Description Of Unit; Led Status; Description Of Function - Bosch BEA 055 Originalbetriebsanleitung
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- Originalbetriebsanleitug (282 Seiten)
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18 | BEA 055 | Symbols used
3.4
Description of unit
The BEA 055 consists of a computer board with
temperature, engine speed and exhaust gas
measurement functions. In the BEA 950, the
communication between the PC and the BEA 055 is
carried out via a USB connection.
14
13
11-16V
12
10
11
Fig. 1:
BEA 055
1 Coarse filter GF2
2 Coarse filter GF3
3 Exhaust gas measurement inlet
4 Active carbon filter AF1
5 O
sensor
2
6 Exhaust gas measurement outlet
7 Condensate port
8 Calibrating gas inlet
9 NO sensor (special accessory)
10 Power supply socket
11 USB connection
12 Connection for connecting cable 1 684 463 810
BEA 040/BDM 300
1)
13 Connection for oil temperature sensor
14 LED
sometimes included in special accessories
1)
3.5
LED status
LED
Off
Alternate orange and green flashing
at one-second intervals
Rapid alternate orange and green
flashing
Rapid alternate orange and green
flashing (Bosch Emissions Analysis
software not started)
Red light
3.6
Description of function
The BEA 055 is used to measure the exhaust gas
components CO, HC, CO
2
be retrofitted). The excess air factor (Lambda) is
calculated on the basis of the gas values measured.
The non-dispersive infrared method (NDIR – non-
dispersive infrared spectroscopy) is employed for
measuring the CO, CO
and HC quantities. The oxygen
2
is determined using a sensor with electro-chemical
action.
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459906_1Ko.eps
GF 3
GF 2
O2
AF I
N0
9
8
7
6
5
4
3
to
1)
Status
BEA 055 off
BEA 055 on and ready
for operation
USB communication
with Bosch Emissions
Analysis software
Defective firmware
BEA 055 defective
, O
and NO (NO can
2
Warm-up time
The BEA 055 warm-up time is approx. 1 minute.
Measurements cannot be taken during this period.
Zero calibration at the start of exhaust emissions
tests
After switching on the pump, the zero point of the
analysis system is automatically calibrated (duration
30 seconds) with ambient air (zero gas).
1
Zero calibration during exhaust emissions tests
2
Following the start of an exhaust emissions test, the
BEA 055 automatically implements a system check
with ambient air at irregular intervals. To perform the
system check, the BEA 055 switches a solenoid valve
to ambient air. The system is flushed with zero gas
for 30 seconds. An active carbon filter removes the
hydrocarbons from the ambient air drawn in.
Lambda air ratio measurement
The BEA 055 calculates the excess air factor (Lambda)
from the measured HC, CO, CO
concentrations.
Precise oxygen measurement is important for
Lambda calculation. Lambda calculation and oxygen
measurement must be activated for this purpose.
The Lambda value is calculated with the aid of the
Brettschneider formula:
[
]
CO
H
[
]
[ ]
CO
O
+
+
+
2
2
2
λ
=
H
O
CV
1
+
−
4
2
[]
Concentration in % by vol, also for HC
K
Conversion factor for HC from NDIR to FID (value 8)
1
Hcv Hydrogen/carbon ratio in the fuel (typically 1.7261) *
Ocv Oxygen/carbon ratio in the fuel (typically 0.0175) *
*
Dependent on the fuel used.
Oxygen measurement
The BEA 055 is equipped with an O
sensor is a wearing part.
The oxygen measurement is automatically adjusted to
the air oxygen content of 20.9 % by vol and is required
for Lambda calculation.
and oxygen
2
[
]
O
3 5
,
CV
(
[
CV
x
x
CO
−
[
]
4
CO
2
3 5
,
+
CO
2
(
)
CV
[
] [
]
[ ]
x
CO
CO
K x HC
+
+
2
1
sensor. The O
2
Robert Bosch GmbH
)
] [
]
CO
+
2
2
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