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Where to Use

  • Composite Sampling of Natural Gas
Sample API 14.1 GPA 2166 ISO 10715    

No autographs, please. The unrivaled accuracy of Welker’s GSS-4PM Gas Sampling System is world-famous. Its unparalleled decades-long history of representative sampling, repeatability, and accuracy have made the GSS-4PM the composite sampling system for natural gas—wet or dry, clean or dirty.

Probe-mounted and self-purging, the GSS-4PM is a self-contained system compatible with single cavity and constant pressure cylinders. With the Vanishing Chamber™ collection cup at the heart of the positive displacement pump, there’s no doubt your samples will be as representative and accurate as the results of an online analyzer.


  • Designed to collect a representative composite sample
  • Vanishing Chamber™ collection cup
  • Self-purging system
  • Actuated by regulated pipeline pressure or auxiliary pneumatic supply


  • Sampling directly from the flowing product allows for a truly representative sample
  • Sampler design has minimal interference between the pipeline and sample pathway
  • The Vanishing Chamber™ collection cup utilizes positive displacement to capture and push the complete sample to the sample container
  • The unique self-purging system ensures a fresh sample with every actuation
  • Easy to install
More Information
Product Category : Natural Gas Sampling
Composite Sampler
Materials of Construction : 316/316L Stainless Steel, PTFE, and FKM
Maximum Allowable Operating Pressure : 2160 psig @ -20 °F to 120 °F
Seal : FKM
Electronics : Solenoid Only
Outlet Connection : ¼" FNPT
Pipeline Connection : ¾" MNPT
Insertion Length : 8"
Operation : Diaphragm-Operated
Collection Head : .22 cc FKM
Accessories : 2000 psig Gauge
Industry Standards : Complies with GPA 2166, API 14.1, ASTM D5287, IS0 10715
Weight : 21 lb

Weight and/or dimensions are approximate.

Specifications subject to change without notice.

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