Depth gauge

The depth gauge is an important part of diving equipment and displays the diver 's current and usually its maximum depth of.

In submarines, it is also used to determine the depth position of the boat.

In shipping, the echo sounder or hand lead one is used to measure the depth of water under the ship used.

Function

The depth gauge is a pressure gauge (manometer). Because with increasing water depth increases, the pressure (1 bar to 10 m), the exact depth can be determined by the pressure difference to the water surface.

There are different types of depth gauges:

Boyle Mariottescher depth gauge

The Boyle's depth gauge consists of a circularly curved, semi- open glass tube. He has no moving parts. When diving, the water penetrates into the tube and compressed depending on the depth, the air therein. The edge of the air bubble in the tube indicates a scale to the depth. In the depth range up to 10 m of depth gauge indicates quite precisely. Because the pressure in the range of 1 doubled to 2 bar, the half of the scale is available for this purpose. In greater depths, the display is always accurate. The maximum depth can not hold with this depth gauge.

Tube depth gauge

A depth gauge of the tube spring is composed of a bent tube made ​​of resilient metal, the Bourdon tube, to which the water pressure depending on the design of the depth gauge of the inside or from the outside is applied. When the pressure increases, the tube stretches; if it decreases, it takes the original curvature again. This motion is transmitted to a pointer that can mark the maximum depth reached with a drag pointer. The accuracy of the display is good.

Membrane depth gauge

When membrane depth gauge, the water pressure on a flexible metal can which is compressed more and more with increasing water pressure acts. The movement of the membrane is also transmitted to a pointer and if necessary drag pointer. The accuracy of the display is very good.

Dive Computers

In a deep dive computers meter is integrated, digitized, whose measured values ​​and (zero time or decompression ) are used in the calculation of immersion time. The depth is displayed along with the other values ​​on the display as a number. The maximum depth or even the complete dive profile is stored electronically. Dive Computers contain large majority of a piezoelectric pressure sensor. Rarely, capacitive or inductive pressure sensors are installed.