Common use of Analyser response Clause in Contracts

Analyser response. At the start of the engine the measuring equipment shall be started, simultaneously: (a) Start collecting or analysing dilution air, if a full flow dilution system is used; (b) Start collecting or analysing raw or diluted exhaust gas, depending on the method used; (c) Start measuring the amount of diluted exhaust gas and the required temperatures and pressures; (d) Start recording the exhaust gas mass flow rate, if raw exhaust gas analysis is used; (e) Start recording the feedback data of speed and torque of the dynamometer. If raw exhaust measurement is used, the emission concentrations (HC, CO and NOx) and the exhaust gas mass flow rate shall be measured continuously and stored with at least 2 Hz on a computer system. All other data may be recorded with a sample rate of at least 1 Hz. For analogue analysers the response shall be recorded, and the calibration data may be applied online or offline during the data evaluation. If a full flow dilution system is used, HC and NOx shall be measured continuously in the dilution tunnel with a frequency of at least 2 Hz. The average concentrations shall be determined by integrating the analyser signals over the test cycle. The system response time shall be no greater than 20 s, and shall be coordinated with CVS flow fluctuations and sampling time/test cycle offsets, if necessary. CO and CO2 shall be determined by integration or by analysing the concentrations in the sample bag collected over the cycle. The concentrations of the gaseous pollutants in the dilution air shall be determined by integration or by collection in the background bag. All other parameters that need to be measured shall be recorded with a minimum of one measurement per second (1 Hz).