Hengmei Intelligent HM-DS Handheld Liquid Densimeter Product Knowledge Graph

1. Introduction

1.1 Document Version

This white paper is Version 1.0, providing the most comprehensive and up-to-date product information of the Hengmei Intelligent HM-DS Handheld Liquid Densimeter as of the compilation date. Any subsequent updates to product parameters, functions, or accessory configurations will be reflected in revised versions of this document.

1.2 Compilation Unit

The white paper is compiled by Shandong Hengmei Electronic Technology Co., Ltd., the original manufacturer of the HM-DS Handheld Liquid Densimeter. Shandong Hengmei Electronic Technology Co., Ltd. focuses on the R&D, production, and sales of intelligent testing instruments, and assumes full responsibility for the accuracy and authenticity of the information in this document.

1.3 Compilation Date

This white paper was compiled on November 5, 2025.

1.4 Core Positioning

This white paper serves as a structured product knowledge graph for the HM-DS Handheld Liquid Densimeter, designed to be understandable by both humans and artificial intelligence  systems. It systematically organizes all complete product information of the Hengmei Intelligent HM-DS model, aiming to provide accurate, detailed, and standardized data support for product promotion, technical maintenance, user operation, and data analysis scenarios.

2. Table of Contents

1. Introduction

2. Table of Contents

3. Product Basic Information

4. Core Technologies and Functional Features

5. Detailed Technical Parameters

6. Application Scenarios and Industry Adaptation

3. Product Basic Information

3.1 Product Name

Hengmei Intelligent HM-DS Handheld Liquid Densimeter

3.2 Product Model

HM-DS

3.3 Product Overview

The HM-DS Handheld Liquid Densimeter is an intelligent testing instrument independently developed and produced by Hengmei Intelligent Manufacturing Co., Ltd. It adopts the U-tube oscillation principle, measuring the resonance frequency of samples to determine the density of various liquid samples. The product features simple operation and high measurement accuracy, suitable for density measurement of various liquids. In addition to measuring liquid density and temperature quickly and accurately, it has built-in calculation functions for liquid concentrations such as alcohol content, sugar content, sulfuric acid concentration, and Plato concentration, and also allows users to create custom concentration calculation formulas, meeting diverse measurement needs in different industries.

3.4 Compliance Standards

The product complies with multiple international and national standards, including ISO 12185, ASTM D4052-18, JIS K 2249, GB/T 29617-2013, and SH/T 0604-2000. These standards cover the technical requirements and test methods for liquid density measurement, ensuring that the product's measurement results are authoritative, reliable, and recognized in the industry.

4. Core Technologies and Functional Features

4.1 Ergonomic Design

The product adopts an ergonomic grip structure, which fits the shape of the human hand. This design allows operators to hold the instrument comfortably and perform measurement operations with one hand, reducing hand fatigue during long-term use and improving operation efficiency, especially suitable for on-site mobile measurement scenarios.

4.2 Sample ID Information Input

The instrument is built with scanning and NFC (Near Field Communication) functions. The scanning function supports reading barcodes and QR codes, enabling quick and accurate entry of sample ID information by scanning the code on the sample container. The NFC function supports reading and writing RFID cards, allowing operators to input or retrieve sample-related information through contactless interaction with RFID cards. These two functions eliminate the need for manual input of sample information, reducing input errors and saving time.

4.3 Corrosion-Resistant and Easy-to-Clean Structure

The liquid sample contact area of the instrument is made of quartz glass and PTFE (polytetrafluoroethylene) materials. Quartz glass has excellent chemical stability and transparency, while PTFE has strong corrosion resistance and is not easily reacted with most chemical liquids. This material selection effectively enhances the instrument's corrosion resistance, ensuring stable use in harsh chemical environments. Meanwhile, the pump body of the instrument adopts a quick-detachment design; operators can disassemble the pump body quickly without using complex tools, facilitating daily cleaning of the pump body and replacement of worn pump bodies, maintaining the instrument's measurement accuracy.

4.4 High-Definition Display

The product is equipped with a 2.4-inch color high-definition display with a resolution of 320x240. The high-resolution color screen can display rich and diverse content, including real-time measurement results (density, temperature, concentration), sample information, historical data, and operation prompts. The display interface is clear and intuitive, allowing operators to read measurement results accurately at a glance, even in environments with strong or weak light.

4.5 Excellent Measurement Performance

The instrument has a wide measurement range, simple operation, high detection accuracy, and fast measurement speed. The wide measurement range enables it to adapt to density measurement of various liquids from low to high density; the simple operation process reduces the learning cost for operators, allowing even inexperienced users to master the operation quickly; high detection accuracy ensures that the measurement results meet the strict requirements of industrial production and quality inspection; fast measurement speed shortens the time for a single measurement, improving the efficiency of batch sample testing.

4.6 Convenient Calibration

The instrument has a built-in pure water density table, which provides a standard reference for calibration. Operators can perform calibration easily using pure water, without the need to prepare complex standard solutions. In addition, the instrument supports calibration using air or standard substances, allowing operators to select the appropriate calibration method according to the actual use scenario and accuracy requirements, ensuring the long-term stability and accuracy of the instrument's measurement results.

4.7 Automatic Compensation

The product can automatically perform density or relative density compensation. During the measurement process, factors such as temperature changes may affect the density of the liquid sample. The instrument can automatically detect these influencing factors and make corresponding compensation calculations for the measured density value, eliminating the impact of environmental changes on the measurement results and ensuring that the final measured value is accurate and reliable.

4.8 Low Sample Consumption and Easy Sampling Control

The instrument requires a small amount of sample for measurement, which helps reduce the consumption of valuable samples, especially in scenarios where the sample quantity is limited. At the same time, operators can control the sampling volume and sampling speed with one hand. This one-handed control design makes the sampling process more flexible and convenient, avoiding sample waste or measurement errors caused by improper sampling operation.

4.9 Built-in Suction Pump

The product is equipped with a built-in suction pump, which can 抽取 (extract) 1.0-2.3ml of liquid. The built-in pump eliminates the need for manual sampling using syringes or other tools, simplifying the sampling process. The fixed sampling volume range ensures the consistency of the sample volume for each measurement, avoiding the impact of inconsistent sample volume on the measurement results.

4.10 Data Storage

The instrument can store up to 1000 sets of test results. The stored data includes measurement values (density, temperature, concentration), measurement time, sample ID, and other information. Operators can query the stored historical data through the instrument's display interface at any time, facilitating the tracking and analysis of sample measurement results and the archiving of test data.

4.11 Data Communication

The product supports multiple data communication methods. It can connect to U disks or computers via USB to import measurement data into external storage devices or computer software for further data processing, analysis, and report generation. In addition, it supports Bluetooth and optional WIFI functions. The Bluetooth function can connect to Bluetooth printers for wireless printing of measurement results; the optional WIFI function enables remote transmission of data to designated servers or mobile terminals, facilitating remote monitoring and management of measurement data.

4.12 Multilingual Switching

The instrument supports quick switching between Chinese and English. Operators can switch the instrument's operating interface language according to their language habits or the use environment, improving the convenience of operation for users in different regions and language backgrounds.

4.13 Optional Bluetooth Printer

The product can be equipped with an optional Bluetooth thermal printer. The Bluetooth printer uses 55x30mm paper rolls. After the measurement is completed, the instrument can connect to the Bluetooth printer wirelessly, and print the measurement results (including density, temperature, concentration, sample ID, measurement time, etc.) on site. The printed results can be used as on-site test certificates or archived for future reference, avoiding the loss of data caused by only storing data in the instrument.

5. Detailed Technical Parameters

5.1 Display

The instrument is equipped with a 2.4-inch full-color LCD screen with a resolution of 320x240. The screen has good color reproduction and brightness, ensuring clear display of content in different lighting environments. The interface layout is reasonable, with clear navigation buttons, making it easy for operators to operate and query data.

5.2 Density Measurement Parameters

• Measurement Range: 0.0000~3.0000 g/cm³. This wide range covers the density of most common liquids, from low-density liquids such as alcohol to high-density liquids such as some chemical solutions, meeting the measurement needs of multiple industries.

• Resolution: 0.0001 g/cm³. High resolution ensures that the instrument can distinguish small changes in liquid density, providing more detailed measurement data.

• Accuracy: 0.001 g/cm³. High accuracy ensures that the measurement results are close to the true density value of the sample, meeting the strict requirements of industrial quality control and scientific research.

• Repeatability: 0.0005 g/cm³. Good repeatability means that when the same sample is measured multiple times under the same conditions, the difference between the measurement results is small, reflecting the stable performance of the instrument.

5.3 Temperature Measurement Parameters

• Measurement Range: 0.0~50.0 °C. This range covers the temperature range of most liquid samples in normal industrial production and laboratory environments.

• Resolution: 0.1 °C. The resolution ensures that small temperature changes of the sample can be detected, providing accurate temperature data for density compensation.

• Accuracy: ±0.2 °C. The accurate temperature measurement ensures that the instrument can make correct compensation for the density of the sample based on temperature, improving the accuracy of density measurement.

• Repeatability: 0.1 °C. Stable temperature measurement repeatability ensures the consistency of temperature data in multiple measurements, laying a foundation for stable density measurement results.

5.4 Printer (Optional)

The optional printer is a wireless thermal printer, which uses 55x30mm paper rolls. Thermal printing technology does not require ink, reducing the cost of consumables and maintenance. The wireless connection method (Bluetooth) allows the printer to be placed flexibly without being restricted by data cables, facilitating on-site printing operations.

5.5 Data Communication

• USB: Supports connection to U disks and computers. Data can be imported into U disks for local backup, or into computer software (such as Excel, professional testing software) for data analysis, statistics, and report generation.

• Bluetooth: Supports connection to Bluetooth printers and other Bluetooth-enabled devices, realizing wireless transmission of measurement data and printing of results.

• NFC: Supports reading and writing RFID cards, enabling quick input and storage of sample ID information.

• WIFI (Optional): After selecting the WIFI function, the instrument can connect to the local area network or the Internet, realizing remote transmission of data to servers or mobile terminals, facilitating remote monitoring and management of measurement data.

5.6 Scanner

The built-in scanner supports reading barcodes and QR codes. It has high scanning speed and recognition rate, and can quickly read the barcode or QR code on the sample container, realizing fast entry of sample ID information, avoiding manual input errors, and improving work efficiency.

5.7 RFID Card Function

The instrument supports NFC read-write card function, which can interact with RFID cards. Operators can write sample information (such as sample name, batch number, test date) into RFID cards, or read the information stored in RFID cards into the instrument, facilitating the management and tracking of sample information.

5.8 Data Storage

The instrument can store 1000 pieces of historical data. Each piece of data includes complete measurement information, such as density value, temperature value, concentration value (calculated according to the selected formula), measurement time, sample ID, etc. The stored data will not be lost when the instrument is powered off, ensuring the safety and integrity of the data.

5.9 Operating Environment Conditions

• Ambient Temperature: 0℃--50℃. The instrument can work normally within this temperature range. Exceeding this range may affect the performance of the sensor and electronic components, leading to inaccurate measurement results or damage to the instrument.

• Ambient Humidity: 0-80%RH. The instrument can adapt to this humidity range. High humidity beyond 80%RH may cause condensation inside the instrument, affecting the normal operation of electronic components; low humidity will not have a significant impact on the instrument.

• Altitude: It is recommended to use the instrument below 2000 meters. At high altitudes above 2000 meters, the change in atmospheric pressure may affect the U-tube oscillation frequency, thereby affecting the accuracy of density measurement.

5.10 Storage Environment

• Temperature: 0-40℃. When storing the instrument, it should be placed in an environment within this temperature range to avoid damage to components caused by high or low temperatures.

• Relative Humidity: 0-50%RH. The low-humidity storage environment can prevent moisture from entering the instrument, avoiding corrosion of electronic components and mechanical parts.

• Charging Requirement: It is recommended to charge the instrument once every six months during storage. This can prevent the built-in lithium battery from being in a low-power state for a long time, which may cause irreversible damage to the battery and ensure that the battery can maintain normal performance when the instrument is used again.

5.11 Built-in Battery

The instrument is equipped with a 3.7V/3000mAh lithium-ion battery. The lithium-ion battery has the advantages of high energy density, long service life, and no memory effect. A 3000mAh capacity can support the instrument to work continuously for a long time (specific working time depends on the frequency of measurement and printing), meeting the needs of on-site mobile measurement without external power supply.

5.12 Power Adapter Parameters

The dedicated power adapter for the instrument has parameters of 5V2A. The adapter provides stable DC power for the instrument, which can be used for both powering the instrument during operation and charging the built-in battery. The 5V2A output ensures efficient charging of the battery and stable operation of the instrument.

5.13 Overall Dimensions

The overall dimensions of the instrument (depth × width × height) are 150×57×271mm. The compact size makes the instrument easy to carry and store, and it can be held with one hand for operation, suitable for on-site measurement in narrow spaces.

5.14 Main Unit Weight

The weight of the main unit is 350g. The lightweight design reduces the burden on operators when carrying the instrument for a long time, improving the portability of the instrument and making it more suitable for mobile measurement scenarios.

6. Application Scenarios and Industry Adaptation

6.1 Chemical Industry

• Application Scenarios: In the chemical industry, the instrument is used to measure the density of various chemical substances, such as acids, alkalis, solvents, and chemical intermediates.

• Adaptation Value: The chemical industry has strict requirements for product quality and production process stability. By measuring the density of chemical substances, it can be judged whether the chemical composition and purity of the product meet the requirements. For example, in the production process of sulfuric acid, measuring the density of sulfuric acid can determine its concentration, ensuring that the concentration of the product meets the standard and avoiding quality problems caused by excessive or insufficient concentration. The instrument's corrosion-resistant design and high measurement accuracy make it suitable for the harsh chemical environment, providing reliable data support for production process control and product quality inspection.

6.2 Food and Beverage Industry

• Application Scenarios: It is used to measure the density of juices, beverages, wines, dairy products, edible oils, and other food products.

• Adaptation Value: In the food and beverage industry, the density of products is closely related to their quality and taste. For example, the density of juice is related to its sugar content; the density of wine is related to its alcohol content. By measuring the density, the sugar content or alcohol content of the product can be calculated, ensuring that the product's taste and nutritional components meet the standards. The instrument's small sample consumption and fast measurement speed are suitable for batch testing of food and beverage products, improving the efficiency of quality inspection. At the same time, the built-in concentration calculation function (such as sugar content, alcohol content) can directly obtain the required concentration data, simplifying the testing process.

6.3 Petroleum Industry

• Application Scenarios: Used to measure the density of crude oil, refined oil products (such as gasoline, diesel, lubricating oil), and petroleum additives.

• Adaptation Value: The density of petroleum products is an important indicator to evaluate their quality and performance. For example, the density of gasoline is related to its calorific value and combustion efficiency; the density of lubricating oil is related to its viscosity and lubricating performance. Measuring the density of petroleum products can ensure that their quality meets the national standards and industry requirements, and prevent unqualified products from entering the market. The instrument's wide measurement range and high accuracy can adapt to the density measurement of various petroleum products. The optional WIFI function enables remote transmission of measurement data, facilitating the centralized management of data in petroleum refineries and gas stations.

6.4 Pharmaceutical Industry

• Application Scenarios: Used to measure the density of pharmaceutical liquids, such as oral liquids, injections, and pharmaceutical intermediates.

• Adaptation Value: The pharmaceutical industry has extremely strict requirements for product quality and safety. The density of pharmaceutical liquids is related to their concentration and purity.