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For both studies the composition of the mixture only at maximum engine load (e.g. calibration of
sequential autogas systems or fuel feed system equipped with a wideband oxygen sensor, where the air-
fuel ratio at low and partial engine load is controlled by the engine controller), when the exhaust gas
stream is strong, as well as the measurement at idle and at low engine loads when the ambient air might
disturb the measurement at low gas flow, shown in (Fig. 5) guide allows the correct test.
Figure 5. The guide positioned exhaust from the probe.
When making the guiding pipe remember that the probe wire harness should be routed beyond the hot
exhaust gas area.
When using a guiding pipe, it should not be placed in the exhaust gas stream until the engine
is initially warmed up. Large amounts of water vapour present in exhaust gases during start-up
and warming up of cold engine may damage the oxygen sensor.
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