BCT 960SN Sulfur and Nitrogen Compound Autosampler for High-Pressure Industrial Hydrocarbon Analysis

Overview

The BCT 960SN Sulfur and Nitrogen Compound Autosampler is a purpose-built, high-pressure liquid and vapor-phase sampling system engineered for precise, contamination-free introduction of challenging industrial hydrocarbon matrices into sulfur/nitrogen analyzers—particularly chemiluminescence detectors (SCD/NSD) and ultraviolet fluorescence (UVF) or thermal energy analyzers (TEA). Unlike conventional autosamplers relying on mass flow controllers (MFCs), the 960SN employs a pressure-driven, fixed-orifice flow control architecture based on calibrated restrictors and high-stability pressure regulation. This design eliminates MFC-related drift, gas-matrix dependency, and cross-contamination risks associated with sensor-based flow measurement—critical when analyzing trace-level sulfur and nitrogen species (e.g., thiophenes, mercaptans, pyridines, nitriles) in complex, high-boiling, or reactive streams such as BTX aromatics, light olefins (propylene, butadiene), and refinery gas condensates.

Key Features

• Matrix-Independent Flow Control: Utilizes precision-engineered restrictors paired with dual-stage, temperature-compensated pressure regulators to maintain consistent volumetric delivery across varying sample compositions—including H₂, C₁–C₄ hydrocarbons, and inert carrier gases—without recalibration.
• Dynamic On-Need Dilution: Enables real-time, programmable dilution ratios (up to 1:1000) without cryogenic traps, loop storage, or intermediate transfer vessels—minimizing adsorption losses for highly polar or reactive analytes including hydrogen sulfide, carbonyl sulfide, methyl mercaptan, formaldehyde, and formic acid.
• Full-Path Inertization: Entire fluidic path—from sample inlet valve through dilution manifold to outlet needle—is constructed from fused-silica-lined stainless steel tubing and coated with Sulfinert®-grade deactivated surface treatment. Verified via ASTM D5453 and ISO 20846 passivation protocols for <100 pg S/N recovery at sub-ppb levels.
• High-Pressure Compatibility: Rated for continuous operation up to 10 MPa (1450 psi), supporting direct injection of unvented refinery process streams and liquefied petroleum gas (LPG) samples without prior pressure reduction or phase separation.
• Modular Valve Architecture: Features six independently actuated, high-cycle-life PEEK- and Hastelloy-C276-sealed solenoid valves with integrated leak-tight sealing, enabling customizable sequence logic for multi-analyte, multi-dilution, or calibration standard injection routines.

Sample Compatibility & Compliance

The 960SN is validated for use with ASTM D5453 (ultraviolet fluorescence for total sulfur), ASTM D4294 (XRF), ASTM D7183 (oxidative combustion–chemiluminescence for total nitrogen), and ISO 20846 (motor gasoline sulfur analysis). Its inert flow path meets stringent requirements for GLP-compliant laboratories conducting method validation per ICH Q2(R2) and regulatory submissions under FDA 21 CFR Part 11. All wetted materials comply with USP Class VI biocompatibility standards and are certified free of extractables that interfere with low-level S/N detection.

Software & Data Management

Controlled via BCT’s proprietary AutoSamp Pro v3.2 software (Windows 10/11 compatible), the 960SN supports full audit trail logging—including user ID, timestamp, sequence parameters, pressure setpoints, dilution factors, and valve actuation events—with optional integration into LIMS platforms via ASTM E1578-compliant API. Software enforces electronic signatures, role-based access control, and automated report generation compliant with ISO/IEC 17025 clause 7.8. Data files are stored in vendor-neutral .csv and .xml formats, preserving raw pressure transducer readings and valve timing metadata for retrospective uncertainty analysis.

Applications

• Trace sulfur speciation in ethylene cracker feedstocks and polyolefin-grade propylene
• Total nitrogen quantification in reformulated gasoline and jet fuel per ASTM D3228
• Monitoring organic halides and reactive sulfur compounds in alkylation unit acid blowdown streams
• Method development for ultra-low-sulfur diesel (ULSD) certification testing (≤10 ppm S)
• QC/QA support for catalyst deactivation studies involving coke-bound nitrogen species

FAQ

Does the 960SN require external mass flow controllers or gas chromatography integration?
No. It operates autonomously using internal pressure regulation and restrictor-based flow control; GC integration is optional and implemented only via standard 1/16″ VCR interfaces.
Can it handle liquefied samples such as LPG or butane without phase change artifacts?
Yes. Its high-pressure rated sample loop and heated zone (up to 150 °C) maintain single-phase delivery during injection, preventing fractionation or condensation-induced bias.
Is firmware update capability available remotely?
Yes—via secure HTTPS-based OTA updates with cryptographic signature verification and rollback support.
What documentation is supplied for regulatory audits?
Factory calibration certificates, inertness test reports (per ASTM D7183 Annex A3), material compliance declarations, and full IQ/OQ protocol templates are included with each unit.