The GSS-4 Vanishing Chambers Sampler features Welker's unique collection head. its design allows Welker gas samplers to PUMP the product into the collection cylinder, regardless of pipeline pressure.

Open
Product fills the chamber in the collection head

VOIDED
The collection head is pressed against the opposing flat surface.
The chamber in the collection head vanishes "pumping" product past the
inline relief and into the sample cylinder. The inline relief isolates
the collected sample from the pipeline

Because sampling conditions vary from one application to another, Welker offers two styles of inline reliefs for the GSS-4.

EXTERNALLY ADJUSTABLE INLINE RELIEF - serves the same purpose as the standard inline relief, but may be adjusted if needed while the sampler is in operation.
BALANCED INLINE RELIEF - for sampling from pipelines with widely varying pressures. This relief is tied directly to pipeline pressure and automatically compensates for variations.

The GSS-4 Vanishing Chamber Sampler sets new standards in versatility and accuracy. Welker samplers perform.