Mechanical Construction And General; Mechanical Construction; General Description; Explanation Of Terms Used - Bosch RTM 430 Instandsetzungsanweisung

1.4 Modification on RTM 430
(production date after 5/97) v-
s. RTM 430 (Production befo-
re 5/97)

2. Mechanical construction

and general description of
device function
2.1 Mechanical construction

2.2 General description

2.3 Explanation of terms used

2.4 Load method

Modifications:
- Component holder*
- Catcher pan*
- Shield* (Pos. 16)
- Install the ferrite core on the
shield
- Protective shield (Pos. 23)
* Isn`t compatible to RTM-predecessor
1 Connection fitting for exhaust-gas
sampling hose
2 Indicator lamp
3 Lead-sealing point
4 Closing cover for receiver
5 Connection fitting for workshop
extractor
6 Closing cover for emitter
7 Connection socket for connection
cable to power pack
The Exhaust-Gas Opacity Module RTM 430 is used to detect the absorption coefficient
K (1/m) of the exhaust gas on compression-ignition engines. For this purpose, the official
measurement involves part of the exhaust gas from the tailpipe of the vehicle being
supplied via an exhaust-gas sampling probe and a sampling hose to the measurement
chamber (without suction assistance) during free acceleration, after which the opacity is
measured. This means that the system measures the level of light attenuation from which
the absorption coefficient is determined arithmetically.
– Effective measuring length
The measuring length (432 mm) is the optical distance through which the exhaust gas
flows. It is adjusted to various, country-specific measuring lengths by conversion (K
factor).
– Opacity (%) and absorption coefficient (k factor, 1/m)
The opacity and the absorption coefficient are a measure of the light quantity
attenuated (absorbed) by soot, white smoke and blue smoke.
– Mass concentration (mg/m3)
The mass concentration indicates the quantity of particles emitted by the diesel vehicle
referred to 1 m3 of exhaust gas. The basis for conversion to the mass concentration
is the conversion table elaborated by the British Motor Industry Research Association
(MIRA).
The diesel engine operates against a load and is tested at one or more type-specific test
engine speeds.
23
7
1
6
5
16
459679/1Ha
2
3
4
47