Diaphragm-regulated capillary flow controller, sampling assembly, and methods for sampling

A sampling assembly, comprising:

• a diaphragm-regulated capillary flow controller including:
• a diaphragm-regulated flow controller;
• and
• a capillary flow controller connected to and in fluid communication with the diaphragm-regulated flow controller;
• and
• a sampling vessel having an inlet in fluid communication with the diaphragm-regulated flow controller through the capillary flow controller.

A method for sampling, comprising:

• disposing a sampling assembly in an air sampling location, the sampling assembly including:
• a diaphragm-regulated capillary flow controller including:
• a diaphragm-regulated flow controller;
• and
• a capillary flow controller connected to and in fluid communication with the diaphragm-regulated flow controller;
• and
• a sampling vessel having an inlet in fluid communication with the diaphragm-regulated flow controller through the capillary flow controller, the sampling vessel being evacuated;
• and
• setting a flow rate of the diaphragm-regulated capillary flow controller to a rate of up to about 0.5 mL/min;
• opening a valve blocking fluid communication of the sampling vessel with an atmosphere to be sampled;
• collecting a sample for a duration of more than one week;
• and
• closing the valve.