Composite Gas Sampler


Data Sheet:GSS-4PM Data Sheet

The Welker® GSS-4PM Composite Gas Sampler extracts a sample from the flowing product in the pipeline and uses positive displacement to capture a representative sample.

Location matters

Center One-Third

Placing the sample probe in the center 1/3 of the pipeline is a significant factor in gathering a representative sample. Avoid placing the sampler in turbulent spots such as pipe elbows and traps. We can help you find the best installation point for your sampler. We can even install it for you. Just give us a call.


Collection Cup

Vanishing Chamber™

The Vanishing Chamber™ collection cup utilizes positive displacement to capture and push the complete sample to the sample container.


Purging System

Fresh Sample

The unique self-purging system ensures a fresh sample with every actuation.



Materials of Construction 316/316L Stainless Steel
Seal Material Viton®
Pipeline Connection 3/4" MNPT
Outlet Connection 1/4" FNPT
Collection Cup Viton® Vanishing Chamber
Relief Type Inline Relief
Insertion Length 8"
Sample Volume 0.22 cc
Bypass Integrated Bypass Manifold with Built-in Valve
Operation Diaphragm-Operated Pump
Operating Pressure 2160 psig MAOP @ -20 °F to 120 °F
Industry Standards Complies with API 14.1, GPA 2166, and ISO 10715