Meteorology (AWS)
ND-BLG Black Globe Temperature Sensor (WBGT)
What is the ND-BLG? The ND-BLG is a black globe temperature sensor based on a thermistor inside a high-emissivity (0.957) black hollow sphere. The radiant globe temperature is the missing input for accurate Wet Bulb Globe Temperature (WBGT) heat-stress index calculations — essential for outdoor workplace safety, heat stress measurement, sports event safety, agricultural worker protection and meteorological observation when paired with the yDoc ML-525 datalogger.
The ND-BLG is a black globe temperature sensor based on a thermistor inside a high-emissivity (0.957) black hollow sphere. The radiant globe temperature is the missing input for accurate Wet Bulb Globe Temperature (WBGT) heat-stress index calculations — essential for outdoor workplace safety, heat stress measurement, sports event safety, agricultural worker protection and meteorological observation when paired with the yDoc ML-525 datalogger.
Key parameters
What the ND-BLG measures
Radiant globe temperature
−5 to +95 °C operating range, ±0.3 °C accuracy
WBGT calculation
Globe temp is the key WBGT input — combined with air T and RH
High emissivity
0.957 black hollow sphere for accurate radiant balance
Direct integration
3 m cable to the yDoc ML-525 over SDI-12
Specifications
Technical specifications
Applications
Where the ND-BLG is used
Outdoor remote monitoring
Long-term unattended heat-stress monitoring at remote sites without mains power.
Workplace safety
Occupational heat-stress monitoring on construction sites, factories and outdoor work.
Heat stress measurement
Direct radiant temperature input for heat-stress assessment in any setting.
WBGT calculation
Standard WBGT heat-stress index for athletes, military training and labour standards.
Meteorology
Radiant temperature observations for atmospheric science and microclimate research.
Integration
Powered by the yDoc ML-525 datalogger
The ND-BLG connects directly to the yDoc ML-525 datalogger. The yDoc powers the sensor, schedules measurements, stores readings locally and transmits them to the Sensor-Online platform via 4G/LTE-M, NB-IoT, LoRaWAN, satellite or Ethernet — with up to 10 years of battery life.
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FAQ
Frequently asked questions about the ND-BLG
What does the ND-BLG measure?+
What is WBGT?+
When to use it for safety alerts?+
Ready to deploy the ND-BLG?
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