Jiada Xiaotian’e GDYK-211S Portable TVOC Analyzer
| Brand | Jiada Xiaotian’e |
|---|---|
| Origin | Jilin, China |
| Manufacturer Type | Direct Manufacturer |
| Country of Origin | China |
| Model | GDYK-211S |
| Detection Limit | 0.05 mg/m³ |
| Measurement Range | 0.00–4.00 mg/m³ |
| Accuracy | ±5% |
| Power Supply | 9 V alkaline battery (≥40 h continuous operation) |
| Auto-power-off | 10 min inactivity |
| Method | Colorimetric reaction with pre-packaged reagent cartridges |
| Dimensions & Weight | Compact handheld design, <300 g |
Overview
The Jiada Xiaotian’e GDYK-211S Portable TVOC Analyzer is a field-deployable, quantitative gas detection instrument engineered for rapid on-site assessment of total volatile organic compounds (TVOC) in indoor air environments. It operates on the principle of colorimetric chemical reaction—where sampled air is drawn through a pre-calibrated, single-use reagent cartridge containing proprietary chromogenic agents. Upon exposure to VOCs, the reagent undergoes a stoichiometric color change proportional to analyte concentration, which is optically quantified via an integrated solid-state photometer with fixed-wavelength LED detection (520 nm ± 5 nm). Unlike sensor-based or PID-based instruments, this method delivers direct mass-concentration readouts in mg/m³ without reliance on compound-specific calibration curves or compensation algorithms. The GDYK-211S is designed specifically for compliance screening and preliminary risk assessment in non-laboratory settings—including residential dwellings, office buildings, schools, hotels, and light industrial workspaces—where real-time, operator-independent data acquisition is prioritized over speciated VOC identification.
Key Features
- Quantitative colorimetric measurement traceable to national reference standards for TVOC (e.g., GB/T 18883–2022, HJ 683–2014)
- Pre-loaded, sealed reagent cartridges minimize handling errors, eliminate solvent use, and reduce cross-contamination risk
- Integrated photometric reader with auto-zeroing function and linear response across full 0.00–4.00 mg/m³ range
- Low-power architecture: single 9 V alkaline battery supports ≥40 hours of active sampling and display operation
- Intelligent power management: automatic shutdown after 10 minutes of inactivity; no mechanical switch required
- Ergonomic handheld form factor (145 × 75 × 38 mm; ≤280 g) with backlit LCD and tactile membrane keypad
- No external calibration gases or zero-air sources needed—calibration verified at factory and maintained via cartridge lot certification
Sample Compatibility & Compliance
The GDYK-211S is validated for use with undiluted ambient air samples collected at standard temperature and pressure (25 °C, 101.3 kPa). It responds collectively to C6–C16 aliphatic, aromatic, and oxygenated VOCs—including benzene, toluene, ethylbenzene, xylenes (BTEX), styrene, hexane, heptane, acetone, and ethanol—at concentrations relevant to WHO and Chinese indoor air quality guidelines (IAQG). Each reagent batch undergoes independent verification per GB/T 27417–2017 (Guidelines for validation of analytical methods) and includes certificate of analysis documenting sensitivity, linearity (R² ≥ 0.998), and inter-batch reproducibility (CV ≤ 4.2%). While not intended for regulatory enforcement-level reporting, the instrument meets technical requirements for preliminary screening under GB 50325–2020 (Control Standard for Indoor Environmental Pollution of Civil Construction Projects) and supports GLP-aligned documentation workflows.
Software & Data Management
Data are stored internally (up to 200 test records) with timestamp, location tag (manual entry), operator ID, and raw absorbance value. USB-C interface enables export to CSV via companion PC utility (Windows 10/11 compatible). Exported files include metadata fields compliant with ISO/IEC 17025:2017 clause 7.8.2 for result traceability. Audit trail functionality logs all configuration changes, battery status events, and cartridge insertion/removal timestamps—supporting basic 21 CFR Part 11 readiness when deployed in QA/QC contexts requiring electronic record integrity.
Applications
- Routine IAQ surveys during building commissioning, post-renovation clearance, or HVAC performance verification
- Occupational hygiene assessments in printing facilities, furniture manufacturing, and coating application areas
- Public health field studies evaluating ventilation efficacy in classrooms and elderly care centers
- Real-estate due diligence testing prior to lease signing or property handover
- Educational demonstrations of indoor pollution sources (e.g., cleaning products, adhesives, new furnishings)
FAQ
What VOC compounds does the GDYK-211S detect?
It provides a summed response to common C6–C16 volatile organics as defined in GB/T 18883–2022, including but not limited to alkanes, aromatics, ketones, and alcohols.
Is calibration required before each use?
No—factory calibration is retained per reagent cartridge lot; users perform only a blank check using fresh cartridge prior to first measurement.
Can results be used for regulatory reporting?
Results serve as screening-level data; confirmatory analysis by GC-MS or TD-GC-FID is required for compliance documentation under most national frameworks.
How often must reagent cartridges be replaced?
One cartridge is consumed per measurement cycle; shelf life is 18 months unopened, stored at 2–25 °C in original packaging.
Does the device require periodic maintenance?
No moving parts or optical alignment adjustments are needed; routine cleaning of the air inlet filter and photometer window with lint-free cloth is recommended after every 50 tests.
