Model Series
LGSSLiquefied Gas Sampling System (Includes 600# ANSI Sight Flow Indicator)
VSSVapor (Gas) Sampling System (Optimized for gaseous process streams)
Product page
SOR
SOR SENSOR Cylinder Sampling Systems (LGSS & VSS Series)
The SENSOR Liquefied Gas Sampling System (LGSS) and Vapor Sampling System (VSS) from SOR Controls Group are engineered for safe, emission-free closed-loop 'grab' sampling of high vapor pressure liquids, liquefied petroleum gases (LPGs), process vapors, and refinery gases directly into sample cylinders. Operating under continuous fast-loop flow via a process bypass or parallel line off the main pipeline, the system ensures fresh, representative samples without process lag time. The LGSS incorporates an integral 600# ANSI sight flow indicator with a physical flapper/rotor, providing operators with direct visual verification of cylinder filling and safe vapor space outage before disconnection. Built with a single 4-way sampling valve for foolproof operation, the system allows full depressurization and venting of quick-connect fittings prior to cylinder removal, eliminating toxic fugitive emissions and safeguarding personnel. Designed for operating pressures up to 1,440 psig (99.3 bar / 2,000 psig max @ 70 °F) and process temperatures to 350 °F (177 °C), systems can be customized with sample coolers, heat-traced insulated enclosures, SilcoNert internal inert coatings, and exotic alloys (Hastelloy C-276, Monel 400).
Safe, zero-emission closed-loop grab sampling for LPGs, liquefied hydrocarbons, and toxic process gases
Single 4-way sampling valve operation simplifies sampling procedure and eliminates operator sequencing errors
Integral 600# ANSI sight flow level indicator provides direct visual confirmation of flow and safe cylinder outage
Quick-connect vent and depressurization system ensures zero pressure discharge when removing the cylinder
Ready for quotationShare your range, connection and case requirement.
Talk to ATHSampling System ModelsLGSS (Liquefied Gas Sampling) | VSS (Vapor / Gas Sampling)
Operating Pressure1,440 psig (99.3 bar) standard | 2,000 psig max @ 70 °F (138 bar) | HP Systems >1,400 psig
Operating TemperatureUp to 350 °F (177 °C) standard [Process Coolers recommended for >135 °F / 57 °C]
Process Connections1/4" Tube (standard), 3/8" Tube, 3/4" Tube, or Flanged ANSI 150# to 600# RF
Sample Cylinder Sizes150 cc, 300 cc (standard), 500 cc, 1,000 cc with double-ended shutoff quick connects
Sight Flow Indicator600# ANSI stainless steel with internal visual flow flapper (LGSS model)
Wetted Metallurgy316SS tubing & fittings / 316LSS valves (Monel 400 & Hastelloy C-276 optional)
Elastomeric O-RingsViton standard; Kalrez optional for aggressive H2S and sour gas service
Valve Stem PackingTeflon standard; Grafoil for high-temperature applications
Mounting Backplate304 Stainless Steel plate with non-metallic cylinder mounting clamp (optional 2" pipe stand)
Emissions TreatmentFlare header return or Activated Carbon filter canister with saturation crystals
Quality & CompliancePED 2014/68/EU Compliant | ASME B31.3 Design | 1-Year Factory Warranty
Technical Specifications & Selection Guide
SOR SENSOR LGSS & VSS Cylinder Sampling Systems Technical Reference
Configure your closed-loop cylinder sampling system by selecting system type (LGSS for liquefied gas / VSS for process vapor), sample cylinder volume, connection size, and process safety accessories.
Pressure Rating1,440 psig (99.3 bar) standard
TemperatureUp to 350 °F (177 °C)
Cylinder Sizes150cc, 300cc, 500cc, 1000cc
Wetted Materials316/316LSS, Monel, Hastelloy
Sample Cylinder Size
15150 cc Sample Cylinder Capacity
30300 cc Sample Cylinder Capacity (Standard Industrial Size)
50500 cc Sample Cylinder Capacity
1K1,000 cc (1 Liter) Sample Cylinder Capacity
Process Inlet & Outlet Connections
251/4" OD Tube Fitting Connections (Standard)
373/8" OD Tube Fitting Connections
753/4" OD Tube Fitting Connections
FFFlanged Process Connections (ANSI 150#, 300#, 600# RF)
System Options & Safety Accessories
IBInlet & Outlet Process Isolation Ball Valves (316SS)
KZKalrez Elastomer O-Rings (Recommended for H2S and sour service)
CY316SS Sample Cylinder with Double-Ended Shutoff Quick Connects
DTInternal Cylinder Outage Dip Tube (Available on LGSS)
PCProcess Sample Cooler (Exchanger for streams >135 °F / 57 °C)
SPSystem Purge Assembly (Regulator, Rotameter, Gauge, Check & Block Valve)
CCActivated Carbon Emissions Filter Canister with Indicating Crystals
CFStandard Activated Carbon Emissions Filter Canister
RDSample Cylinder Rupture Disc Assembly
SLSilcoNert 2000 Inert Surface Coating for Trace Sulfur Analysis
PS2" x 60" Galvanized Pipe Stand with Mounting Floor Base
HPHigh Pressure System (>1,400 psig) with Reflex Sight Glass
EIInsulated Weatherproof Enclosure
EEInsulated Enclosure with Explosion-Proof Electric Space Heater
ESInsulated Enclosure with Steam Heating Coil
Model Number Architecture
LGSS-30-75-IB/KZ
LGSSSystem TypeLiquefied Gas Sampling System
30Cylinder Size300 cc Sample Cylinder
75Connection3/4" OD Tube Fitting Connections
IB/KZOptionsIsolation Valves + Kalrez O-Rings
Technical specifications
Working Pressure1,440 psig standard | 2,000 psig @ 70 °F max | HP >1,400 psig
Operating TemperatureUp to 350 °F (177 °C) standard [Coolers available for >135 °F]
Sight Flow Indicator600# ANSI 316SS with visual rotor/flapper (LGSS)
Sample ValveSingle 4-Way Multiport Sampling Valve in 316LSS
Quick ConnectsDouble-ended shutoff quick disconnects in 316SS
Mounting Panel304 Stainless Steel backplate with non-metallic cylinder bracket
Optional Cylinder Metallurgy316SS DOT/TC rated; optional Monel 400 or Hastelloy C-276
WeightApprox. 28 to 45 lb (13 to 20 kg) depending on options
Design CodesASME B31.3 Chemical Plant and Petroleum Refinery Piping
Warranty1-Year SOR Controls Group Limited Warranty
Operational & Maintenance Guidelines
Ensure fast loop inlet is connected to the high-pressure tap and outlet returns to a lower-pressure process line point.
For liquefied gas sampling, visually monitor the sight glass until full flow is established, then expand cylinder outage.
Depressurize quick connects to flare or vent canister prior to uncoupling sample cylinder.
Inspect Viton/Kalrez O-rings and quick-connect seals periodically; replace at first sign of wear or chemical degradation.
Closed-Loop Closed-System Sampling Architecture
Industrial grab sampling of volatile hydrocarbons, liquefied petroleum gases, and toxic vapors requires stringent environmental and operator safeguards. The SENSOR LGSS and VSS systems from SOR provide a continuous bypass loop off the main process line that circulates fresh product across a proprietary 4-way multiport sampling valve.
When the operator rotates the single valve handle from 'Bypass/Off' to 'Sample', process fluid fills the sample cylinder from bottom to top. For liquefied gases (LGSS), the fluid exits the top of the cylinder through an integral 600# ANSI sight glass back to the low-pressure process return. When liquid flow is observed in the sight glass, the operator turns the handle to 'Off' and opens the expansion outage valve, ensuring the cylinder retains the required 20% vapor space for safe thermal expansion during transport to the laboratory.
Continuous bypass circulation eliminates sample lag time and guarantees that fluid collected is fully representative
Single-handle 4-way valve eliminates multi-valve manifold sequencing errors and accidental releases
Complete depressurization of the sample cylinder quick connects to flare or carbon canister prior to disconnect
Proprietary SENSOR orientation bracket ensures sample cylinders cannot be connected upside down
Sight glass visual indicator eliminates overfilling and dangerous hydrostatic overpressurization of cylinders
Model Selection: LGSS vs. VSS
LGSS (Liquefied Gas)Optimized for LPG, propane, butane, ethylene, and high vapor-pressure liquids requiring outage control
VSS (Vapor & Process Gas)Designed for dry or wet process gases, flare headers, hydrogen, and natural gas streams into sample cylinders
HP High-Pressure SystemsIncludes reflex heavy-duty sight glass and extended operator handle for pressures exceeding 1,400 psig
Sample Cooler OptionProcess heat exchangers for hot streams (>135 °F / 57 °C) to prevent flashing and protect operator
Enclosure ConfigurationsNEMA 4X fiberglass/stainless steel enclosures with steam heating (ES) or electric explosion-proof heating (EE)
Ordering Configuration Matrix
1. Model TypeLGSS (Liquefied Gas Sampling System) | VSS (Vapor Gas Sampling System)
2. Cylinder Size15 (150cc) | 30 (300cc standard) | 50 (500cc) | 1K (1000cc) | XX (Special)
3. Process Connection25 (1/4" Tube standard) | 37 (3/8" Tube) | 75 (3/4" Tube) | FF (Flanged specified size/rating)
4. System OptionsAR (Rotameter), CC (Carbon w/ Crystals), CF (Carbon Canister), CY (Cylinder), DT (Dip Tube), IB (Isolation Valves), KZ (Kalrez), PC (Cooler), PS (Pipe Stand), RD (Rupture Disc), SL (SilcoNert), SP (Purge)
Engineering & Safety Considerations
In closed-loop grab sampling, safety depends on maintaining containment during both collection and cylinder transport. SENSOR sampling cylinders can be furnished with internal outage dip tubes, spring relief valves, or rupture discs calibrated to DOT/TC transport specifications.
Where process vent-to-flare connections are unavailable, SENSOR provides activated carbon canisters with color-indicating chemical crystals that turn from purple to brown upon saturation, providing clear visual notice when adsorption media requires replenishment.
Optional SilcoNert 2000 internal passivation coating prevents adsorption of trace sulfur (H2S, mercaptans) and mercury
Isolation block valves (IB) on inlet and outlet allow complete offline maintenance without shutting down the bypass line
Galvanized or 304SS 2" x 60" pipe stand with mounting base plate allows standalone field installation near sample taps