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281.491.2331 13839 West Bellfort Street Sugar Land, Texas
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Mole Sieve Probe

WELKER > Instrumentation > Probes > Mole Sieve Probe

Where to Use

  • Natural Gas Processing: In Molecular Sieve Adsorption Beds Upstream of Moisture and/or Mercury Analyzers

  • LNG Trains: In Molecular Sieve Adsorption Beds Upstream of Moisture and/or Mercury Analyzers

Mole Sieve Probe

Moisture Messenger

Prevent moisture or mercury from damaging downstream equipment and shutting down your process–detect breakthrough in your molecular sieve adsorbent bed by sampling the gas stream with Welker’s Molecular Sieve Probe.

The Molecular Sieve Probe mounts directly to a mating flange on the bed and extends across the inner diameter of your dehydration unit (DHU) or mercury removal unit (MRU) to sample natural gas from the full width of the bed. The water or mercury content of the samples is monitored by the connected downstream analyzer to alert the operator of rising levels and the need for molecular sieve regeneration.

Multiple Molecular Sieve Probes can be installed in a DHU or MRU in a multilevel configuration to monitor molecular sieve deactivation across the height of the bed.

The Right Stuff

Corrosion-Resistant Material

The production of natural gas for injection into the natural gas grid or for liquefaction for storage or transport as liquefied natural gas (LNG) requires several processes to remove contaminants like water and mercury to prevent them from compromising product quality, damaging process equipment, and posing a health and safety risk.

To withstand these demanding processes and the effects of these contaminants, the Molecular Sieve Probe is made of 316/316L stainless steel. Thanks to the metallurgical properties of this dual grade stainless steel, corrosion, absorption, adsorption, and chemical reactivity are minimized.

Mole Sieve Probe
Mole Sieve Probe
Royal (Surface) Treatment

Protective Barriers

Preserve your sample integrity and your probe! All internal and external wetted stainless-steel surfaces of the Molecular Sieve Probe are electropolished and coated with Dursan® to guard against sulfur absorption and corrosion. For probes used in MRUs, Sulfinert® coating provides additional protection against mercury.

Put the Block on Particulates

Filtering Probe Overlay

Surrounding the probe is a Johnson Screen Vee-Wire® filter element. This non-clogging filter prevents particulates and molecular sieves from entering the sample pathway and damaging the downstream analyzer while allowing the Molecular Sieve Probe to collect a representative sample.

Johnson Screen


Mole Sieve Probe
Mole Sieve Probe
Materials of Construction316/316L Stainless Steel
Process Connection2" – 600 ANSI RF
2" – 1500 ANSI RF
Others Available
Operating Pressure2" – 600 ANSI RF: 1480 psig @ -20 °F to 100 °F
2" – 1500 ANSI RF: 3600 psig @ -20 °F to 100 °F
FeaturesElectropolished Wetted Surfaces
Johnson Screen Vee-Wire® Filter Element
Manual or Actuated Closure Valves
NACE Compliance
Sulfinert® Coating on Wetted Parts
Multiple Joint Probe Configuration
Valve Orientation