1. Constant temperature control: Since the liquid density is greatly affected by temperature, the liquid density detected at the real-time temperature is converted into the liquid density at 20 °C. The instrument adopts the constant temperature bath control, and the sensor and its components and sample liquid are sealed in the constant temperature bath. The temperature of the oscillating tube (sample liquid) is detected by the temperature sensor, and the electronic component is controlled by the single chip to cool or heat the electronic component to ensure the inside of the constant temperature bath. The temperature is stable within the range of 20 ° C ± 0.1 ° C. This not only solves the troubles and errors caused by the conversion, but also ensures the measurement accuracy, stability and repeatability of the instrument (the constant temperature value can be customized according to user requirements). The instrument adopts double bile constant temperature, which has better sealing performance and stronger stability. 2. Directly display the density value of the liquid at 20 ° C, and display by temperature: the oscillation frequency of the sensor is detected by a single-chip microcomputer, and the density value of the liquid is obtained by using a mathematical model of the relationship between the sensor frequency and the liquid density, and then floating point operation is performed. In the operation process, there is no additional error caused by insufficient operation digits, and the accuracy of the measurement result is guaranteed. The density value calculated by the MCU is displayed by a five-digit number and has a temperature display window. 3. Automatic sampling: using single-chip microcomputer to control the stepping motor to drive the peristaltic pump to absorb the sample, improve the automation degree of the product. 4. Free wall treatment: the liquid will leave residual liquid on the inner wall of the oscillation tube during the flow process, which will affect the measurement. Accuracy, so the wall of the inner wall of the oscillating tube can be prevented from leaving liquid on the inner wall of the oscillating tube, which ensures the accuracy of the instrument. 5. Acid and alkali resistant pipeline: The pipelines that are in direct contact with the liquid are imported acid and alkali resistant pipes to ensure that the instrument can measure the acid and alkali solution. 6. Data storage: Built-in memory chip, can store 80 sets of test data, and can be recalled and deleted. 7. Auxiliary function: It can directly read the liquid density at 20 °C, and can also read the alcohol content of the alcohol solution at 20 °C through the conversion button. It is also possible to perform special physical quantities (such as sulfuric acid concentration, etc.) measurement with special software according to user needs. 8. Calibration function: When the instrument is not used for a long time, it will drift. This instrument can calibrate the instrument with 20°C pure water as the standard, which is not realized by the glass density meter.
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