LB Series In-Line Liquid Samplers
Back Purge & Venturi Assisted Liquid Sampling Systems
Spirare Energy's LB Series In-Line Liquid Samplers are engineered for demanding closed-loop sampling applications requiring reverse flow purging, vacuum evacuation, or venturi-assisted fluid extraction. Designed for media having very low pressure, the LB Series operates at process pressures below 8 Bar.g and vapor pressures below 0.7 Bar.g, equipped with specialized eductors and vacuum connections to reliably draw low-pressure or vacuum liquids into the septum bottle while clearing all internal passages post-sampling.
The system integrates inert gas (Nitrogen) manifolds with pressure regulators, check valves, and geared or spring-return deadman handles. By driving inert gas in reverse through the process inlet, the LB Series flushes any residual media back into the process stream, eliminates toxic exposure during bottle disconnection, and prevents sample cross-contamination.
Available in six distinct configurations (LB1 through LB6)—including vacuum connection, venturi eductor, dual needle purge, overflow, and fixed-volume variants—the LB Series offers uncompromised safety and compliance for refineries, petrochemical plants, specialty chemical units, and offshore facilities.
Sampler Specifications & Models
Explore complete technical specifications, available options, and the six specialized LB Series back-purge and venturi configurations engineered for closed-loop sampling.
Sampler Specifications
Design LimitsOperating Pressure
Very Low Pressure / Vacuum Liquids — Below 8 Bar.g (Standard)
Suitable for very low pressure or vacuum media. Eductors and vacuum units enable sampling from near-atmospheric or negative pressure lines.
Vapor Pressure
Below 0.7 Bar.g (10 psig)
Engineered for liquid media having vapor pressure below 0.7 Bar.g. Eductor collection prevents fluid boiling during draw.
Material of Construction (MOC)
SS 316 / SS 316L (Standard)
Standard SS 316/316L. Exotic options: Hastelloy C-276, Monel 400, Duplex, Super Duplex, Inconel 625, PTFE-lined valves.
Process Connections
1/4" OD, NPT, Flange (Standard)
Available in compression tube fittings, female NPT, or ANSI Class 150/300/600/DIN flanged connections. Options: 3/8", 1/2".
Sleeve & Retainer Assembly
100CC, 150CC, 250CC, 500CC, 1000CC
Heavy-duty protective sleeve with vertical viewing slot, positive bottle retention, and needle guide shroud.
Sample Bottle Sizes & Types
100 cc, 150 cc, 250 cc, 500 cc, 600 cc etc.
Borosilicate glass laboratory bottles with PTFE/elastomer septum caps and plastic shatter-guard coatings.
Options Available & Custom Accessories
Mounting Plate & Enclosure Cabinets
SS 304/316 mounting plate, weather-proof IP protective cabinet with lockable door and viewing window.
Spring Return Handle & Geared Valves
Fail-safe spring return handle or geared multi-port sequencing valve that isolates lines when released.
Floor / Pipe Stand Assembly
2" NB stanchion pipe Mounting Stand in carbon steel (galvanized/powder-coated) or SS 304/316.
Integrated Venturi Eductor Unit
Nitrogen-driven eductor that generates suction vacuum for drawing low-pressure process liquids.
Automatic Sampling Options
Pneumatic or electric actuators with sequence timer controller for automated remote back-purge sampling.
Nitrogen (N2) Regulation Station
Inert gas motive fluid manifold with pressure indicators (PI), check valves, and precision pressure regulators.
Back Purge Liquid Sampling (LB1 – LB6)
Select an engineered back-purge configuration based on your vacuum header availability, venturi eductor requirements, and volumetric metering needs.
Back Purge with Vacuum Connection
Engineered with an external vacuum connection to suction the sample into the bottle and draw low-pressure liquids smoothly, coupled with reverse inert gas flushing to push residual media back into the process line.
Custom engineered skids available on request
| Model | System Type & Description | Purging / Extraction Mode | Action |
|---|---|---|---|
| LB1 | Back Purge with Vacuum Connection Engineered with an external vacuum connection to suction the sample into the bottle and draw low-pressure liquids smoothly, coupled with reverse inert gas flushing to push residual media back into the process line. | Vacuum Assisted Back-Purge Sampling External Vacuum Draw + Inert N2 Reverse Back-Purge | |
| LB2 | Back and Needle Purge with Vacuum Connection Combines external vacuum assist with dual-action purging—simultaneously clearing the sample takeoff line via reverse flow and purging the dispensing needles with inert gas to prevent droplet contamination. | Dual Back & Needle Purge + Vacuum Vacuum Extraction + Simultaneous Line Back-Purge & N2 Needle Purge | |
| LB3 | Back Purge Type with Venturi Unit Features an integrated venturi eductor powered by motive Nitrogen gas to generate a strong localized vacuum, drawing representative samples from low-pressure tanks without external vacuum headers. | Self-Contained Venturi Eductor Sampling Motive N2 Venturi Eductor Draw + Process Back-Flush | |
| LB4 | Back and Needle Purge Type with Venturi Unit Comprehensive self-contained sampling station integrating motive Nitrogen venturi vacuum extraction with dual back-purging and needle flushing for maximum containment and reliability. | Venturi Eductor + Dual Back & Needle Purge N2 Motive Venturi Vacuum + Dual Line Back-Purge & Needle Flushing | |
| LB5 | Overflow Type with Vacuum Connection Maintains continuous liquid overflow through the sampling assembly under vacuum assistance to guarantee 100% fresh, non-stagnant process fluid at the moment of septum bottle filling. | Continuous Overflow Circulation + Vacuum Continuous Vacuum Overflow Loop with Inert Header Routing | |
| LB6 | Back Purge with Fixed Volume Type Combines an isolated volumetric chamber with reverse back-purge functionality to collect an exact pre-metered sample volume while safeguarding the operator from line over-pressurization. | Fixed Volume Calibrated Chamber + Back-Purge Fixed Volume Chamber + Reverse N2 Back-Purge Flushing |
PROCESS APPLICATION CONFIGURATOR
Select your desired application to configure the ideal engineering pathway and receive a tailored quotation.