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GSS-4PM Composite Gas Sampling System

Brand: Welker, Inc
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.

Unique Collection Head

The GSS-4PM’s claim to fame is the Vanishing Chamber™ collection cup. This compressible collection cup captures set volumes of sample. Each actuation of the sample pump voids the collection cup, fully displacing the sample into the connected sample cylinder. Made from resilient material, the Vanishing Chamber™ bounces back to provide repeatable results actuation after actuation.

Eliminate Lag Time

Mounted on a Welker Sample Probe, the GSS-4PM installs directly to the pipeline. There are no long tubing runs to impact sample timeliness and representativeness. Extending into the center one-third of your pipeline, the GSS-4PM captures samples representative of the flowing stream and leaves free liquids behind.

Optional Integrated Purge Manifold

For wet gas sampling applications, swap the standard Welker Sample Probe for a Welker LE-2SSKO. The patented design of our probe-mounted liquid eliminator effectively knocks free liquids out of the sample stream and returns them to the pipeline.

Collect Representative Samples

The GSS-4PM features Welker’s Fresh Sample System™. This self-purging design ensures a fresh, representative sample grab during each sample cycle.

Integrated Purge Manifold

Don’t let residual impurities distort your sample. Air or previous samples can impact sample accuracy if not properly removed. Purge your sample cylinder before each collection period as recommended using the GSS-4PM’s integrated purge manifold.
Features
Backflow Protection

The inline relief protects sample representativeness during fluctuations in pipeline pressure. Acting as a check valve, the inline relief keeps your samples in the sample cylinder. If pipeline pressure drops, rest assured sample won’t flow from your cylinder back to the pipeline.

Cylinder Holders Included

No need to add a cylinder holder to your order—each GSS-4PM comes standard with a manifold for a single cavity cylinder and a bracket with mounting hardware for a constant pressure cylinder. The manifold keeps your single cavity cylinder vertical for proper filling and purging. The bracket provides the horizontal support your constant pressure cylinder requires and keeps it close for short tubing connections.
  • Designed to collect a representative composite sample
  • Vanishing Chamber™ collection cup
  • Self-purging system
  • Actuated by regulated pipeline pressure or auxiliary pneumatic supply
Benefits
  • 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
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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.

Unique Collection Head

The GSS-4PM’s claim to fame is the Vanishing Chamber™ collection cup. This compressible collection cup captures set volumes of sample. Each actuation of the sample pump voids the collection cup, fully displacing the sample into the connected sample cylinder. Made from resilient material, the Vanishing Chamber™ bounces back to provide repeatable results actuation after actuation.

Eliminate Lag Time

Mounted on a Welker Sample Probe, the GSS-4PM installs directly to the pipeline. There are no long tubing runs to impact sample timeliness and representativeness. Extending into the center one-third of your pipeline, the GSS-4PM captures samples representative of the flowing stream and leaves free liquids behind.

Optional Integrated Purge Manifold

For wet gas sampling applications, swap the standard Welker Sample Probe for a Welker LE-2SSKO. The patented design of our probe-mounted liquid eliminator effectively knocks free liquids out of the sample stream and returns them to the pipeline.

Collect Representative Samples

The GSS-4PM features Welker’s Fresh Sample System™. This self-purging design ensures a fresh, representative sample grab during each sample cycle.

Integrated Purge Manifold

Don’t let residual impurities distort your sample. Air or previous samples can impact sample accuracy if not properly removed. Purge your sample cylinder before each collection period as recommended using the GSS-4PM’s integrated purge manifold.
Features
Backflow Protection

The inline relief protects sample representativeness during fluctuations in pipeline pressure. Acting as a check valve, the inline relief keeps your samples in the sample cylinder. If pipeline pressure drops, rest assured sample won’t flow from your cylinder back to the pipeline.

Cylinder Holders Included

No need to add a cylinder holder to your order—each GSS-4PM comes standard with a manifold for a single cavity cylinder and a bracket with mounting hardware for a constant pressure cylinder. The manifold keeps your single cavity cylinder vertical for proper filling and purging. The bracket provides the horizontal support your constant pressure cylinder requires and keeps it close for short tubing connections.
  • Designed to collect a representative composite sample
  • Vanishing Chamber™ collection cup
  • Self-purging system
  • Actuated by regulated pipeline pressure or auxiliary pneumatic supply
Benefits
  • 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

Specifications

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

  • API 14.1
  • GPA 2166
  • ISO 10715

Typical Applications

  • Composite Sampling Of Natural Gas