KY-200 Microcoulometric Sulfur Analyzer
| Brand | Keyuan Instruments |
|---|---|
| Origin | Jiangsu, China |
| Manufacturer Type | Direct Manufacturer |
| Country of Origin | China |
| Model | KY-200 Sulfur Analyzer |
| Price | USD 9,200 (FOB Jiangsu) |
Overview
The KY-200 Microcoulometric Sulfur Analyzer is a fully automated, high-precision analytical instrument engineered for the quantitative determination of total sulfur content in liquid and gaseous hydrocarbon samples—such as gasoline, diesel, naphtha, liquefied petroleum gas (LPG), and natural gas—using the microcoulometric titration principle. In accordance with Faraday’s law of electrolysis, sulfur-containing compounds are thermally oxidized at high temperature (typically 800–1050 °C) in a quartz combustion tube under controlled nitrogen/oxygen carrier gas flow, converting all sulfur species quantitatively to sulfur dioxide (SO₂). The SO₂ is swept into a dual-electrode microcoulometric titration cell, where it reacts stoichiometrically with electrogenerated iodine (I₂). The instrument continuously monitors the electrolytic current required to regenerate I₂, integrating charge (Q, in coulombs) over time. Total sulfur mass is calculated directly from Q using the theoretical equivalence factor of 16.03 µg S per millicoulomb—ensuring trace-level accuracy and metrological traceability.
Key Features
- Microprocessor-controlled combustion and titration system with real-time feedback regulation of furnace temperature, gas flow rates, and cell bias voltage.
- Dual-mode operation: supports both manual and programmable auto-sampling via optional 10-position or 40-position autosamplers compliant with ASTM D3227 and ISO 20846 workflows.
- High-stability quartz combustion tube with integrated ceramic insulation and rapid thermal ramping (0–1050 °C in <60 s), optimized for complete sulfur conversion without carbon deposition.
- Low-noise, low-drift coulometric cell featuring platinum working and auxiliary electrodes, Ag/AgCl reference electrode, and proprietary electrolyte formulation for extended service life (>10,000 injections).
- Fan-cooled thermal management system with intelligent thermal monitoring: cooling fans activate automatically upon furnace cooldown initiation and deactivate after reaching ambient threshold—eliminating manual intervention and reducing thermal stress on electronics.
- Integrated digital signal processing (DSP) module ensures sub-microcoulomb resolution (≤0.05 µC) and long-term baseline stability (<0.1 nA drift over 8 h).
Sample Compatibility & Compliance
The KY-200 is validated for analysis of volatile and non-volatile petroleum matrices, including light distillates (ASTM D129, D2622), middle distillates (ASTM D5453), LPG (SH/T 0222–1992), natural gas (GB/T 11061–1997), and refinery process streams. It conforms to regulatory and industry-standard test methods including SH/T 0253–1992 (light petroleum products), GB/T 11061–1997 (natural gas), and SH/T 0222–1992 (LPG). Instrument design and software architecture support GLP-compliant operation: full electronic audit trail, user access levels (admin/operator/analyst), and data integrity features aligned with FDA 21 CFR Part 11 requirements when deployed with validated PC configuration and networked storage.
Software & Data Management
The KY-200 operates with dedicated Windows-based acquisition and analysis software (v3.2+), supporting method setup, real-time chromatogram-like titration curve visualization, peak integration, calibration curve generation (linear or quadratic), and QC reporting (system suitability, blank correction, recovery checks). All raw data—including time-resolved current, voltage, temperature, and gas flow logs—are stored in encrypted binary format with XML metadata. Export options include CSV, PDF, and LIMS-compatible ASTM E1384-compliant .xml files. Software includes built-in compliance tools: electronic signatures, change control logs, and automatic backup to network drives or NAS devices.
Applications
- Refinery quality control: monitoring sulfur removal efficiency across hydrotreating units (HDS) and monitoring product spec compliance (e.g., ultra-low-sulfur diesel ≤10 ppm).
- Environmental testing labs: verification of fuel sulfur content per EPA Method IP-401 and EU EN 15969 regulations.
- R&D laboratories: kinetic studies of sulfur compound reactivity, catalyst evaluation, and feedstock screening.
- Contract testing facilities: high-throughput batch analysis with automated sample queueing, pass/fail flagging, and customizable certificate of analysis (CoA) templates.
FAQ
What sulfur species does the KY-200 detect?
It detects total sulfur—including mercaptans, sulfides, disulfides, thiophenes, benzothiophenes, and dibenzothiophenes—as all are quantitatively converted to SO₂ under oxidative pyrolysis conditions.
Is the instrument compatible with ASTM D5453?
Yes—the KY-200 meets the fundamental measurement principle and performance criteria of ASTM D5453 (oxidative microcoulometric method), though final method validation must be performed per laboratory SOPs.
What maintenance is required for the coulometric cell?
Electrolyte replacement every 2–3 weeks under continuous use; electrode polishing recommended quarterly; cell cleaning with ultrapure water and acetone every 500 injections.
Can the KY-200 analyze solid samples?
Not directly—solid or viscous samples require prior dissolution in suitable solvents (e.g., xylene, chloroform) or dilution with light hydrocarbon carriers, following SH/T 0689–2000 guidelines.
Does the system support remote diagnostics?
Yes—via secure RDP or VNC connection with prior authorization; firmware updates and calibration diagnostics are accessible through the embedded service interface.
