ETAS
ES430.1 - User’s Guide
56
6.4
Installing the Lambda Sensor
The following general guidelines apply when installing the LSU lambda sensor:
• Make sure that you install the sensor in exhaust pipes at a point at which
the exhaust gas composition is representative and remains within the
prescribed temperature limits.
The following maximum values apply to the lambda sensor (which is not
part of the delivery scope of the ES430.1):
Cold exhaust gas at a high flow velocity can lead to the operating tem
-
perature of the sensor cell varying, depending on the operating voltage.
This may result in measurement errors.
Hot exhaust gas at temperatures above the controlled ceramic tempera
-
ture may cause the operating temperature of the sensor cell to rise. This
also may result in measurement errors.
• The active sensor ceramic is heated up quickly by the internal heater.
The place of installation should be selected to ensure that the amount of
condensate penetrating from the exhaust gas system is minimal in order
to avoid ceramic breakages.
The point of installation and position of the sensor should fulfill the fol
-
lowing requirements:
– Install the sensor as near the engine as possible. Maintain the mini
-
mum distance from the combustion chamber of 15 cm.
– Ensure rapid warm-up of the exhaust pipes just upstream of the sen
-
sor installation point.
– As far as possible, ensure the exhaust pipes are on a downward
stretch to avoid the accumulation of condensate upstream of the
sensor installation point (no recesses, projections, cutting edges).
• The angle of installation should be inclined at least 10° to the horizontal
(tip of the sensor pointing downwards).
Fig. 6
-
14
Angle of Installation
TIP
For more details on the lambda sensor LSU4.9, consult “Bosch: Technical
Customer Information on the LSU4.9” (Y 258 K01 008-000e).
Sensor
Max. Gas Temperatur
Max. Temperature at
the hexagonal Srew
LSU4.9
930 °C
570 °C
