Pharmaceutical Testing Instruments Automatic Drug Relative Density Meter Relative Density Method

      ST217A automatic drug relative density meter is designed and manufactured based on the third method of oscillation type density meter in the 2020 Chinese Pharmacopoeia 0601 relative density measurement method. The oscillation type density meter mainly consists of a U-shaped oscillation tube (usually made of glass material, used to place samples), an electromagnetic excitation system (to make the oscillation tube oscillate), a frequency meter (used to determine the oscillation period), and a temperature control

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

● Constant temperature control: 20 ℃± 0.1 ℃

● Result display: Directly 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.

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

Acid 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.

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

Calibration 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

●Measurement range of density: 0.001~1.999g/cm3

●Density measurement accuracy: ± 0 001g/cm3

●Density value resolution: ± 0 001g/cm3

●Constant temperature control: 20 ℃± 0.1 ℃ (can be customized for any temperature between 15~35 ℃)

●Sampling volume: 2ml/time

●Data storage: 80 sets

●Environmental temperature requirements: 5 ℃~35 ℃

●Power supply: 220V ± 22V, 50Hz ± 1 Hz, 50W

●External dimensions: 206mm x 205mm x 200mm

●Instrument weight: 3.2Kg

●Packaging size: 236 * 235 * 240mm

●Weight: 3.5kg

Packing list

Shandong Shengtai Instrument Co., Ltd. provides the following quality assurance for the instruments sold to you:

----The provided instrument materials are brand new, comply with national quality standards, and have the manufacturer's certificate of conformity;

----The materials and main components provided meet the technical requirements specified in the technical documentation;

----The warranty period for the entire equipment is one year (excluding normal wear and tear of vulnerable parts).

----We are responsible for free maintenance of any instrument quality issues that occur during the warranty period. Due to the user's responsibility for causing equipment malfunction, we are responsible for maintenance and reasonable charges.

----Lifetime discounted supply of components for equipment, and lifelong maintenance and repair of the entire machine.

----After the expiration of the warranty period, if the user needs maintenance and technical services, we will only charge a cost fee.