YWS D70/100 Intrinsically Safe Mine-Use Temperature and Humidity Detector

Overview

The YWSD70/100 Intrinsically Safe Mine-Use Temperature and Humidity Detector is a certified environmental monitoring instrument engineered for continuous, real-time measurement of ambient temperature and relative humidity in underground coal mine environments where explosive gas atmospheres (methane/air mixtures) may be present. Designed in strict compliance with China’s mandatory safety standards for mining equipment—specifically GB 3836.1–2010 (Explosive Atmospheres – Part 1: General Requirements) and GB 3836.4–2010 (Intrinsic Safety “i” Protection)—the device features an Exib I Mb explosion-proof rating, certifying its suitability for use in Zone 0/1 mining zones classified under IEC 60079-0 and IEC 60079-11. Its core sensing architecture integrates high-stability capacitive humidity sensors and precision platinum-resistance (Pt1000-class equivalent) temperature elements, enabling simultaneous dual-parameter acquisition with traceable metrological performance. The instrument operates without external power infrastructure, relying solely on a single 9 V alkaline battery, and supports long-term field deployment with ultra-low standby current (<10 µA), ensuring operational continuity across multi-shift mining operations.

Key Features

• Intrinsically safe design validated per Exib I Mb certification—approved for use in methane-laden underground mine roadways, intake/return airways, and rescue staging areas.
• Dual-parameter measurement: simultaneous readout of temperature (−30 °C to +70 °C) and relative humidity (0–100 %RH) on a backlit 4½-digit LCD display.
• High-resolution data capture: 0.01 °C temperature resolution and 0.01 %RH humidity resolution support fine-grained environmental trend analysis.
• On-device data retention functions: MAX/MIN value tracking, HOLD mode for instantaneous parameter freezing, and automatic logging with configurable sampling intervals (≤500 ms).
• Rapid sensor response: ≤10 seconds to reach 90 % of final RH reading under standardized still-air conditions at 25 °C—critical for dynamic ventilation assessments.
• USB interface compliant with USB 2.0 full-speed specification enables direct connection to Windows-based PCs for firmware updates, parameter configuration, and bulk data retrieval.
• Robust mechanical construction: IP54-rated enclosure resists dust ingress and water splashing—suitable for high-humidity, particulate-rich mine environments.

Sample Compatibility & Compliance

The YWSD70/100 is explicitly intended for gaseous ambient sampling in non-corrosive, non-condensing mine air. It is not designed for immersion, direct contact with liquids, or exposure to aggressive chemical vapors (e.g., H₂S above 10 ppm, SO₂, or diesel particulates). Its certified operation range (−20 °C to +50 °C ambient) ensures reliable function during seasonal surface-to-underground transport and in thermally stratified shafts. Regulatory compliance includes: Coal Mine Safety Mark (KA certification), National Supervision and Inspection Report (No. KJ2023-XXXXX), and CNEX-certified Exib I Mb test report. While not FDA- or ISO/IEC 17025-accredited for laboratory metrology, the device meets the functional accuracy requirements specified in AQ 1029–2019 (Technical Specifications for Methane Monitoring Systems in Coal Mines) and MT/T 1079–2008 (Standard for Environmental Parameter Monitoring Instruments in Underground Coal Mines).

Software & Data Management

The included Windows-compatible upper-computer software (v3.2+) provides full bidirectional communication via virtual COM port emulation. Users may configure logging intervals (1 s to 24 h), set alarm thresholds for temperature or RH excursions, and define auto-start/stop triggers. All stored records—including timestamps, measured values, and sensor status flags—are exportable in CSV and XLSX formats. The software generates time-series plots with dual-Y axes, overlays statistical summaries (mean, SD, min/max), and supports GLP-aligned audit trails: each data file contains embedded metadata (device ID, calibration date, operator tag, firmware version). Data integrity is preserved through CRC-16 checksum validation during USB transfer, and local storage employs wear-leveling algorithms to maintain flash endurance over ≥10,000 logging cycles.

Applications

• Real-time ventilation efficiency verification during mine airflow resistance surveys (per AQ 1057–2019).
• Environmental baseline monitoring for occupational health compliance (e.g., thermal stress assessment per GBZ 2.2–2014).
• Pre-deployment calibration verification and post-rescue environmental documentation in emergency response protocols.
• Longitudinal humidity trending in conveyor belt galleries to assess spontaneous combustion risk indicators.
• Supporting regulatory submissions to provincial Coal Mine Safety Administration (CMSA) offices and third-party safety evaluation agencies.
• Integration into legacy mine monitoring networks via optional RS-485 gateway adapters (sold separately).

FAQ

Is the YWSD70/100 suitable for surface-based industrial hygiene monitoring?
Yes—though certified for underground use, its IP54 rating, wide operating temperature range, and intrinsic safety architecture make it equally appropriate for surface coal preparation plants, stockpile monitoring, and confined-space entry pre-checks.
Does the device require periodic recalibration?
Per manufacturer guidelines, annual verification against NIST-traceable reference standards is recommended; no field-adjustable calibration is provided—only factory service recalibration is supported.
Can logged data be synchronized with SCADA or MES platforms?
Direct OPC UA or Modbus TCP integration is not natively supported; however, exported CSV files can be ingested into common industrial data historians (e.g., Siemens Desigo CC, Honeywell Experion) via custom ETL pipelines.
What is the expected battery life under typical logging conditions?
With 10-second sampling interval and backlight disabled, average service life exceeds 12 months (≈8,000 hours); battery voltage is continuously monitored and displayed during startup.
Is the USB interface isolated for electrical safety in high-noise mine environments?
No galvanic isolation is integrated—the USB port relies on the host PC’s grounding scheme; use only shielded USB cables rated for industrial environments (e.g., Belden 9841).