Exhaust gas sample taking system

An exhaust gas sampling system comprising:

• a conveying line;
• a throughput pump which is configured to convey a sample gas in the conveying line;
• a first Venturi nozzle;
• a second Venturi nozzle;
• a first control valve;
• and
• a second control valve,
• wherein,
• the first Venturi nozzle and the second Venturi nozzle are connected in parallel and are arranged in the conveying line upstream of the throughput pump,
• the first Venturi nozzle is assigned the first control valve,
• the second Venturi nozzle is assigned the second control valve,
• each of the first control valve and the second control valve are provided as a pinch valve, each pinch valve comprising a flexible, hose-like control element and a pressure chamber which is configured to be filled with a fluid and which is arranged to surround the flexible, hose-like control element,
• each pinch valve is a pneumatic pinch valve,
• the pressure chamber of each of the first control valve and the second control valve is in fluid communication with a respective compressed air line, and
• each compressed air line comprises a pressure switch which is configured to determine a switch position of the respective first control valve and second control valve.