YWSD Intrinsically Safe Mine-Use Temperature & Humidity Data Logger

Overview

The YWSD Intrinsically Safe Mine-Use Temperature & Humidity Data Logger is an ATEX- and IECEx-aligned environmental monitoring instrument engineered specifically for hazardous locations in underground coal mines, chemical processing facilities, and combustible dust environments. It operates on the principle of capacitive relative humidity sensing combined with precision thermistor-based temperature measurement, enabling simultaneous real-time acquisition of ambient temperature, relative humidity, and calculated dew point temperature. Its intrinsic safety design—certified to Exib I Mb (for Zone 0/1 coal mine applications), Exib IIC T5 Gb (for Zone 1/2 flammable gas atmospheres), and Exib D 21 T100 (for Zone 21 combustible dust)—ensures compliance with stringent international explosion protection standards including IEC 60079-0, IEC 60079-11, and GB 3836.1–2021. The device is not intended for general laboratory use but rather for continuous, unattended environmental surveillance where personnel safety, regulatory traceability, and operational continuity are paramount.

Key Features

• Triple-parameter measurement: simultaneous acquisition of temperature (−30 °C to +70 °C), relative humidity (0–100 % RH), and dew point (−30 °C to +100 °C)
• Intrinsically safe architecture validated for Class I, Division 1 (coal mine), Class I, Division 2 (gas), and Class II, Division 2 (dust) hazardous locations
• High-resolution backlit LCD display with real-time values, status indicators (green operational / red fault / yellow warning LEDs), and configurable alarm feedback
• Robust IP65-rated enclosure suitable for high-humidity, dusty, and vibration-prone underground environments
• Configurable sampling intervals from 2 seconds to 24 hours, supporting both rapid transient capture and long-term trend logging
• On-device data hold, min/max tracking, and auto-capture of extreme values during active logging sessions
• Integrated non-volatile memory storing up to 32,700 timestamped records with internal clock accuracy ±1 minute/month

Sample Compatibility & Compliance

The YWSD logger is validated for direct exposure to ambient mine air, ventilation ducts, rescue chambers, chemical storage zones, and powder-handling areas. It does not require sample conditioning or external aspiration—measurements are performed in situ via its front-mounted sensor array. All certifications are issued by nationally accredited testing laboratories under CNAS (China National Accreditation Service) and recognized internationally through mutual recognition agreements (MRAs). Compliance includes GB/T 18204.1–2013 (public health environmental monitoring), AQ 1029–2019 (coal mine safety monitoring), and alignment with ISO 8573-1 (compressed air purity) for auxiliary air systems. While not FDA 21 CFR Part 11 compliant out-of-the-box, audit trails and user-access logs may be enabled via firmware update per site-specific validation protocols.

Software & Data Management

Data retrieval is performed via standard USB 2.0 interface using the included Datalogger Configuration & Analysis Suite (Windows-compatible, supports Windows 2000 through Windows 7). The software enables full parameter configuration—including logging interval, alarm thresholds, date/time sync, and unit selection—as well as post-acquisition visualization. Exported datasets support CSV, XLSX, and PDF formats; time-series plots include dual-Y axis overlays (temperature vs. RH), dew point deviation analysis, and statistical summaries (mean, SD, min/max, trend slope). All logged entries contain embedded UTC timestamps, device ID, and battery voltage status—facilitating GLP-compliant record retention and third-party audit readiness.

Applications

• Coal mine ventilation monitoring: continuous tracking of intake/outlet air conditions for resistance calculations and airflow modeling per MSHA and AQ 1029 requirements
• Underground rescue chamber environmental verification: ensuring life-support parameters remain within survivable limits (e.g., ≤35 °C, ≤85 % RH) during emergency occupancy
• Occupational health surveillance: documenting thermal stress indices (WBGT approximation) and respirable dust correlation factors in mining and chemical sectors
• Hazardous area commissioning and periodic verification: supporting ATEX/IECEx maintenance schedules and regulatory inspections by coal safety bureaus and provincial emergency management departments
• Chemical warehouse climate control: detecting condensation risk via dew point monitoring to prevent corrosion, caking, or reactive instability in stored materials

FAQ

Is the YWSD logger certified for use in methane-rich coal mine return airways?
Yes—it carries the Exib I Mb marking, which permits deployment in Zone 0 and Zone 1 methane atmospheres per GB 3836.4–2021 and IEC 60079-11:2011.
Can the device operate continuously without external power?
Yes—powered by two standard AA lithium batteries, it delivers up to 12 months of operation at 10-minute logging intervals under typical underground thermal conditions (20–25 °C, 60 % RH).
Does the software support multi-device fleet management?
No—the current Datalogger Suite is designed for single-unit configuration and download; batch synchronization requires manual import/export workflows.
What is the calibration traceability path for factory-certified units?
Each unit ships with a certificate of conformity referencing internal calibration against NIM (National Institute of Metrology, China)-traceable reference standards; field recalibration is recommended annually or after mechanical shock exposure.
Is firmware upgrade capability available?
Yes—USB-based firmware updates are supported via the manufacturer’s authorized service channel; version history and release notes are provided upon request for quality system documentation.