A gas supply unit for an exhaust gas analysis unit for measurement of exhaust gas of an internal combustion engine

摘要

A calibration gas line 30 (32; 34), a purge gas line 26 and thereby a fluid connection to the measurement unit 18 can be formed, which has a measurement unit 18 for analysis of the sample gas (22) having a sample gas line (13) open to a common connection line (20) and having a calibration gas line (30; 32; 34), a purge gas line , Sample gas flow, calibration gas flow, and purge gas flow are selectively shut off or released, wherein the sample gas flow, the calibration gas flow, (10) for measuring the exhaust gas of an internal combustion engine, the exhaust gas analyzing unit (10) having a pump (16) for discharging the exhaust gas. According to the present invention, the sample gas line 13 is connected to each measurement unit 18 and the calibration gas line (not shown) so that the exhaust gas analysis unit can be operated even in the case of very small perfusion and short reaction times while performing highly accurate measurements. 30 and the purge gas line 26 and the outlet nozzle 42 is disposed at the opposite end of the connecting line 20 with respect to the measuring unit 18, An outflow line 48 branches off from the connection line 20 and an outflow nozzle 50 and a shutoff valve 52 are disposed in the outflow line.