HUANKONG JHK-4000 WBGT Heat Stress Index Meter

Overview

The HUANKONG JHK-4000 WBGT Heat Stress Index Meter is a purpose-built environmental monitoring instrument engineered for quantitative assessment of heat stress in occupational settings. It calculates the Wet-Bulb Globe Temperature (WBGT) index—a composite thermal metric defined by ISO 7243 and adopted globally for occupational health surveillance—using simultaneous measurements of natural wet-bulb temperature (T_nw), black-globe temperature (T_g), and dry-bulb (ambient) air temperature (T_a). The instrument implements the standard weighted formula: WBGT = 0.7×T_nw + 0.2×T_g + 0.1×T_a (for outdoor environments with solar load) or WBGT = 0.7×T_nw + 0.3×T_g (for indoor or shaded conditions). Designed specifically for compliance-driven industrial hygiene applications, the JHK-4000 supports regulatory evaluation against national standards including GB/T 17244–1998, GB/T 18977–2003, GBZ/T 189.7–2007, and GB/T 4200–2008, enabling systematic classification of work environments per heat stress severity thresholds.

Key Features

• Integrated tri-sensor architecture: Simultaneous acquisition of dry-bulb, natural wet-bulb, and black-globe temperatures using calibrated thermistors and a precision 150-mm diameter matte-black copper globe sensor (emissivity ≥0.95).
• 3.0-inch high-contrast color LCD display with real-time WBGT value, component temperatures, time-stamped logging status, and battery level indication.
• Three-stage programmable measurement protocol: Supports sequential timed sampling intervals aligned with ISO 7243 and GB/T 17244–1998 requirements for representative exposure assessment.
• High-capacity onboard memory storing ≥5,000 timestamped WBGT records with full traceability (date, time, T_a, T_nw, T_g, calculated WBGT).
• Configurable logging interval from 1 to 60 minutes, allowing optimization for short-term task analysis or extended shift monitoring.
• Embedded Bluetooth 4.0 module compliant with Bluetooth SIG profiles for secure wireless data export to Windows/macOS/Linux hosts or mobile devices running compatible industrial hygiene software.
• Optional triple-gradient WBGT expansion: Enables concurrent spatial profiling across three distinct vertical or horizontal positions—critical for evaluating thermal stratification in foundries, glass manufacturing, or boiler rooms.

Sample Compatibility & Compliance

The JHK-4000 is validated for use across diverse industrial thermal environments—including metallurgical facilities, power generation plants, textile dyeing units, bakery ovens, and outdoor construction sites—where ambient temperatures range from 0 °C to 120 °C and relative humidity may exceed 80% RH. Its sensor design adheres to the physical specifications outlined in ISO 7243 Annex B and ACGIH TLV® documentation for WBGT instrumentation. All temperature measurements are traceable to NIST-traceable references via factory calibration certificates. The device meets electromagnetic compatibility (EMC) requirements per IEC 61326-1 for industrial environments and conforms to IP54 ingress protection for dust and water resistance during field deployment. It supports audit-ready documentation workflows required under OHSAS 18001, ISO 45001, and China’s GBZ 2.2–2014 occupational exposure limit framework.

Software & Data Management

Data retrieval and reporting are facilitated through HUANKONG’s proprietary PC-based WBGT Analysis Suite (v3.2+), which imports CSV-formatted logs via Bluetooth or USB interface. The software enables automated WBGT trend visualization, comparative analysis across multiple instruments or locations, and generation of PDF reports compliant with GLP-aligned record-keeping practices. Audit trails include operator ID, calibration history, firmware version, and timestamped metadata for each recorded value. Optional integration with enterprise EHS platforms is supported via standardized RESTful API endpoints, permitting synchronization with incident management systems and regulatory submission portals. All stored data retains full integrity under FDA 21 CFR Part 11-compliant electronic signature and access control configurations when deployed in pharmaceutical or food processing QA/QC environments.

Applications

• Ongoing heat stress surveillance during summer months in outdoor utility maintenance, road paving, and agricultural operations.
• Baseline and periodic assessment of furnace-facing workstations in steel mills and aluminum smelters.
• Validation of engineering controls (e.g., local exhaust ventilation, radiant barrier installation) before and after implementation.
• Supporting medical surveillance programs by correlating WBGT exposure duration with physiological strain indicators (e.g., core temperature, heart rate variability).
• Training and awareness initiatives: Real-time WBGT readouts assist safety officers in demonstrating thermal hazard gradients and justifying rest/water scheduling protocols.
• Research applications in ergonomics laboratories studying human thermoregulatory response under controlled hyperthermal conditions.

FAQ

What standards does the JHK-4000 comply with for WBGT measurement?
It complies with ISO 7243, GB/T 17244–1998, GB/T 18977–2003, GBZ/T 189.7–2007, and GB/T 4200–2008, covering methodology, sensor specifications, and exposure limit interpretation.
Can the instrument operate continuously in environments above 60 °C?
Yes—the operational ambient range extends to 120 °C, and the black-globe sensor is thermally stabilized to maintain accuracy under sustained radiant heat loads typical of industrial furnaces and kilns.
Is calibration traceable to national metrology institutes?
Each unit ships with a factory calibration certificate referencing NIST-traceable standards; on-site recalibration services are available through HUANKONG-certified service centers in Asia-Pacific regions.
How is data integrity ensured during Bluetooth transmission?
All wireless transfers use AES-128 encryption and include CRC-32 checksum validation; received datasets are automatically verified against original memory registers prior to import.
Does the triple-gradient option require additional hardware or firmware licensing?
Yes—triple-gradient operation requires the optional JHK-4000-TG sensor kit (three synchronized probe assemblies) and activation of the Multi-Zone Firmware Module (sold separately).