What filtration method is connected only when in use and can be disconnected after use?

What filtration method is connected only when in use and can be disconnected after use?

• A. Suction line (Mesh)
• B. Pressure line filter (high pass)
• C. Off-line filtration
• D. Return line filter (low pass)

Answer: (C)

Off-line filtration is a filtration method used to clean hydraulic oil when you need to, and then it’s disconnected afterward. It involves a separate filtration loop that is connected to the system only during the filtration task, drawing oil out, filtering it, and returning it to the reservoir. Because it’s not part of the normal circulating path, it doesn’t affect the system when not in use and can be removed once the cleaning is finished. This is different from inline options, which are permanently in the main flow and filter oil as the system runs. Suction line mesh, pressure line high-pass, and return line low-pass filters stay in the circuit during operation, providing continuous protection, rather than being connected only for a maintenance filtration cycle.