Bosch BEA 060 - Functional description; Excess air factor measurement; Oxygen measurement

1 689 989 112 2020-06-24| Robert Bosch GmbH
| BEA 060 | 21 | en
O2
N0
AF I
GF 3 GF 2
BEA 060
459907_1Ko.eps
1
2
3
5
6
7
8
9
10
11
12
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14
16
18
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11-16V
17
4
20 W
Fig. 1: BEA 060
1 Coarse filter GF2
2 Coarse filter GF3
3 Mains connection
4 Holes for cable tie (power cord strain relief)
5 Measurement gas inlet
6 Activated charcoal filter AF1
7 O
2
sensor
8 Measurement gas outlet
9 Condensate outlet
10 Test gas inlet
11 NO sensor
1)
12 Connection for cigarette lighter socket connecting cable
1)
13 USB connection
14 Connection for connecting cable 1 684 463 810
1)
to
BEA040/BDM300
1)
15 Connection for oil temperature sensor
16 LED
17 On/Off button
18 Carrying handle
1)
Special accessories
3.6 LED status
LED Status
Off BEA 060 off
Alternate orange and green flashing
at one-second intervals
BEA 060 on and
ready for operation
Rapid alternate orange and green
flashing
USB or Bluetooth
communication with
BEA software
Rapid alternate orange and green
flashing (BEA software not started)
Firmware defective
Red light BEA 060 defective
3.7 Functional description
The BEA 060 is used to measure the exhaust gas
components CO, HC, CO
2
, O
2
and NO (NO can
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
2
and HC components. The
oxygen is determined using a sensor with electro-
chemical action.
Warm-up time
The BEA 060 warm-up time is approx. 1 minute.
Measurements cannot be taken during this period.
Zero calibration at the start of exhaust gas
measurement
After switching on the pump, the zero point of the
analysis system is automatically calibrated (duration
30seconds) with ambient air (zero gas).
Zero calibration during exhaust gas measurement
Following the start of exhaust gas measurement, the
BEA 060 automatically implements a system check
with ambient air at irregular intervals (the oxygen
measurement drift is monitored and re-adjusted if
necessary). To perform the system check, the BEA 060
switches a solenoid valve to ambient air. The system
is flushed with zero gas for 30 seconds. An activated
charcoal filter removes the hydrocarbons from the
ambient air drawn in.
Excess air factor measurement
The BEA 060 calculates the excess air factor
(Lambda) from the measured HC, CO, CO
2
and oxygen
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:
[ ]
[ ]
[ ]
[ ]
[ ]
[ ] [ ]
( )
[ ] [ ] [ ]
( )
λ =
+ + +
+
−












+
+ −






+ +
CO
CO
O
H
x
CO
CO
O
x CO CO
H O
x CO CO K x HC
CV
CV
CV CV
2 2
2
2
2 1
2
4
3 5
3 5
2
1
4 2
,
,
[] Concentration in % by vol, also for HC
K
1
Conversion factor for HC from NDIR to FID (value 8)
Hcv Hydrogen/carbon ratio in the fuel
(typically 1.7261) *
Ocv Oxygen/carbon ratio in the fuel
(typically 0.0175) *
* Depending on the fuel used.
Oxygen measurement
The BEA 060 is equipped with an O
2
sensor. The O
2
sensor is a wearing part.
The oxygen measurement is automatically compared to
the air oxygen content of 20.9 % by vol and is required
for Lambda calculation.