List the primary elements and sensors associated with level.
What will be an ideal response?
Examples of level elements and instruments include:
• Displacer— buoyancy devices
• Sight glass—transparent tube mounted on the side of a tank.
• Float and tape—float rests on the surface of the fluid. Tape moves up and down depending on the level.
• Conductivity probes—high and low level alarms. Use electricity to complete lower leg circuit. If liquid reaches the higher leg, the circuit is broken. This type of system is designed to keep the level between the high and low conductivity probes. Typically used on non-flammable material.
• Capacitance probes—radiation devices, load cells.
• D/P cell (Transmitter)—converts pressure difference to a level indication. Measures hydrostatic pressure difference between two points on a pressurized vessel.
• Continuous level detector gauge—pressure sensitive. Measures hydrostatic pressure in open vessels.
• Bubbler system—forces air through a tube that is positioned in the liquid. The liquid’s resistance to flow registers on a pressure sensitive level gauge. Measures hydrostatic pressure in open vessels.
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Watery blisters and thick white skin between the toes are signs of:
What will be an ideal response?