Which of the following is true for a hydraulic load cell?
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A.
This technology is cheaper than all other types of load cells.
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B.
These type of load cells are not effective devices in outdoor environments.
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C.
The load cell is completely filled with oil.
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D.
The piston does actually come in contact with the load cell.
Correct Answer:
C. The load cell is completely filled with oil.
Explanation:
A hydraulic load cell is a mechanical force transducer that operates based on the movement of a piston and a thin elastic diaphragm. When a load is applied to the piston, it compresses the liquid medium within the device, typically oil, causing an increase in pressure that is directly proportional to the force. This pressure is then transmitted to a gauge or transducer to provide a measurement. Because these devices lack electrical components at the point of sensing, they are highly robust and ideal for use in hazardous or outdoor environments where they are immune to electrical surges and lightning.
Key features of hydraulic load cells include: - Operational Principle: They function based on Pascal's Law, where pressure applied to a confined fluid is transmitted equally in all directions.
- Construction: The unit is completely filled with oil or hydraulic fluid, which is essential for transmitting the applied force as pressure.
- Durability: Their design is resistant to moisture, dust, and temperature fluctuations, making them more effective than many electronic alternatives in harsh conditions.
- Safety: The absence of electricity makes them suitable for explosive or hazardous areas.While they offer high accuracy and a wide load range, they may be more expensive to manufacture than common strain gauge load cells and require maintenance to prevent fluid leakage. Regardless, the core defining characteristic of their internal setup is that the load cell is completely filled with oil to facilitate the measurement process.
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