| 摘要 |
A gas sampling system particularly though not exclusively for alcohol breath testing, has a small suction pump including a diaphragm 16 connected by a passage 20 to one side 49 of a breath tube 10, the pump being arranged to draw the breath sample across the fuel cell 24. In addition there is a small bag 40 connected by the conduit 20 to a passage 48 on the other side of the breath tube. When the bag 40 expands it releases a latch 46 engaging a stud on a button 31 attached to the diaphragm 16. When the latch 46 is released the button is raised by the spring causing the diaphragm to draw in the breath sample. |
