Pressure and temperature changes that occur during repeated fill and empty cycles have the potential to distort your sample. The SSM-1’s pigtail keeps your sample representative by distancing the flow restriction from the sample cylinder. Pressure reduction during an empty cycle occurs at the pigtail’s valve, preventing the Joule-Thomson effect from cooling the cylinder and potentially condensing the sampled gas. When using an SSM-1 with Welker Fluid Sentinel, the technician can visually monitor the sample stream for created liquids and modify the spot sampling technique as necessary.