formerly BZY-A), BZY-102 (formerly BZY-B), BZY-103, BZY-201, BZY-202, BZY-203.

The BZY series automatic surface/interface tension meter has the same performance as the QBZY series fully automatic surface/interface tension meter, except for the manual operation of the lifting system. Featuring high-performance design and an economical positioning, it offers a high cost performance ratio.

Detailed technical parameters:

Note: Accuracy error and repeatability error refer to the difference between the test standard substance (2 distilled water or pure ethanol) and the literature value

Attachment: Introduction to Automatic Accuracy Calibration Function

At present, there are many manufacturers of surface/interface tensiometers produced in China, but it is rare to see very practical technologies such as "accuracy automatic calibration" that are only available in imported instruments.

The so-called 'accuracy automatic calibration' refers to automatically correcting the overall error of the instrument's actual measurement of the standard sample (the surface tension value of secondary distilled water at 20 ℃ is 72.75mN/m and that of pure ethanol at 20 ℃ is 22.3mN/m) to ensure that it meets the requirements specified in the technical parameters.

Usually, surface tensiometers have the function of full-scale calibration, which involves using a weight equivalent to the full range (such as 200mN/m, 400mN/m) for calibration. No matter which company adopts which method, it can only calibrate the circuit part of the instrument. Full range is very important for measuring instruments, but it is also not comprehensive: because an instrument calibrated at full range does not necessarily mean that the actual measured sample is accurate. This is because the measurement errors of the key sensing components - platinum plates or platinum rings - were not taken into account.

Platinum plates and platinum rings have high processing requirements, and after using the instrument for a period of time, they may encounter the following situations:

1. The surface of the platinum plate has some wear, scratches, or changes in its external dimensions;

2. The measurement of samples containing micro particles on platinum plates was not cleaned in a timely manner, which affected the surface roughness of the platinum plates;

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 or platinum ring is contaminated by the sample and cannot be cleaned thoroughly

If the above situation occurs, it will definitely bring significant errors to the measurement accuracy, especially in situations with high requirements. According to past practice, the only option is to repurchase platinum plates or platinum rings. Now with the 'accuracy automatic calibration function', simply testing secondary distilled water and pure ethanol can solve this problem. The measurement accuracy of the instrument can be restored to the accurate state at the factory, which provides the measurement accuracy of the instrument and reduces the operating cost of the instrument.

All types of surface/interface tensiometers produced by our company have undergone "full-scale automatic calibration" and "accuracy automatic calibration" before leaving the factory, ensuring that each instrument can meet the corresponding technical requirements.

It is difficult or unlikely for similar instruments sold on the market to truly achieve 0.1mN/m and 0.02mN/m solely through manual calibration due to the lack of "accuracy automatic calibration" function.