User manual for the YTC4221 acid value meter, detailing operation, safety, specifications and maintenance.
The YTC4221 acid value meter is a fully digital, micro‑computer controlled instrument designed for measuring the acid value of transformer and turbine oil. It uses an automatic neutralization method with touch‑screen LCD control, providing fast analysis (about 2 minutes per sample) and the ability to store up to 35 measurement sets.
The manual covers safety precautions, installation, system calibration, sample preparation, measurement steps, data review, and routine maintenance such as pump cleaning, reagent replacement, and printer consumable changes. This manual is written in Chinese.
| Linear range | 0.001~0.900 mgKOH/g |
|---|---|
| Correlation coefficient | 0.999~0.9998 |
| Recovery rate | 99~102 % |
| Minimum resolution | 0.001 mgKOH/g |
| Repeatability (RSD) | 2~5 % |
| Accuracy (0.001~0.100 mgKOH/g) | ±0.003 mgKOH/g |
| Display | 5.4‑inch color LCD, full Chinese characters |
| Dimensions (W×H×D) | 420 mm × 190 mm × 340 mm |
| Power consumption | <150 W |
| Operating temperature | 0–40 °C |
| Relative humidity | ≤85 % |
The instrument can measure acid values from 0.001 to 0.900 mgKOH per gram.