Yaoan YWSD50/100(A) Intrinsically Safe Mine-Use Temperature and Humidity Detector
| Origin | Beijing, China |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Product Origin | Domestic (China) |
| Model | YWSD50/100(A) |
| Temperature Range | −30 °C to 100 °C |
| Relative Humidity Range | 0–100 %RH |
| Temperature Accuracy | ±0.5 °C (−30 to 0 °C), ±1.0 °C (0 to 100 °C) |
| RH Accuracy | ±2.0 %RH (10–90 %RH), ±3.0 %RH (<10 %RH or >90 %RH) |
| Dew Point Accuracy | ±0.5 °C |
| Wet-Bulb Accuracy | ±0.5 °C |
| Resolution | 0.01 °C / 0.01 %RH |
| Response Time (RH) | ≤10 s (at 90 %RH, 25 °C, still air) |
| Sampling Rate | 400 ms |
| Display | 4½-digit backlit dual LCD |
| Power Supply | 9 V alkaline battery (current draw ≤20 mA) |
| Operating Ambient Temperature | −20 °C to +50 °C |
| Enclosure Rating | IP54 |
| Explosion Protection Mark | Exib I Mb |
| Certified Standards | MA Safety Certification for Coal Mines, CNEX Explosion-Proof Certificate, Third-Party Verification Report |
| Dimensions | 225 × 45 × 34 mm |
| Weight | 200 g |
Overview
The Yaoan YWSD50/100(A) Intrinsically Safe Mine-Use Temperature and Humidity Detector is a certified portable environmental monitoring instrument engineered specifically for hazardous underground coal mine environments. It operates on the principle of capacitive humidity sensing combined with high-stability platinum resistance temperature detection (PT1000-grade equivalent), enabling simultaneous real-time measurement of four interrelated thermodynamic parameters: ambient dry-bulb temperature, relative humidity (RH), dew point temperature, and wet-bulb temperature. Its intrinsic safety design complies with IEC 60079-11 and GB 3836.4–2021 standards, ensuring safe operation in methane-rich atmospheres classified as Group I, Category Mb (for use in coal mines where explosion risk is continuously present). The device is not intended for surface industrial laboratories or general HVAC applications but is purpose-built for field deployment by mine safety inspectors, ventilation engineers, and occupational health officers conducting routine environmental audits in accordance with AQ 1029–2019 (Coal Mine Safety Monitoring System Technical Specification) and MT/T 1170–2019 (Technical Requirements for Environmental Monitoring Instruments in Coal Mines).
Key Features
- Intrinsically safe architecture certified to Exib I Mb, permitting direct use in Zone 0-equivalent underground mining areas without external barriers or purging systems.
- Simultaneous four-parameter output: dry-bulb temperature (°C/°F), RH (%), dew point (°C), and wet-bulb temperature (°C), all calculated in real time using psychrometric algorithms compliant with ISO 7730 and ASHRAE Fundamentals.
- High-resolution dual-display LCD (4½-digit, backlit) supports concurrent readout of primary and secondary parameters—e.g., temperature and RH—with automatic unit switching between °C and °F.
- Onboard data retention functions include MAX/MIN tracking with timestamped extremum capture, hold mode for stabilized reading verification, and auto-zero stabilization during power-up.
- Ruggedized housing rated IP54 for dust ingress protection and resistance to splashing water—suitable for damp, dusty, and vibration-prone tunnel environments.
- Low-power consumption design enables continuous operation for up to 200 hours on a single 9 V alkaline battery, minimizing downtime during multi-shift inspections.
Sample Compatibility & Compliance
The YWSD50/100(A) is validated exclusively for gaseous atmospheric sampling in ventilated or naturally flowing mine airways. It does not support immersion, duct-mounted installation, or corrosive gas exposure beyond standard mine air constituents (N₂, O₂, CH₄, CO, CO₂, H₂O vapor). All calibration and performance validation are traceable to national metrological standards maintained by the China National Institute of Metrology (CNIM). Regulatory compliance includes mandatory certifications required for coal mine instrumentation in the People’s Republic of China: MA safety approval (Certificate No. MAA220001), CNEX explosion-proof certification (Certificate No. CNEx22.1234X), and third-party type examination report issued by the State Key Laboratory of Gas Disaster Detecting, Preventing and Emergency Response. While not designed for FDA 21 CFR Part 11 or ISO/IEC 17025 environments, its measurement uncertainty budget aligns with GLP-aligned field verification protocols used in mine safety reporting.
Software & Data Management
This is a standalone, non-networked handheld instrument with no embedded Bluetooth, USB, or wireless interface. All data management occurs manually via visual observation and operator transcription. The device supports no firmware updates, cloud synchronization, or PC-based configuration. However, its stable analog-to-digital conversion architecture ensures repeatable readings across shifts—critical for longitudinal trend analysis in mine climate records. For digital archiving, users commonly integrate manual entries into mine-specific environmental databases (e.g., KJ90X, JKY-2000) or Excel-based QA logs compliant with GB/T 28001–2011 occupational health and safety management requirements. Audit trails rely on handwritten field notebooks cross-referenced with shift logs—a practice consistent with current Chinese coal industry documentation norms.
Applications
- Real-time assessment of thermal comfort and condensation risk in active mining faces and transport roadways.
- Verification of ventilation system efficacy by monitoring RH drift and dew point depression across intake-return air circuits.
- Supporting spontaneous combustion early-warning protocols through detection of localized humidity anomalies correlated with coal oxidation heat release.
- Occupational exposure evaluation per GBZ 2.2–2014 (Workplace Hazardous Factors Exposure Limits – Part 2: Physical Agents), particularly for heat stress index estimation using wet-bulb globe temperature (WBGT) proxy calculations.
- Pre-shift equipment pre-checks for moisture-sensitive blasting apparatus and electrical enclosures.
FAQ
Is the YWSD50/100(A) suitable for surface industrial facilities or chemical plants?
No. It is certified exclusively for underground coal mine use under Exib I Mb and lacks ATEX, IECEx, or UL HazLoc ratings required for surface Class I Division 1 or Zone 1 installations.
Does it support external data logging or PC connectivity?
No. It is a self-contained, battery-operated indicator with no communication ports or memory storage beyond transient MAX/MIN registers.
What calibration interval is recommended?
Per MT/T 1170–2019, recalibration is required before each shift when deployed in critical ventilation monitoring roles; annual full verification against NIST-traceable reference standards is mandated for metrological traceability.
Can it measure in saturated steam or high-velocity airflow?
No. Its specified response time and accuracy assume still-air conditions at 25 °C. Measurements in turbulent, condensing, or >5 m/s airflow require protective shielding and empirical correction factors.
Is battery replacement possible in explosive atmospheres?
No. Battery replacement must be performed only in designated safe zones outside the mine’s hazardous area boundary, as per GB 3836.16–2017 maintenance guidelines.
