Bosch ETT 008.71 Betriebsanleitung Seite 27

5. Functions for setting parameters and test
functions
i The warm-up phase is not waited for in test mode.
Therefore, if measurements are taken in this mode, take zero-
point drift into account.
The following settings, displays and test functions are possible in
conjunction with the respective test system.
Displaying and changing:
- date and time
- lambda computation
- O measurement
2
- CO computation
vrai
Displaying:
- date for next maintenance work
- leakage test interval
- HC residue test before
each measurement
- maintenance interval in days and date
for next maintenance work
- interval for re-adjusting using test gas in days
- date for next re-adjustment due
- test-gas components for re-adjustment
- consequences if date for re-adjusting is
not kept to
- change of CO setting
vrai
- settings in compliance with
country-specific regulations
- NO-measurement
- NO sequential calibration setting
- NO consequences when adjustment is overdue
Test functions:
- carrying out a leakage test
- confirmation of maintenance work carried out
- re-adjusting using test gas
- adjusting a new O sensor
2
- O measurement via test-gas intake
2
- initial calibration of NO sensor
- NO interval calibration setting
- recalibration of NO sensor
5.1 Re-adjusting using test gas
The After-Sales Service Department sets the parameters of the
measuring instrument to comply with the regulations that apply in
your country. A test-gas mixture is required for carrying out re-ad-
justment, which has the following concentrations (as required):
HC: 200 to 2000 ppm vol. C
CO: 1 % vol. to 10 % vol. CO
CO : 5 % vol. to 18 % vol. CO
2
The test gas must be fed into the test-gas inlet/gas outlet (12)
via a viton hose at a flow rate of approx. 1 l/min. The flow rate is
indicated.
! Only connect the test gas hose when the test system signals
you to do so!
on/off
on/off
on/off
on/off
enabled/disabled
YES/NO
ON/OFF
H , (inputs in ppm propane)
3 8
2
5.2 Carrying out a leakage test
A leakage test can be carried out on the sampling system in con-
junction with the respective test system.
For this purpose, you must seal the sampling probe (9).
The sampling probe of the exhaust-gas measuring in-
strument may also become very hot depending on the
duration of the exhaust-gas measurement.
5.3 Installing and adjusting the O
- Disconnect the exhaust-gas measuring instrument from the
mains.
- Remove the protective cap (20) from the O
- Remove the jack from the O
of the instrument and unscrew the O
- Screw in the new O sensor by hand (do not use a tool!)
2
and reconnect the jack.
- Refit the protective cap (20).
- Reconnect the exhaust-gas measuring instrument to the
mains.
The new O sensor is adjusted under the test functions of the
2
respective test system.
i After being unpacked, the O
nutes to attain the necessary level of measuring accuracy.
5.4 Setting the parameters of the ETT 008.71 for use
in Britain in compliance with VI (Vehicle Inspecto-
rate) VPB/07/24/20.
Instrument settings:
- Lambda computation
- CO computation
vrai
- O measurement
2
Adjustment data:
- Maintenance interval, six-monthly
- Re-adjustment interval, six-monthly *)
- Gases for re-adjustment
- Consequences when overdue
- Leakage test, automatic **)
- HC residue test **)
- Change of CO setting
vrai
- complied with VPB/07/24/20
*) Interval for re-adjusting using a test-gas mixture is extended
to 365 days after the long-term stability of the instrument has
been confirmed.
**) Leak check (daily) and HC residue check are performed by
the software of the test system.
sensor
2
sensor.
2
sensor located in the rear panel
2
sensor.
2
sensor may require up to 30 mi-
2
on
off
on
183 days
183 days
HC CO CO
Error message
off
off
disabled
yes
2
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