Special tools and workshop equipment required

• Exhaust gas analyser - SAT 3500ACheck

Check prerequisites

• Allow the engine to reach service temperature.
• Oil temperature should be above 70 ºC
• Turn off all electricity consumers.
• Air filter must be OK.
• There should be no fault recorded.
• The exhaust system must be sealed.

• Switch on the exhaust gas analyser - SAT 3500A- .

The display for warm-up phase appears.

When F2 diesel is selected, the gas measure screen is displayed.

(The equipment must be calibrated with the probe in the exhaust tube).

NOTICE If the chamber is connected when the equipment is already operating, when the diesel test is selected a pre-heating message will appear while preheating is being done, and until the preheating time is over no other function can be accessed. When this message disappears, the following will be displayed:

• Rapid test ..... F1

• Official test ..... F2

Rapid test

If  F1 is pressed the screen displayed will be similar to the following table:

According to the message on the screen, two accelerations must be done to clean the exhaust tube before connecting the probe.

Once this is done, press a function key Q to cancel the message.

• Calibrate the exhaust gas analyser - SAT 3500A- according to the instructions in the - Petrol/diesel exhaust gas analysis set .

When the equipment has finished calibration then it is prepared to complete the opacity test on the vehicle.

• Fit the probe -1- at least 15 cm into the exhaust pipe and secure with a clamp -2- to the pipe wall so that it is not expelled by the vibrations.

• Once this operation has been completed, accelerate energetically but gently bringing the engine to its maximum flow.
• Hold this position for at least two seconds.

The screen will display the maximum opacity reached by the exhaust gases and record this in the MAX field. The field KM-1 indicates the instantaneous opacity which varies according to engine speed.

If the value is within the permitted limits and does not exceed the maximum contamination value previously indicated then the vehicle may be considered approved.

Official test (free acceleration)

According to the message on the screen, two accelerations must be done to clean the exhaust tube before connecting the probe.

Once this is done, press a function key Q to cancel the message.

• Calibrate the exhaust gas analyser - SAT 3500A- according to the instructions in the - Petrol/diesel exhaust gas analysis set .

When the equipment has finished calibration then it is prepared to complete the opacity test on the vehicle.

• Fit the probe at least 15 cm down into the exhaust pipe and secure with the clamp to the pipe wall so that it is not expelled by the vibrations.

If RESET is pressed the screen displayed will be similar to the following table:

8) The button A can be used to change the type of vehicle to be tested; atmospheric engines A or supercharged engines B . This function is valid so that the machine selects the maximum comparison value.

Once the test has started and the button RESET has been selected using the function key Q , take the following steps:

Acceleration

The engine is accelerated energetically and progressively but not suddenly until the maximum flow of the injector pump.

Hold this

Attempt to maintain a constant engine speed while the screen is displaying information.

Deceleration

Release the accelerator for the deceleration duration. The test value is recorded in the corresponding field according to the test being done.

Now the test 2 is done, repeating the previous steps (acceleration, hold and deceleration). This process may be repeated up to eight times as necessary.

If the values obtained during the first four tests are within the margins and do not exceed the permitted contamination levels then these are considered to be correct.

If the difference between values is more than that permitted, the difference being more than (0.5 m-1) between the largest and smallest value, up to eight tests may be repeated while four consecutive tests are not within limits.

If incorrect values are obtained, then the vehicle will not be approved.

Any problems should be repaired.

If the value is within the permitted limits and does not exceed the maximum contamination value previously indicated then the vehicle may be considered approved.