Surface tension meter

JYW-200C 型Surface tension meterIntroduction

1、 Product Usage

JYW-200CSurface tension meterIt is a testing instrument used to measure the interfacial tension between liquids and gases or between liquids. This instrument can quickly and accurately measure the surface and interfacial tension values of various liquids, and automatically display the results. Used in the water and electricity department to test the interfacial tension value of electrical oil, in order to strengthen the supervision of insulation oil quality. In departments such as petroleum, chemical, and scientific research, surface and interfacial tension values of various liquids can be tested to enhance the analysis of various liquids. This type of instrument has specially increased the coefficient factor of fire extinguishing agent materials, making it particularly suitable for product inspection in fire equipment manufacturers.

This instrument meets the standards:

GBT5549-2010 "Surface active agents - Determination of surface tension by pulling up liquid film method"

GBT18396-2008 "Determination of Surface Tension of Natural Latex by Ring Method"

GB11278-1989 "Determination of Critical Micellar Concentration of Cationic and Non Ionic Surfactants - Circular Ring Determination of Surface Tension Method"

JBT9388-2015 "Technical Conditions for Interface Tension Meter"

ISO 304-1985 "Surface active agents - Determination of surface tension by pull-out liquid film method"

2、 Technical parameters

1Measurement range: 0-200.00mN/m

2Resolution: 0.01mN/m

3The relative error of the indication is not greater than ± 1%

4The repeatability error of the indication is not greater than 0.5%

5Zero drift: ≤ 0.2mN/m

6Lifting stroke: 25mm

7Lifting speed: 15mm/min ± 2 mm/min

8Sample cup inner diameter: 56mm

9Sample cup capacity: 60mL

10Platinum wire radius: 0.3mm

11Platinum ring circumference: 60mm

12Dimensions: 400 × 220 × 350mm

13Environmental temperature: Room temperature 10 ℃ -35 ℃

14Power supply: 220V/50Hz ± 5%

15Net weight: 10kg

3、 Instrument functions

1Has peak holding function

2Equipped with automatic stop function for rising and falling (automatic stop for liquid film rupture)

3Equipped with automatic zero adjustment function;

4Equipped with automatic parking warning function;

5Automatically calculate the actual tension values on the liquid surface and interface, as well as the average of multiple test tension values;

6Sound type buttons, easy to operate;

7Reserved printer interface (equipped with a printer to print test reports).

4、 Structure and principle

The structure of the instrument mainly consists of a torsion wire, a differential transformer, a platinum ring, and a lifting part. During the experiment, the platinum ring is immersed in a certain position (3-5 mm) of the tested liquid, and the glass container containing the tested liquid is lowered by a motor. At this point, the membrane between the platinum ring and the measured liquid is stretched, causing a downward pulling force on the platinum ring. By using a lever arm to twist the torque wire, the magnetic core of the differential transformer rises as the platinum ring descends. Induce a certain voltage value in the coil of the differential transformer. The deformation of the stretched film is converted into a voltage value, which is processed by a microcomputer and converted into the corresponding tension value, and automatically displayed. As the film is gradually stretched, the tension value gradually increases until the film breaks. The maximum value is the measured tension value P of the liquid, which is automatically multiplied by the correction factor V of the liquid to obtain the actual tension value F of the liquid, that is, F=P * V. The correction factor V depends on the measured value, liquid density, radius of platinum wire, and radius of platinum ring.

Due to the implementation of microcomputer control, the anti-interference capability of the instrument has been increased in both software programming and hardware design. When zeroing, electric zeroing is used, which allows the magnetic core of the differential transformer to be zeroed as long as it is in a stable state within the zeroing range, making it very convenient and reliable to use. The zero adjustment range is 0.0010.00mN/m.