Found 15 matching results
(CN → US)
| HS Code | Official Doc | Tariff Rate | Origin | Destination | Effective Date |
|---|---|---|---|---|---|
| 9026802000 | Doc | 55.0% | CN | US | 2025-05-12 |
| 9026806000 | Doc | 37.5% | CN | US | 2025-05-12 |
| 9014804000 | Doc | 55.0% | CN | US | 2025-05-12 |
| 9014805000 | Doc | 55.0% | CN | US | 2025-05-12 |
| 9032896030 | Doc | 56.7% | CN | US | 2025-05-12 |
| 9032896040 | Doc | 56.7% | CN | US | 2025-05-12 |
| 9031808085 | Doc | 30.0% | CN | US | 2025-05-12 |
| 9031804000 | Doc | 55.0% | CN | US | 2025-05-12 |
| 8531100035 | Doc | 56.3% | CN | US | 2025-05-12 |
| 8531100045 | Doc | 56.3% | CN | US | 2025-05-12 |
| 8512300040 | Doc | 57.5% | CN | US | 2025-05-12 |
| 8512909000 | Doc | 57.5% | CN | US | 2025-05-12 |
| 3901909000 | Doc | 61.5% | CN | US | 2025-05-12 |
| 3901905501 | Doc | 61.5% | CN | US | 2025-05-12 |
| 3914006000 | Doc | 58.9% | CN | US | 2025-05-12 |
Oil Alarm
An oil alarm is a safety device designed to detect and alert users to low or critically low levels of oil in machinery, particularly in oil-filled electrical equipment like transformers. These alarms prevent damage and potential hazards associated with oil starvation and overheating.
Material:
- Sensing Element: Typically utilizes float switches, capacitive probes, or optical sensors. Float switches are common due to their simplicity and reliability. Capacitive probes detect oil level changes based on dielectric constant variations. Optical sensors use light refraction to determine oil level.
- Housing: Constructed from materials compatible with mineral oil, such as steel, aluminum, or engineered plastics. The housing must be robust and resistant to oil leakage and environmental factors.
- Electrical Components: Include relays, circuit boards, and power supplies, often encased in protective enclosures.
- Alarm Indication: Visual indicators (lights, displays) and audible alarms (bells, sirens) are used.
Purpose:
- Prevent Equipment Failure: Low oil levels can lead to insufficient cooling and insulation, resulting in overheating, winding damage, and eventual transformer failure.
- Fire Prevention: Overheated oil can ignite, causing fires and explosions.
- Reduce Maintenance Costs: Early detection of low oil levels allows for timely replenishment, preventing costly repairs or replacements.
- Environmental Protection: Oil leaks can contaminate the environment; alarms help prevent significant leaks due to equipment failure.
Function:
Oil alarms continuously monitor the oil level within a piece of equipment. When the oil level drops below a pre-set threshold, the alarm is triggered. The alarm system typically operates as follows:
- Sensing: The sensing element detects the oil level.
- Signal Processing: The signal from the sensor is processed by the alarm control unit.
- Alarm Activation: If the oil level is below the threshold, the control unit activates the visual and/or audible alarm.
- Remote Signaling (Optional): Some alarms include remote signaling capabilities, sending alerts to a central monitoring system via SCADA or other communication protocols.
Usage Scenarios:
- Power Transformers: Critical application in substations and power plants.
- Distribution Transformers: Used in local distribution networks.
- Oil-Filled Circuit Breakers: Monitoring oil levels ensures proper operation and prevents failures.
- Large Electric Motors: Some large motors utilize oil for cooling and insulation.
- Gearboxes: Oil level monitoring in gearboxes prevents damage due to insufficient lubrication.
Common Types:
- Float Switch Alarms: Employ a float that rises and falls with the oil level. A magnetic switch is activated when the float reaches a specific position. Simple, reliable, and cost-effective.
- Capacitive Alarms: Utilize a probe that measures the dielectric constant of the surrounding material. Changes in oil level alter the capacitance, triggering the alarm. More sensitive than float switches.
- Optical Alarms: Use light refraction to detect oil level changes. Can be highly accurate but may be more susceptible to contamination.
- Magnetic Level Gauges with Alarm Switch: Combine a visual level gauge with a magnetic switch for alarm functionality.
- Electronic Oil Level Sensors: Advanced sensors utilizing various technologies (ultrasonic, radar) for precise and continuous oil level monitoring. Often include data logging and communication capabilities.
Based on the provided information, “oil alarm” can be classified under the following HS codes:
- 8531100035: Burglar or fire alarms and similar apparatus; Burglar alarms. This code covers electric sound or visual signaling apparatus, specifically burglar alarms. An oil alarm, functioning as a security or safety device detecting oil leaks, falls under this category. The total tax rate is 56.3%.
- 8531100045: Burglar or fire alarms and similar apparatus; Other. This code also covers electric sound or visual signaling apparatus, but for alarms not specifically categorized as burglar alarms. If the oil alarm has functions beyond a simple burglar alarm, it may fall under this code. The total tax rate is 56.3%.
- 8512300040: Electrical lighting or signaling equipment; Sound signaling equipment; Other. This code covers sound signaling equipment used for cycles or motor vehicles. If the oil alarm is designed for use in vehicles, it may fall under this code. The total tax rate is 57.5%.
Regarding HS code 8531100035 and 8531100045, please note that these are electric sound or visual signaling apparatus, and the total tax rate is 56.3%.