Friedrich Leutert GmbH & Co. KG 5
Digital Pressure Indicator DPI - Bedienungsanleitung
2 Product description
2.1 Application and function
The DPI (Digital Pressure Indicator) measures dynamic pressures. It serves
for Analysis of combustion processes in 2- and 4-stroke large diesel engi-
nes. The measurement is carried out via an indicator valve. This electronic
indicator is the consistent further development of the successful digital in-
dicators of the DPI range and replaces all mechanical indicators.
In order to be able to measure pressure profiles with the DPI each cylinder
of the engine must be equipped with a standard indicator valve. By means
of the Thompson adapter the DPI pressure sensor is temporarily mounted
to the corresponding indicator valve. The construction of the Thompson
adapter minimizes the risk of overheating since the heat is dissipated quick-
ly.
By using a high-resolution sensor and a very high query rate of the hand-
held device the DPI can assign a crank angle performance and create a
power calculation without the use of a TDC sensor.
The electronics of the battery-operated DPI handheld device is installed in a
robust splash-proof plastic housing. The low mass display is not pulled out
of its seat in the event of impacts as it is often the case with larger displays.
Menu texts and measurement data are shown on the LC display of the DPI
hand-held device. The menu structure is easy to grasp and enables you to
operate measuring system intuitively. The menu-driven control enables you
to use the DPI effectively after a short time.
The DPI is operated with standard AA batteries which can be replaced by
releasing a single screw.
The measurement results are displayed during the respective cylinder me-
asurement on the display of the DPI handheld device and are saved on the
device‘s internal SD card.
A data set consists of several measurements (cylinder numbers) that
amongst other things contain the following values:
– Place of measurement (ship name)
– Engine name
– Date / time
– Number of measuring cycles (cycles)
– Highest cylinder pressure (Max. Press.)
– Average cylinder pressure (Avg. Press.)
– Lowest cylinder pressure (min. Press.)
– Engine speed (RPM)
– Boost pressure
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