Operation Manual / 4 Product description / A100-L
4 Monitoring during operation / 4.4 Low pressure measurement at
the filter silencer
© Copyright 2020 ABB. All rights reserved.
HZTL4034_EN
Rev.P
January 2020
4.3.5
Malfunction of the speed measurement system
The possible reasons for malfunction of the speed measuring system are described in
chapter Troubleshooting.
4.4
Low pressure measurement at the filter silencer
4.4.1
Introduction
The low pressure measurement with a U-tube manometer is used for the following pur-
poses:
¡
During acceptance test of the engine: Measurement of the correction factor for the cal-
culation of the turbocharger efficiency
¡
When using a filter mat: An increased pressure loss indicates an increase in the fouling of
the filter material.
4.4.2
U-tube manometer at the filter silencer
Fig. 11: U-tube manometer at the filter silencer
81000
Filter silencer
81050
U-tube manometer
A
[mm H
2
O]
Pressure loss / pressure difference
If the turbocharger is operated at maximum engine power and pressure loss (A) reaches the
value of 200 mm H
2
O:
u
Clean filter mat.
Reading of pressure loss
For simple reading of the pressure loss (A), the dipstick at the U-tube manometer can be
pulled out to the level of the lower water level. Better readability of the U-tube manometer
can be achieved by filling with slightly coloured water.
u
Colour the water with food colouring or ink.
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