Which precaution must be taken before calibrating the emission (exhaust) gas analyser? A Ensure that the engine is at operating temperature - NSC Mechanical Technology Automotive - Question 4 - 2022 - Paper 1

The correct precaution to take before calibrating the emission gas analyser is that the pick-up hose connections must be airtight. This is crucial because if the connections are not airtight, it could lead to inaccurate measurements of the exhaust gases, which would compromise the calibration process. Ensuring airtight connections helps maintain the integrity of the sampled gas and guarantees that the analyser functions correctly.