4
Friedrich Leutert GmbH & Co. KG
Engine Indicator S1 - Operating instructions
Fig. 1 - Schematic drawing
Application and Product Description
The Leuter Indicator Type S1 can handle higher speeds and is, therefore,
the choice device where the helical spring indicators Type 50Z1 and
30/1 are no longer suitable.
It is a mechanical indicator that still records a clear diagram at speeds
above 800 min
-1
and pressure change rates exceeding 24000 bar/sec.
Fig. 1 shows the schematic outlines of the Leutert bar spring indicator
drawing particular attention to its principal features. Contrary to the
indicators types 50Z1 and 30/1, the type S1 indicator has a bar spring
(2) instead of a double-coiled helical spring which - being a body of
almost equal resistant - is stressed by bending. The special design of its
indicator places its natural frequency far above that of indicators using a
helical spring. Consequently, type S1 indicator permits perfect diagrams
to be obtained at speeds up to about 2400 min
-1
and pressure change
rates up to about 32000 bar/sec.
The number of natural frequencies of the indicator is calculated about
(340/
√
f) + 40, f = scale of the bar spring to be used in mm/bar, referring
to the 1/1 piston.
Safety Instruction
DANGER! Before using indicator, open indicator valve or cock,
blow out any dust, and close it again. Hot gas and particles may
be ejected. WEAR GLOvES AND SAFETy GLASSES!
