System and method for determining a contamination level in an emissions measurement device or system

An emissions test system comprising:

• at least one emissions test system component;
• an emissions analyzer configured to determine a concentration of an emission in a sample of exhaust gas from an engine;
• a contamination index module configured to determine a contamination index for the at least one emission test system component based on at least two of:
• a flow rate of the exhaust gas sample weighted by at least one of a first weighting factor and a first exponent associated with the emission test system component;
• the concentration of the emission in the exhaust gas sample weighted by at least one of a second weighting factor and a second exponent associated with the emission test system component;
• an operating duration of the emissions test system weighted by at least one of a third weighting factor and a third exponent associated with the emission test system component;
• a pressure of the exhaust gas weighted by at least one of a fourth weighting factor and a fourth exponent associated with the emission test system component;
• or
• a temperature of the exhaust gas weighted by at least one of a fifth weighting factor and a fifth exponent associated with the emission test system component;
• and
• a diagnostic module configured to identify potential contamination of the at least one emissions test system component based on the contamination index.