Pressure gauge

from Wikipedia, the free encyclopedia

As a pressure gauge (lat. Finis end ), a pressure gauge designated (pressure meter), which, for. B. Scuba divers or breathing apparatus wearers shows the remaining pressure in their compressed air cylinder . Finimeter was originally a brand name of the Drägerwerk .

It is connected to the high pressure outlet of the first stage of the regulator . The pressure is directed into a Bourdon tube that is coiled inwards in a spiral , which expands as a result. At the end there is a pointer on one axis. The pressure can be read on a scale at the tip of the pointer. With some finimeters, two gears are used for amplification / translation.

The functional principle can be illustrated with a garden hose: The hose is rolled up in the grass and the end is closed. When you turn on the tap, the pressure causes the hose to stretch.

Pressure gauges are available as solo instruments, but are also installed in consoles: in 2 or 3 consoles together with a depth gauge (usually with a drag pointer to display the greatest depth) and a dive computer or compass. In the meantime, some manufacturers do not use a Bourdon tube, but rather copper-beryllium spirals. Today, the pressure indicators are mainly suitable for displaying values ​​up to 300 bar filling pressure.

mechanism

Annotated mechanics

Stationary parts:

A) Fixing the Bourdon tube (fixed end)
B) carrier plate
C) Bearing plate (positions the axes of the moving parts)
D) rivets (connect the bearing plate and the carrier plate)

Movable parts:

  1. Fixed end of the Bourdon tube
  2. Movable end of the Bourdon tube ( Bourdon tube )
  3. joint
  4. Reins
  5. Lever (connected to the gear)
  6. Axis of the lever and gear
  7. gear
  8. Pointer axis (with small gear)
  9. Return spring

See also

Web links

Commons : Finimeter  - album with pictures, videos and audio files