– Dual-Module Design, Fast Cooling, Precise Temperature Control for LPG Density Testing
In the quality control and commercial transaction of liquefied petroleum gas (LPG), density is a key parameter for calculating product mass, volume, and energy conversion. The DFYF-803 LPG Density Tester is designed and manufactured in strict accordance with the SH/T 0221 standard. It consists of two main parts: a testing unit and a refrigeration circulation unit. It is suitable for density determination of LPG and similar volatile petroleum products – making it an ideal choice for refineries, gas filling stations, quality inspection centers, and third-party laboratories.
1. Standard Compliance and Applicable Samples
The DFYF-803 complies with the following standard:
SH/T 0221 (Test method for density of liquefied petroleum gas)
Applicable sample types:
Liquefied petroleum gas (LPG)
Propane, butane, and mixed liquefied gases
Other volatile petroleum products requiring density testing
Density measurement results are widely used for product quality assessment, loading metering, commercial transfer, and storage and transportation management.
2. Key Technical Specifications
Parameter | Specification |
Power Supply | AC220V, 50Hz |
Input Power | 1000W |
Temperature Range | 5 ~ 40°C |
Temperature Accuracy | ±0.1°C |
3. Performance Features
3.1 Compliant with SH/T 0221 Standard
The instrument is fully designed according to the SH/T 0221 standard – test conditions, operating procedures, and result calculations all meet the specifications, ensuring authoritative and comparable test results.
3.2 Dual-Module Structure – Clear Functionality
The instrument consists of two main parts:
Testing unit: Includes thermometer, heater, bath, temperature control circuit, pressure hydrometer cylinder, etc.
Refrigeration circulation unit: Independent circulating refrigeration to ensure low-temperature test conditions
The two parts work together, offering a clear structure that is easy to maintain and manage.
3.3 Imported Compressor + Internationally Advanced Refrigeration Technology
The refrigeration circulation unit features:
Imported compressor
Internationally advanced refrigeration technology
Advantages:
Simple operation
Easy to use
Fast cooling rate
It can quickly reach and stabilize at the required low-temperature set point (as low as 5°C).
3.4 Bath Temperature Control via Thermal Balance Method
The bath temperature control of the testing unit is achieved through a thermal balance method, offering:
Fast response speed
High temperature control accuracy (±0.1°C)
This ensures stable and consistent bath temperature throughout the test, resulting in accurate and reliable density measurements.
3.5 Equipped with Pressure Hydrometer Cylinder
The instrument is equipped with a dedicated pressure hydrometer cylinder, allowing density measurement of LPG under pressure. This complies with the SH/T 0221 requirement for closed-system measurement and prevents light component evaporation from affecting density results.
4. Significance of Density Testing
Application Scenario | Role of Density Measurement |
Quality control | Determines whether LPG purity and composition meet standards |
Commercial transaction | Volume-to-mass conversion for fair trade |
Storage and transportation management | Tank inventory calculation, loading metering |
Energy conversion | Combined with density to calculate heating value for gas pricing |
Accurate density measurement provides reliable data support for LPG production, sales, and use.
5. Comparison with Traditional Density Testers
Feature | Traditional Basic Density Tester | DFYF-803 Professional Model |
Structure | Single bath, no independent refrigeration | Testing unit + refrigeration circulation unit – dual module |
Refrigeration method | Peltier cooling or ordinary compressor | Imported compressor + internationally advanced refrigeration technology |
Cooling rate | Slow | Fast |
Temperature control method | Manual or basic control | Thermal balance method – fast response, high accuracy |
Temperature accuracy | Typically ±0.5°C or lower | ±0.1°C high accuracy |
Pressure measurement | Atmospheric or basic sealing | Pressure hydrometer cylinder – pressurized measurement |
Standard compliance | Partial | Fully compliant with SH/T 0221 |
6. Typical Applications
Refinery quality control laboratories – Density testing of LPG before product dispatch
LPG filling stations – Loading metering and inventory verification
Quality inspection centers – LPG quality supervision and inspection
Third-party testing agencies – Standard density analysis of batch samples
Gas utilities – LPG heating value calculation and commercial transfer
7. Service and Support
We provide full technical support – from installation and commissioning to operator training and after-sales maintenance. The DFYF-803, with its dual-module design, fast cooling, and high-precision temperature control, is a reliable tool for your LPG density testing needs.
About Us
With nearly 40 years of specialized experience, Dalian Analysis Instrument Factory is a leading manufacturer of petroleum product testing instruments. We are ISO 9001 (2000) certified, ensuring reliable quality assurance in design, production, and after-sales service.
Our product line covers more than 100 varieties, including analyzers for gasoline, kerosene, diesel, lubricating oils, greases, and general laboratory equipment.
Contact Us
For standard models or customized solutions – we are here to help you improve your LPG density testing capabilities.
Sales Email: [lovecarlos2000@gmail.com]
24-Hour Hotline: +86 15941156556
