Specifically designed for degassing and water-soluble acid determination in transformer oil chromatography, addressing experimental challenges and avoiding common operational errors.
In the field of insulation oil testing for power systems, constant-temperature oscillatory degassing of samples is a critical step that determines the accuracy of gas chromatographic analysis and water-soluble acid determination results. Addressing the drawbacks of traditional manual oscillation methods—including cumbersome operation, unstable temperature control, and sample leakage—we have introduced a fully automated multifunctional degassing oscillator that strictly complies with GB/T 17623-1998 and DL429.4-91 standards. Featuring a 5-inch color touchscreen, PID intelligent temperature control, and a high-performance motor drive system, this device provides users with a standardized "one-click" oscillation solution.
This instrument features a dual-layer structure (upper and lower layers) capable of accommodating up to 8 100 mL syringes simultaneously, offering compact size, lightweight design, and low noise levels. A 5-inch color LCD touchscreen displays real-time temperature, oscillation duration, and resting time. Users can freely select from three operational modes according to experimental requirements.
- Chromatographic degassing oscillation: maintained at 50°C for 20 minutes of oscillation followed by 10 minutes of static holding at constant temperature, automatically completing the degassing pretreatment.
- Water-soluble acid titration: performed at a constant temperature of 75°C under oscillation for 5 minutes, meeting the requirements for quantitative determination of water-soluble acids.
- Other physical oscillations: Set any temperature range from 0 to 99°C and any time interval from 0 to 99 minutes, making it suitable for various physical experiments requiring constant-temperature oscillation.
The power petrochemical laboratory frequently encounters three major technical challenges in practical operations: significant fluctuations in temperature control accuracy, unstable oscillation frequency, and deviations in sample sealing and temperature calibration. This instrument has been specifically optimized to address these issues.
The temperature control accuracy reaches ±0.2°C within the range of room temperature to 50°C, and ±0.3°C within the range of 50°C to 99°C, significantly outperforming traditional water bath oscillators. Equipped with a built-in digital PID automatic control algorithm, it effectively prevents temperature overshoot or fluctuations, ensuring both degassing efficiency and repeatability in water-soluble acid determination.
Equipped with high-quality motors and precision transmission mechanisms, the system maintains a stable oscillation frequency of 275 ± 3 cycles per minute and an oscillation amplitude of 35 mm. Even during prolonged continuous operation, it consistently preserves both frequency and amplitude stability, effectively preventing uneven sample mixing caused by mechanical aging.
The device features a dedicated thermometer socket and includes a standard insertion size positioning diagram (with steps secured using adhesive tape). Users can verify the displayed temperature against a standard thermometer at any time to ensure accurate and reliable temperature control. Additionally, the syringe holder incorporates an anti-slip positioning design combined with a tightly sealed needle interface, effectively preventing oil sample leakage or gas escape during agitation.
Based on our field investigations with over 100 users, the following erroneous operations frequently lead to invalid experimental results or equipment damage. This instrument has been specifically designed to mitigate these issues through both human-machine interaction and physical architecture improvements:
| Common Fehler Operations | Instrument Protection/Tip Design |
|---|---|
| The instrument was not installed on a horizontal, sturdy workbench, resulting in vibration-induced displacement. | The bottom features adjustable horizontal feet, and the startup interface displays a prompt: "Ensure the instrument is level." |
| Install in environments with corrosive gases or humidity ≥85%. | The manual explicitly states that the control circuit board is coated with a three-proof paint to enhance environmental adaptability. |
| Impact the touchscreen with your hand or a hard object. | The screen features a impact-resistant tempered glass panel, but users are still advised to avoid impacts. |
| Screen immersion in oil has caused touch functionality failure. | The screen is equipped with oil-resistant edges around its perimeter, and the upper cover effectively prevents oil splashing when closed. Additionally, a prominent "Do Not Immerse in Oil" warning label is provided. |
| The external thermometer was not properly positioned according to its dimensions, resulting in measurement deviation. | Randomly includes positioning adhesive tape and illustration cards for quick standard fixation; the software supports temperature correction offsets. |
| The test did not power off or exit directly by pressing the "Stop" button | During program execution, if an abnormal termination is detected, the system will automatically record the current status and initiate a safe shutdown to prevent dry burning of the heating element. |
| The syringe is overfilled or not securely locked. | The upper and lower layers together contain eight independent card slots, each equipped with an elastic pressure pad that produces a "click" sound upon proper insertion of the syringe. |
| Set the temperature above 99°C or the duration beyond 99 minutes | The touchscreen digital keyboard has built-in limits. The system will automatically reject inputs that exceed these ranges and display a prompt. |
Additionally, at the end of each testing cycle, a buzzer automatically sounds to prevent users from opening the lid prematurely and coming into contact with high-temperature samples or oil vapor.
- High power adaptability: Operates at AC 220V ±20% and 50 Hz ±5%, suitable for areas with significant grid voltage fluctuations.
- Maximum power consumption: 500 VA, energy-efficient and high-performance.
- dimensions: 53×37×39 cm, weight: 35 kg, suitable for standard laboratory workbenches.
- One-click operation: On the main interface, simply select "Chromatographic Degassing Oscillation," "Water-Soluble Acid Oscillation," "Other Physical Oscillations," or "Start Oscillation Immediately" (for rapid mechanical function testing) without complex programming.
This instrument features an integrated design combining precise temperature control, constant oscillation, intelligent operation processes, and error prevention mechanisms, providing comprehensive support for power systems, petrochemical laboratories, and third-party testing institutions.
- Improve the repeatability and reproducibility of chromatographic degassing and water-soluble acid determination;
- Reduce sample rejection rates and equipment failure rates caused by improper operation;
- Reduce reliance on operator experience and achieve standardized, automated pre-processing.