Downloaded from www.Manualslib.com manuals search engine 83
Operation
Measurement is performed by way of a
special capacitor which can absorb water
vapour. The water absorbed produces a
change in the electrical properties and thus
the capacitance of the capacitor. The
capacitance measurement thus provides
information on the humidity level. The sender
electronics convert the measured capacitance
into a voltage signal.
Measurement of windscreen temperature
Physical principles
All bodies exchange heat with their
environment in the form of electromagnetic
radiation. This electromagnetic radiation can
include thermal radiation in the infrared
range, visible light or ultraviolet components.
The wavelength of the radiation emitted
depends on the temperature of the actual
body. A change in the temperature of the
body alters, for example, the infrared
component of the radiation emitted. The
temperature of the body can be determined
in a non-contacting manner by measuring the
infrared radiation emitted.
Operation
The infrared radiation emitted by a body
(windscreen) is measured by means of a
highly sensitive infrared radiation sensor.
A change in the temperature of the
windscreen also produces a change in the
infrared component of the thermal radiation
emitted by the windscreen. This is detected
by the sensor and converted by the sensor
electronics into a voltage signal.
SSP282_105
SSP282_106
Downloaded from www.Manualslib.com manuals search engine M
MMMMMMMMMMMMM
M
V50 N175 N176G238 G65 G107 G348 G347Z43 Z42
J126
V2Z45 G344 Z46
G345 3015
SS
15A5A
75
S
25A
75
S
25A
C20
S
20A
N340G355
J528J533
S
10A
30
G89
G150 G151 G263
V221
V111 V110 V220
V102 V68 V109 V108 V199 V200 V107 V71 V113J255 V42 G5658S
58S
G143G113 G135
G318G317G139
G140G92
G138G351G136
G137G35231
inout
2
31
4
G191
N280
M
T16
Colour code
= Input signal
= Output signal
= Positive supply
= Earth
= Convenience CAN High
= Convenience CAN Low
= LIN busAdditional signals
Climate control LIN bus for
– Heated windscreen
control unit J505
– Driver seat ventilation
control unit J672
– Front passenger seat ventilation
control unit J673
1Terminal 30/blower
Terminal 30/front seat heating
Input/rear roller blind switch E1492
3
4
SSP282_109
