vanEssen TD-Diver DI8 Series, Руководство по эксплуатации продукта

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measured by a Baro-Diver and subsequently be used in the Diver-Office software to convert the Diver
pressure readings into water level data.
Measuring Water Level
All Divers establish the height of a water column by measuring the water pressure using the built-in
pressure sensor. As long as the Diver is not submerged in water it measures atmospheric pressure, just
higher the water column the higher the measured pressure. The height of the water column above the
Diver's pressure sensor is determined based on the measured pressure.
To measure these variations in atmospheric pressure a Baro-Diver is installed for each site being
measured. The barometric compensation for these variations in atmospheric pressure can be done
using the Diver-Office software, see
www.vanessen.com for a free download. It is also possible to use
alternative barometric data such as data made available online.
The barometrically adjusted water values can be related to a reference point such as the top of the
monitoring well or Mean Sea Level (MSL) or any other vertical reference datum.
1.3.1 Converting Diver Data into Water Level
This section explains how to calculate the water level in relation to a vertical reference datum using
the Diver and Baro-
The figure below represents an example of a monitoring well in which a Diver has been installed. In
this case we are therefore interested in the height of the water level (WL) in relation to the vertical
reference datum. If the water level is situated above the reference datum it has a positive value and a
negative value if it is situated below the reference datum.
The top of casing (TOC) is measured in relation to the vertical reference datum and is denoted in the
diagram below as TOC. The Diver is suspended with a cable with a length CL. If the cable length is not
exactly known, it can be calculated from a manual measurement as described in section 1.3.2.
The Baro-Diver measures the atmospheric pressure (p
baro
) and the Diver measures the pressure
exerted by the water column (WC) above the Diver and the atmospheric pressure (p
Diver
).