Surface tension meter is a precision instrument used to measure the surface tension coefficient of liquids, widely used in materials science, coating research and development, ink production and other fields.Domestic surface tensiometers have become commonly used laboratory equipment due to their high cost-effectiveness and easy operation. Mastering its standardized usage method is the key to obtaining accurate data.

　　1、 Preparation before use: Details determine accuracy

1. Instrument inspection and calibration: Before starting up, check whether the sensor, platinum ring (or platinum plate) are intact and whether the connecting circuit is stable. When using for the first time or not using for a long time, calibration must be performed - using standard weights to calibrate the force value of the instrument to ensure that the sensor sensitivity meets the requirements.

2. Sample and environmental preparation: The test liquid should be free of bubbles and suspended solids, and the temperature should be controlled at 20-25 ℃. The laboratory environment should avoid strong airflow or vibration interference.

3. Accessory installation: Choose a platinum ring (suitable for conventional liquids) or platinum plate according to the testing requirements, and gently place it on the top of the lifting rod with tweezers to ensure good contact with the sensor.

　　2、 Standard operating procedure: Four steps to complete precise measurement

1. Sample injection: Pour the liquid to be tested into a dedicated sample dish, with the liquid level covering 2-3mm below the platinum ring/plate to avoid edge effects affecting the results.

2. Instrument initialization: Start the device, set the test mode through the touch screen or buttons, and select automatic or manual measurement mode.

3. Measurement start: Slowly lower the lifting rod to immerse the platinum ring/plate in the liquid to a preset depth (usually 3-5mm), and the instrument displays the surface tension value in real time. When the value is stable, the system automatically records the peak or equilibrium value.

4. Data recording: Repeat the measurement 3 times, take the average as the final result, and record the test temperature at the same time.

　　3、 Attention: Standardize operation to ensure results

1. Platinum ring/plate maintenance: Immediately clean with anhydrous ethanol after use, then rinse with deionized water and blow dry to avoid residual liquid corroding the metal surface; If scratches appear, they should be replaced in a timely manner.

2. Liquid level control: There should be no liquid droplets hanging on the edge of the sample dish, otherwise it will cause the measured value to be higher; When testing high viscosity liquids, it is necessary to extend the equilibrium time (more than 30 seconds).

3. Safe operation: Avoid lowering the lifting rod too quickly to prevent the platinum ring from hitting the bottom of the sample dish and damaging the sensor; If the instrument indicates overload, it is necessary to check whether the viscosity of the sample exceeds the range.

Domestic surface tension meters can stably output reliable data through standardized calibration, standardized measurement processes, and meticulous maintenance. Mastering these operational points can not only improve detection efficiency, but also provide precise technical support for product development and quality control.