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The foam property tester is primarily used to measure the foam properties of lubricants, in order to prevent mechanical failures. The core unit is equipped with a 100MHz high-speed single-chip microcomputer, and it incorporates on-board components such as a display drive module, keyboard scanning module, high-precision clock module, RS-232 serial communication module, NVM data storage module, output control module, and buzzer alarm module, offering comprehensive functionality. The foam property tester consists of high and low temperature baths, a heating device, a temperature control device, an air supply device, a sample container, etc. The high and low temperature bathtubs have digital temperature control panels that regulate the bath temperature; these panels provide accurate temperature control and an intuitive display. Easy to operate. When the bath temperature is below the value set by the thermostat, it activates the heating device through a solid-state relay; when the bath temperature is above that set value, the thermostat stops the heating device from operating, and the stirring mechanism is then used to maintain a constant and even temperature in the bath. A air pump or nitrogen cylinder is used to introduce gas into the flow meter, gas diffusion head, and the volumetric flask containing the sample at regular intervals and in fixed quantities, thereby allowing the volume of bubbles generated by the sample to be determined. The entire machine features a compact structure, an attractive design, and easy operation. Usage for testing with a foam property tester: 1. First, fill the high- and low-temperature glass baths with water up to 7 cm below the lid. 2. Connect the gas pipeline according to the requirements of the GB/T test methods for the foam property tester, and check other preparatory work for the test. 3. Once everything is ready, turn on the “Power” switch, as well as the “Low Temperature Control” switch and the “High Temperature Control” switch ； At this time, the indicator lights of each switch turn on. Set to 24°C (low-temperature bath) and 93.5°C (high-temperature bath) as required. Once the settings are made, the display on the panel shows the actual temperatures within each bath. The two baths begin to heat up, and when the actual temperatures reach the set values, the automatic control system maintains these temperatures constant within the baths. 4. The foam property tester starts the timer at the appropriate time in accordance with the method requirements, enabling a timed automatic alarm function. 5. When the indoor temperature exceeds 24°C, the cold head of the immersion-type refrigerator should be placed in a low-temperature bath; by turning on the refrigerator’s switch, the compressor starts to operate, and the temperature of the low-temperature bath can be automatically maintained at 24°C ± 0.5°C (if there is no immersion-type refrigerator, cooling water can be used to keep the bath temperature at 24°C ± 0.5°C).