What are the precautions to be followed for engine RPM measurement while doing the free acceleration test ?
A.The clamp-on sensor supplied with the smoke meter is suitable for diesel vehicles having fuel pipe diameter in the range 5.9-6.35 mm. Smoke meter manufacturers shall supply a gauge along with the smoke meter to enable the operator to ascertain before-hand about the fitment of RPM sensor to fuel pipe without damaging the sensor. For models in the field whose diameter is outside this range, the above sensor should not be used. For such models, a magnetic di-speed RPM sensor or a clamp-on sensor with suitable diameter may be used as an alternative, if there is a problem. In case of clamp-on sensor, PUC operator should ensure that the fuel injection pipe is clean and mount the sensor on available straight portion of the pipe.
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