ST217A Automatic drug relative density meter

The ST217A automatic drug relative density meter is designed and manufactured based on the third method of oscillating densitometer in the 2020 Chinese Pharmacopoeia 0601 relative density measurement method. The oscillating densitometer mainly consists of (usually made of glass material, used for placing samples), electromagnetic excitation system (making the oscillating tube oscillate), frequency meter (used for measuring oscillation period), and temperature control system

The principle of measuring liquid density with a U-shaped oscillating tube

The oscillation tube method is used to measure the density of substances, which uses electromagnetic waves to induce oscillations in a U-shaped glass tube. The vibration frequency of the substance is related to the density. The actual density of the substance is calculated by comparing the frequency difference between the measured substance and the reference standard substance. The oscillation tube method is used, and the measurement accuracy is high.

Performance characteristics

lConstant temperature control: As liquid density is greatly affected by temperature, it is necessary to convert the liquid density detected at real-time temperature to the liquid density at 20 ℃. This instrument adopts a constant temperature bath control, which seals the sensor, its components, and sample solution inside the constant temperature bath. The temperature of the oscillation tube (sample solution) is detected by the temperature sensor, and the electronic components are controlled by the microcontroller for cooling or heating, ensuring that the temperature inside the constant temperature bath is stable within the range of 20 ℃± 0.1 ℃. This not only solves the troubles and errors caused by conversion, but also ensures the measurement accuracy, stability, and repeatability of the instrument (constant temperature values can be customized according to user requirements)

lDirectly display the density value of the liquid at 20 ℃, with temperature display: detect the oscillation frequency of the sensor through the microcontroller, use the mathematical model of the relationship between sensor frequency and liquid density to calculate the density value of the liquid, and then perform floating-point operation to ensure the accuracy of the measurement results without additional errors caused by insufficient operation bits during the operation process. The density value calculated by the microcontroller is displayed in five digits and has a temperature display window.

lAutomatic sampling: Using a microcontroller to control the stepper motor to drive the peristaltic pump for sample suction, improving the automation level of the product

lAcid and alkali resistant pipelines: The pipelines that come into direct contact with the liquid are all imported acid and alkali resistant pipelines, ensuring that the instrument can measure acid and alkali solutions.

lData storage and transmission: Built in memory chip, capable of storing 80 sets of detection data, and can be recalled and deleted.

lCalibration function: When the instrument is not used for a long time, drift may occur. This instrument can be calibrated using 20 ℃ pure water as the standard, which is a function that glass density meters cannot achieve.

Main technical parameters

lMeasurement range of density: 0.001～1.999g/cm³

lDensity measurement accuracy: ± 0 001g/cm³

lDensity value resolution: ± 0 001g/cm³

lConstant temperature control: 20 ℃± 0.1 ℃

lSampling volume: 2ml/time

lData storage: 80 sets

lEnvironmental temperature requirements: 5 ℃～35 ℃

lPower supply: 220V ± 22V, 50Hz ± 1 Hz, 50W

lExternal dimensions: 206mm × 205mm × 200mm

lInstrument weight: 3.2Kg

lPackaging size: 236 × 235 × 240mm

lWeight: 3.5kg

Packing list

  Shandong Shengtai Instruments Co., Ltd. is specialized in the research and production of experimental testing instruments and industrial testing instruments. It is a professional instrument company integrating instrument research and development, manufacturing, sales and service. Its products are widely used in food, flour, grain and oil, Feed, electricity, petrochemical, industrial oil, aerospace, coal quality and other industries.

For more than 10 years, Shengtai has always been adhering to the "first-class service, customer first" as the purpose, "reasonable price, honesty and trustworthiness" as the business policy. Adhere to technical innovation, with rich knowledge of the technical team and experienced, thoughtful after-sales service team.

Shengtai instrument as one of the most large-scale and competitive enterprises in the industry, with the strength of technology research and development, professional technical knowledge and innovative design concept, in the model improvement, Significant technical breakthrough has been achieved in the development of function expansion and intelligent control system.