Depth

The derived depth channel is calculated from the measured pressure channel, where there are two possible methods for calculating the depth.  Both methods require that the pressure reading (P), which is taken with an absolute pressure transducer, be adjusted using the atmospheric pressure:

Pressure = P - atmospheric pressure (dBar)                                                              [1]

After this, the depth (meters) can be calculated using either:

depth (m) = pressure / 0.980655 (rho)                                                                               [2]

where rho is the density of the water.

2. The Seawater method taken from UNESCO Technical Paper in Marine Science No. 44.

Is a more complex method and is described in our application notes.

Contact RBR for the application note on "The Calculation of Physical Values for Water" for the depth derivation.