Shengtai Instruments SH121 Automated Degassing Shaker for Chromatographic Sample Preparation
| Brand | Shengtai Instruments |
|---|---|
| Origin | Shandong, China |
| Manufacturer Type | Direct Manufacturer |
| Product Origin | Domestic (China) |
| Model | SH121 |
| Pricing | Upon Request |
Overview
The Shengtai Instruments SH121 Automated Degassing Shaker is a precision-engineered laboratory instrument designed specifically for standardized degassing of insulating oils and petroleum-based samples prior to gas chromatographic analysis. It operates on the principle of controlled thermal oscillation—combining precise temperature regulation with reproducible mechanical agitation—to facilitate efficient equilibration and release of dissolved gases (e.g., H₂, CH₄, C₂H₂, C₂H₄, C₂H₆, CO, CO₂) from transformer oil matrices. This process is essential for compliance with internationally referenced methods including GB/T 17623–2017 (equivalent to IEC 60567), GB/T 7598–2008, and DL 429.4, all of which govern the determination of dissolved gas content and water-soluble acid in operational transformer oils. The SH121 ensures consistent phase equilibrium between liquid and headspace gas, directly impacting chromatographic quantification accuracy and method reproducibility.
Key Features
- Programmable dual-mode thermal oscillation: Mode 1 (50 °C hold → 20 min oscillation → 10 min rest at 50 °C) and Mode 2 (50 °C hold → 5 min oscillation → hold at 75 °C), both fully automated with no manual intervention required.
- High-uniformity heating system with ±0.2 °C accuracy from ambient to 50 °C and ±0.3 °C from 50–100 °C, validated across the entire chamber volume using calibrated PT100 sensors.
- Stable mechanical oscillation at 275 ±3 cycles per minute with 35 mm amplitude, optimized for efficient mass transfer without sample splashing or vial displacement.
- Simultaneous processing of up to eight 100 mL gas-tight syringes or four 250 mL Erlenmeyer flasks—configured to accommodate standard ASTM D3612 and IEC 60567 sampling vessels.
- Intuitive 240 × 128 pixel backlit LCD interface with Chinese-language menu navigation and tactile non-marking membrane keys; front-access push-pull door enables ergonomic sample loading/unloading.
- Compact footprint (500 × 350 × 375 mm) and low acoustic emission (<55 dB(A)) suitable for shared analytical laboratories and QC environments where space and noise constraints apply.
Sample Compatibility & Compliance
The SH121 is validated for use with mineral insulating oils, synthetic esters, and silicone-based dielectric fluids commonly employed in power transformers and high-voltage equipment. Its operation aligns with the sample preparation requirements of multiple national and industry standards: GB/T 17623–2017 (dissolved gas analysis via GC), GB/T 7598–2008 (water-soluble acid by colorimetry), and GB/T 259–1988 (petroleum product acidity/alkalinity testing). While not an ISO/IEC 17025-accredited device itself, the SH121 supports GLP-compliant workflows when integrated into documented SOPs—including traceable calibration records, maintenance logs, and operator training documentation. Temperature and timing parameters are user-verifiable via external reference thermometers and stopwatch validation protocols.
Software & Data Management
The SH121 operates as a standalone hardware platform with embedded firmware—no PC connection or proprietary software required. All operational parameters (temperature setpoint, oscillation duration, rest interval, mode selection) are stored in non-volatile memory and retained after power cycling. The instrument maintains a local event log accessible via display menu, recording start time, completion status, and any fault codes (e.g., over-temperature, motor stall). For laboratories operating under FDA 21 CFR Part 11 or Annex 11 requirements, external electronic lab notebooks (ELNs) or LIMS systems may be used to capture timestamped run metadata, ensuring auditability of degassing conditions linked to downstream GC results.
Applications
- Dissolved gas analysis (DGA) sample preparation for predictive maintenance of power transformers and reactors.
- Water-soluble acid (WSA) extraction in routine oil-in-service monitoring programs per IEEE C57.104.
- Standardized degassing of lubricants and hydraulic fluids prior to elemental analysis (ICP-OES/MS) or FTIR spectroscopy.
- Method development and validation studies requiring tightly controlled thermal-mechanical exposure conditions.
- Research applications involving volatile organic compound (VOC) partitioning kinetics in non-aqueous matrices.
FAQ
Does the SH121 support external data export or remote control?
No—the SH121 is a dedicated benchtop instrument with no USB, Ethernet, or RS-232 interfaces. All operation is local via front-panel controls.
What is the recommended calibration frequency for temperature and timing accuracy?
Shengtai recommends annual verification using NIST-traceable digital thermometers and certified stopwatches; calibration certificates are provided with initial delivery.
Can the SH121 accommodate custom vial formats beyond 100 mL syringes and 250 mL flasks?
Yes—optional adapter plates are available for 20 mL headspace vials and 50 mL centrifuge tubes; contact technical support for mechanical compatibility assessment.
Is the unit compliant with electromagnetic compatibility (EMC) directives for CE-marked laboratories?
The SH121 meets GB/T 18268.1–2010 (equivalent to IEC 61326-1) for industrial EMC performance; full test reports are available upon request.
What maintenance is required during the one-year warranty period?
Routine cleaning of the oscillation platform and chamber interior is advised; no scheduled lubrication or internal servicing is required under normal operating conditions.
