Sida AS-18A Multifunctional Liquid Autosampler for Gas Chromatography

Overview

The Sida AS-18A Multifunctional Liquid Autosampler is an engineered solution designed specifically for routine and method-developed gas chromatography (GC) laboratories requiring high operational consistency, traceable sample handling, and seamless integration with third-party GC systems. Based on precise stepper-motor-driven syringe actuation and calibrated pneumatic/hydraulic sample aspiration, the AS-18A implements a robust open-loop liquid handling architecture compliant with fundamental GC sampling requirements—including reproducible injection volume delivery (typically 0.1–100 µL), minimal carryover (<0.01%), and thermal stability during needle wash and dwell cycles. Its design prioritizes method transferability across diverse GC platforms—whether Agilent, Shimadzu, Thermo Fisher, or PerkinElmer—through standardized digital handshake protocols and hardware-level trigger synchronization.

Key Features

• 18-position heated or ambient sample tray compatible with standard 12 × 32 mm or 15 × 45 mm GC vials, supporting both single- and dual-syringe configurations for parallel or sequential injection sequences.
• Integrated 4.3-inch capacitive touch display with real-time status feedback, context-sensitive soft keys, and intuitive step-by-step parameter entry—eliminating reliance on external PCs for basic method setup.
• Bidirectional hardware triggering: GC instrument can initiate autosampler run start via TTL pulse; conversely, the AS-18A can emit a synchronized trigger signal to start GC oven ramp and data acquisition—enabling fully coordinated system-level timing.
• On-device parameter validation engine prevents out-of-spec entries (e.g., invalid injection volume, excessive wash solvent volume, or non-integer replicate count), ensuring method integrity prior to execution.
• Configurable sleep mode activates after completion of scheduled runs, reducing power consumption by >65% versus continuous operation—aligned with ISO 50001-aligned lab energy management practices.
• Support for sandwich (layered) injection—where internal standard and analyte solutions are aspirated in discrete layers within the same syringe—minimizing cross-contamination and improving quantitative precision in complex matrix analyses.

Sample Compatibility & Compliance

The AS-18A accommodates aqueous, organic, and mixed-solvent samples with viscosity up to 20 cP at 25 °C. Needle selection (e.g., 10 µL, 50 µL, or 100 µL fixed-volume syringes) is user-replaceable and compatible with common GC septa penetration standards (e.g., 0.5 mm thickness, 12 mm diameter). All fluidic pathways are chemically inert (PTFE, PEEK, and stainless-steel components), meeting USP material compatibility guidelines for pharmaceutical residual solvent analysis. While not certified to IEC 61000-6-3 (EMC) or UL 61010-1 out-of-the-box, the unit complies with GB/T 18268.1–2010 (Chinese equivalent of IEC 61326-1) for laboratory equipment electromagnetic immunity and safety. It supports audit-trail-ready operation when paired with GC software enabling electronic record retention per FDA 21 CFR Part 11 Annex 11 principles.

Software & Data Management

No proprietary PC software is required for core operation; however, ASCII-based command protocol documentation (available upon request) enables integration into LIMS or custom Python/Matlab control environments via serial or USB CDC interface. The embedded firmware logs all executed commands, timestamps, error codes, and hardware status events to non-volatile memory—accessible via USB mass-storage dump for GLP-compliant review. Optional CSV export of run logs includes vial position, injection volume, rinse cycle count, and trigger source identification—facilitating QC batch reconciliation and deviation investigation.

Applications

The AS-18A serves validated workflows in environmental testing (EPA Method 502.2, 8021B), petrochemical quality control (ASTM D3606, D5501), food safety residue screening (GB 23200.113–2021), and pharmaceutical residual solvent quantitation (ICH Q2(R2), USP ). Its dual-syringe capability supports internal standard addition directly pre-injection—critical for minimizing matrix effects in headspace GC-FID applications. The sandwich injection mode is routinely applied in forensic toxicology labs performing simultaneous ethanol/acetaldehyde quantification in blood extracts.

FAQ

Does the AS-18A support programmable wash cycles between injections?
Yes—users may define up to three independent wash solvents per method step, with configurable draw/volume/flush/dwell parameters.
Is remote monitoring possible via Ethernet or Wi-Fi?
No native Ethernet or Wi-Fi module is included; connectivity is limited to RS-232, USB virtual COM, and hardware trigger I/O.
Can the AS-18A be used with liquid chromatography systems?
It is optimized for GC pressure/flow dynamics and lacks LC-compatible high-pressure sealing or gradient-compatible solvent selection valves—use with HPLC/UHPLC is not recommended.
What maintenance intervals are recommended for syringe and needle assemblies?
Syringe calibration verification is advised every 500 injections; needle replacement is recommended after 2,000 penetrations or upon visible wear or leakage.
Is GMP-compliant documentation available for installation qualification (IQ) and operational qualification (OQ)?
Standard factory test reports and mechanical calibration certificates are provided; full IQ/OQ protocol templates may be supplied under NDA for regulated users.