SCHS-3

Compact heated sample conditioning for real-time natural gas analyzer protection.

The Welker SCHS-3 is a compact multi-stage heated pressure and temperature conditioning system designed to protect natural gas analyzers from free liquids, condensate, and phase change before analysis. Built for gas analytical systems in pipelines and laboratories, the SCHS-3 combines a pitot-style probe, liquid coalescer, filtration barrier, low internal gas volume, multi-stage heating and regulation, and sample outlet pressure and temperature indication to support real-time natural gas sampling. By reducing stagnant inlet gas, condensate flashing, cooling from pressure drop, and supply pressure effect, the SCHS-3 helps maintain consistent outlet pressure while protecting gas chromatographs and analyzers from costly liquid damage.

Where to Use

Natural Gas Analyzer Protection

Upstream of an analyzer to protect gas chromatographs and analytical equipment from free liquids in natural gas sampling systems.

Natural Gas Pipelines

Pipeline-mounted sample conditioning where pressure, temperature, and liquid protection are needed for real-time gas analysis.

Laboratories

Lab-based gas analytical systems requiring compact heated conditioning before analyzer entry.

Resources

SCHS-3 IOM SCHS-3 Data Sheet

Pitot-Style Probe Design

Self-generates sample flow to reduce stagnant inlet gas and improve real-time natural gas sampling.

Liquid Coalescer and Filtration Barrier

Helps remove free liquids and contaminants while reducing liquid barrier saturation before the sample reaches the analyzer.

Low Internal Gas Volume

Reduces sample lag time to support faster, more responsive online gas analysis.

Multi-Stage Heating and Regulation

Maintains inlet gas temperature, reduces phase change, limits condensate flashing, and helps reduce cooling caused by pressure drop.

Sample Gas Outlet Pressure and Temperature Indicators

Provides quick visibility into outlet conditions so operators can confirm the sample is properly conditioned before analyzer entry.

Optional Liquid Shutoff Valve

Provides emergency shutoff prior to the analyzer when liquid is detected, helping prevent costly analyzer damage.

Compact Footprint

Supports easier installation in analyzer shelters, laboratories, and space-constrained gas sampling systems.

	SCHS-3
Materials of Construction	316/316L Stainless Steel and 304 Stainless Steel, Anodized Aluminum
Seal Material	FKM
Operating Temperature	Ambient -50 °F to 120 °F (-45 °C to 48 °C ) Process 32 °F to 300 °F (0 °C to 148 °C)
Maximum Inlet Pressure	3600 psig (248.21 barg)
Power Requirements	80 W @ AC 110/220 V
Power Requirements	25 W @ DC 24 V
Sample Outlet	&frac18;" Tubing
Probe Length	Standard for 2" and 3" Pipe
	Standard for 4" and 6" Pipe
	Standard for 8", 10", and 12" Pipe
	Standard for 14", 16", and 18" Pipe
Pipeline Connection	½" MNPT
	¾" MNPT
	1" MNPT
	2" – Class 300 RF
	2" – Class 600 RF
Regulator Output Range	0–50 psig (0–3.44 barg)
	0–100 psig (0–6.89 barg)
	0–200 psig (0–13.78 barg)
Electrical Connection	½" FNPT
Flow Coefficient	(Cv) 0.001
Industry Standards	CSA Class I, Div. 1, Groups B, C, and D, T3 / ATEX II 2 G Ex d IIC T3, IP68

SCHS-3

Where to Use

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