Inhaltsverzeichnis
Werbung
Verfügbare Sprachen
Verfügbare Sprachen
3.4.1
Computer board interface
1
2
10
9
8
459969-072_Ko
Fig. 3:
Computer board interface
1 Audio (output)
2 Microphone
3 USB port 3.0
3 USB port 2.0
5 Monitor (VGA)
6 Serial interface
7 HDMI interface
8 Serial interface
9 Serial interface
10 LAN (RJ45)
3.4.2
LED status
LED
Off
Green light
Flashing green
3.5
Description of function
The BEA 065 is used to measure the exhaust gas com-
ponents CO, HC, CO
, O
2
2
ted). The excess air factor (Lambda) is calculated on
the basis of the gas values measured.
The non-dispersive infrared method (NDIR – non-disper-
sive infrared spectroscopy) is employed for measuring
the CO, CO
and HC quantities. The oxygen is deter-
2
mined using a sensor with electro-chemical action.
Robert Bosch GmbH
3
4
5
6
7
Status
BEA 065 off
BEA 065 on
No paper in printer or printer
compartment open
and NO (NO can be retrofit-
Product description | BEA 065 | 21
Warm-up time
The BEA 065 warm-up time is approx. 1 minute. Mea-
surements 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 anal-
ysis system is automatically calibrated (duration 30 sec-
onds) with ambient air (zero gas).
Zero calibration during exhaust emissions tests
Following the start of an exhaust emissions test, the
BEA 065 automatically implements a system check with
ambient air at irregular intervals. To perform the system
check, the BEA 065 switches a solenoid valve to ambi-
ent air. The system is flushed with zero gas for 30 sec-
onds. An active carbon filter removes the hydrocarbons
from the ambient air drawn in.
Lambda air ratio measurement
The BEA 065 calculates the excess air factor (Lambda)
from the measured HC, CO, CO
tions.
Precise oxygen measurement is important for Lambda
calculation. Lambda calculation and oxygen measure-
ment must be activated for this purpose.
The Lambda value is calculated with the aid of the
Brettschneider formula:
[
]
CO
[
]
[ ]
H
+
+
+
CV
CO
O
x
2
2
4
2
λ
=
H
O
CV
CV
+
−
1
x
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 065 is equipped with an O
sor 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 concentra-
2
[
]
O
(
3 5
,
[
] [
CV
−
+
x
CO
CO
[
]
2
CO
2
+
3 5
,
CO
2
(
)
[
] [
]
[ ]
+
+
CO
CO
K x HC
2
1
sensor. The O
2
2
|
1 689 989 318
2017-01-20
en
)
]
sen-
Werbung
Inhaltsverzeichnis
