The DFYF-147 Petroleum Cold Filter Point Tester is a specialized low-temperature measuring instrument designed for the accurate determination of cold filter plugging point (CFPP), cloud point, and pour point of petroleum and petroleum products. It is manufactured in strict compliance with GB/T 510 (Petroleum Products – Determination of Pour Point), GB/T 3535 (Petroleum Products – Determination of Pour Point), and GB/T 6986-83 (Petroleum Products – Determination of Cloud Point).
Unlike conventional low-temperature testers that struggle to maintain stability at extreme temperatures, the DFYF-147 achieves reliable operation down to -70°C through an advanced cascade refrigeration system, making it suitable for diesel fuel quality control, aviation fuel testing, and lubricant R&D laboratories.
To achieve the low test temperatures required by GB/T 6986-83, the DFYF-147 employs a cascade refrigeration method utilizing two separate refrigerants and a closed circulation system. This design maintains appropriate evaporation pressure even at very low evaporation temperatures.
How it works: The two refrigerants condense within a shared evaporative condenser, which is fully isolated from the external environment by high-density insulating materials. This configuration generates the extremely low evaporation temperatures needed for cold filter point testing. When the bath temperature falls below the set point, the digital temperature controller automatically outputs a signal that drives a precision heater through a solid-state relay, achieving stable constant temperature control.
Compressor: The system uses a genuine SECOP compressor (imported, Denmark-designed), known for rapid cooling speed and extended service life – verified through 2,000+ hours of continuous runtime testing.
The DFYF-147 functions as a multifunctional low-temperature measuring instrument, integrating four independent systems:
| System | Components | Function |
|---|---|---|
| Refrigeration System | High-temperature unit, low-temperature unit, temperature relay, filter, immersed cold head | Generates and maintains low temperatures |
| Control System | Stirrer, digital temperature controller, heater, PT100 sensor, cold bath, temperature control circuit | Maintains bath temperature via thermal balance method (fast response, high accuracy) |
| Measurement System | Test tubes, test bottle sets, tilting stands, automatic timer, audible alarm | Enables 45° tilt testing with timing accuracy |
| Suction Filtration System | Side-mounted suction filter device (included) | Performs cold filter point determination per GB/T 6986-83 |
The measurement system includes a test bottle cover that can be tilted at exactly 45 degrees according to test requirements. An automatic timer tracks the test duration and triggers an audible alarm upon completion – significantly reducing experimental errors and improving repeatability compared to manual timing methods.
| Parameter | Value |
|---|---|
| Voltage | AC 220V ±10%, 50Hz |
| Input Power | 1400W |
| Temperature Range | Ambient to -70°C |
| Temperature Control Accuracy | ±0.1°C |
| Display Resolution | ±0.1°C |
| Hole Configuration | 4 slots / 8 holes (2 slots / 4 holes available on request) |
| Refrigeration Type | Cascade (two refrigerants, common evaporative condenser) |
| Compressor Brand | SECOP (imported) |
| Special Requirement | Side-mounted suction filter device (included) |
Fully compliant with GB/T 510 (pour point), GB/T 3535 (pour point), and GB/T 6986-83 (cloud point/cold filter point)
Factory calibration traceable to national standards
Optional CE certification available upon request
Dual-refrigerant cascade design – achieves -70°C without compressor overload
Insulated evaporative condenser – minimizes heat loss, improves energy efficiency
Automatic 45° tilt with alarm – eliminates operator timing errors
Side-mounted suction filtration – no external vacuum pump required
| Feature | Conventional Tester | DFYF-147 |
|---|---|---|
| Compressor | Unbranded/unknown origin | SECOP (Denmark) |
| Refrigeration | Single-stage (limited to -40°C) | True cascade (down to -70°C) |
| Temperature uniformity | ±0.5°C or worse | ±0.1°C |
| Suction filter | External add-on (extra cost) | Integrated side-mounted (included) |
| Timer | Manual stopwatch | Automatic with alarm |
Founded: Early 1980s (nearly 40 years of experience)
Production capacity: Complete sets of manufacturing and testing equipment
Technical team: Strong engineering force specializing in petroleum analysis
Product portfolio: Over 100 varieties and specifications – one of China’s widest ranges
Global reach: Petroleum Freezing Point Testers sold successfully in domestic and international markets
Diesel fuel quality control: Cold filter plugging point (CFPP) testing for winter-grade diesel
Aviation fuel: Jet fuel freezing point determination
Lubricants: Low-temperature flow property evaluation for hydraulic oils and gear oils
Petroleum laboratories: Refinery QC, third-party testing facilities, research institutes
Cascade refrigeration pairs two independent refrigeration circuits:
High-stage circuit: Uses a refrigerant with moderate boiling point to absorb heat from the low-stage condenser
Low-stage circuit: Uses a low-boiling-point refrigerant (e.g., R23) to achieve -70°C at the cold head
The two circuits share a common evaporative condenser, which improves heat exchange efficiency by approximately 40% compared to non-integrated designs. This technical approach is widely recognized in cryogenic engineering as the most reliable method for achieving -50°C to -80°C without liquid nitrogen.
Each SECOP compressor undergoes 48-hour burn-in testing before assembly
Every completed unit is tested with a certified reference oil sample at -50°C to verify accuracy
Temperature controllers are three-point calibrated (-40°C, -60°C, -70°C) using NIST-traceable standards
Refrigeration systems are pressure-tested to 2.5 MPa to ensure leak-free operation
Uses non-ODS refrigerants (zero ozone depletion potential)
Steel housing is recyclable (＞85% recovery rate)
Provides free technical training materials to petroleum institutes and vocational schools
Pre-sale: Free sample testing service – customers can send oil samples for CFPP verification before purchasing
Training: Operator training documentation and video guides included
Maintenance: Preventive maintenance schedule and spare parts list provided
Warranty: 2 years on entire instrument, 3 years on SECOP compressor
Technical support: 24-hour phone/email support, 72-hour on-site service (in major regions)
Choosing the right supplier for petroleum cold filter point testers requires confidence in both product quality and long-term support. Here is why customers repeatedly choose us:
Deep industry expertise – Nearly four decades of focused experience in petroleum analytical instrumentation
Comprehensive support – Training, maintenance, and technical support available throughout the product lifecycle
Proven solutions – Our petroleum cloud point testers are used by major refineries and testing laboratories worldwide
Continuous innovation – We introduce unique technologies and methods to provide more efficient and accurate petroleum analysis solutions
