A linear gauge includes a contact member having a lower tip to be positioned facing a workpiece; an air slider including a cylinder surrounding the contact member with a clearance left between them, and configured to eject air such that the contact member is supported movably in a vertical direction; a scale that detects a height position of the contact member; a casing accommodating therein the contact member, the air slider, and the scale; an evacuation portion formed in an upper portion of the cylinder such that the ejected air is evacuated into the casing; and a communication channel communicating an inlet, which is formed in an upper portion of the contact member, and an outlet, which is formed in the lower tip of the contact member, with each other inside the contact member.

A linear gauge includes a contact member having a lower tip to be positioned facing a workpiece; an air slider including a cylinder surrounding the contact member with a clearance left between them, and configured to eject air such that the contact member is supported movably in a vertical direction; a scale that detects a height position of the contact member; a casing accommodating therein the contact member, the air slider, and the scale; an evacuation portion formed in an upper portion of the cylinder such that the ejected air is evacuated into the casing; and a communication channel communicating an inlet, which is formed in an upper portion of the contact member, and an outlet, which is formed in the lower tip of the contact member, with each other inside the contact member.

Systems and methods determine a fluid efficiency of a fluid that flows through a fluid power system. A magnetic flux gradient generated by a magnetic fluid filter positioned on a flow path as the fluid flows through the magnetic fluid filter is monitored in real-time by a fluid monitoring device that is coupled to the fluid power system. A fluid status is determined in real-time that is associated with the magnetic flux gradient from fluid parameters associated with the magnetic flus gradient as detected by the fluid monitoring device. The fluid status of the fluid is determined in real-time that indicates that a corrective action is to be executed to increase a quality of the fluid based on the fluid parameters detected by the fluid monitoring device. The degradation to components of the fluid power system increases without the corrective action being executed to increase the quality of the fluid.

The present invention is a for monitoring and alerting an operator to internal piping air pressure variations whereby said system includes an air pressure gauge and a smart screen, whereby said smart screen is constructed with communications capability to alert a system operator in real time when a pressure threshold has been breached.