1. Standard Compliance and Positioning
The DFYF-193 Apparent Viscosity Tester (Cold Cranking Simulator, CCS) is designed and manufactured in accordance with GB/T 6538 and ASTM D5293. It accurately measures the low-temperature dynamic viscosity of engine oils – a critical parameter that directly reflects cold-start performance. This instrument is essential for engine oil formulation development, quality control, and third-party testing.
Compliance with both the Chinese national standard and the internationally recognised ASTM standard ensures that test results are mutually accepted across domestic and global lubricant markets, providing reliable data support for lubricant manufacturers, research institutions, and quality inspection centres.
2. High-Performance Hardware – Reliability and Longevity
2.1 Imported Compressor Refrigeration System
The refrigeration unit utilises an imported compressor combined with coverage refrigeration technology to achieve rapid cooling. Compared with conventional refrigeration systems, it offers the following advantages:
Fast cooling: significantly reduces the time required to cool from ambient temperature to -40 °C, improving testing efficiency.
High temperature stability: bath temperature control accuracy of ±0.1 °C, providing a robust low-temperature environment.
Long service life: the imported compressor maintains a low failure rate even under continuous high-load operation, reducing maintenance costs.
2.2 Imported Drive Motor
The instrument employs an imported motor to drive the rotor to rotate stably in high-viscosity oil samples at low temperatures. Its features include:
Strong torque: maintains precise rotational speed even under extreme conditions of -40 °C and viscosities up to 27,000 mPa·s.
High speed accuracy: provides the physical foundation for accurate viscosity calculation.
3. Fully Automated Workflow – From Sample Loading to Cleaning
Traditional CCS instruments involve cumbersome manual operations and place high demands on operators. The DFYF-193, controlled by a PC with a Windows operating system, automates the entire process, significantly reducing human error.
Step | Automation Feature | Benefit |
Loading | Automatic sample injection after temperature setting | Eliminates manual injection, avoiding bubbles and volume errors |
Measurement | Real time speed detection during the 60 second rotation | Dynamic monitoring ensures consistency of test conditions |
Calculation & Storage | Automatic viscosity calculation and data saving upon test completion | Prevents manual calculation errors and facilitates audit trails |
Temperature recovery | Rapid rotor warm up after test completion | Allows the next test to be started immediately, improving continuous testing efficiency |
Cleaning | Internal waste bottle with automatic cleaning after test | No disassembly required; protects operator safety and extends stator life |
The above automation design enables even novice operators to become productive quickly, while freeing experienced personnel from repetitive tasks. It is particularly suitable for high throughput quality inspection centres.
4. Data Accuracy Assurance – Calibration with 12 Imported Cannon Standard Oils
The core value of a viscosity tester lies in accurate measurement and good repeatability. Each DFYF-193 unit is factory calibrated using 12 imported Cannon certified reference oils, covering the full viscosity range of 1500–27,000 mPa·s.
Multi point calibration: rather than a single point or two point adjustment, this ensures a linear response across the entire measurement range.
International traceability: Cannon standard oils are a globally recognised benchmark for viscosity testing, ensuring that instrument data are comparable to those of high end imported models.
Verified performance: after calibration, the instrument achieves repeatability ≤2.6% and reproducibility ≤7.3%, strictly meeting the requirements of GB/T 6538 and ASTM D5293.
Furthermore, the stator temperature control accuracy reaches 0.02 °C, far exceeding the standard requirement (typically 0.1 °C). This is a key technical foundation for achieving excellent repeatability.
5. Summary – Why Choose the DFYF-193?
Aspect | Advantage |
Standards | GB/T 6538 & ASTM D5293 – recognised both domestically and internationally |
Temperature control | Stator: 0.02 °C / Bath: 0.1 °C – industry leading |
Refrigeration system | Imported compressor + coverage cooling – fast cooling and long life |
Drive system | Imported motor – excellent low temperature performance |
Automation | Fully automatic loading, measurement, calculation, temperature recovery, and cleaning |
Calibration | 12 Cannon standard oils – data comparable to imported instruments |
Repeatability / Reproducibility | ≤2.6% / ≤7.3% – meets and exceeds standard requirements |
For lubricant manufacturers, third party testing laboratories, and engine oil R&D laboratories, the DFYF-193 represents a high accuracy, highly automated, and cost effective CCS viscometer. It successfully resolves the common pain points of older instruments – inaccurate data, complicated operation, and slow cooling – making it an ideal choice for replacing expensive imported models.