空气温度传感器 / BLACKGLOBE-L
BLACKGLOBE-L 热应力温度传感器
Manage Heat Stress
WBGT calculation for heat stress
气象 应用支持 湍流通量 应用支持 水资源 应用支持 能源 应用支持 基础建设 应用支持 土壤 应用支持

概览

黑球热应力温度传感器利用置于15.2厘米的空心铜漆成黑色的球体内的热敏电阻测量辐射温度。这种测量同事测量外部环境温度和湿球温度,用于计算湿球全球温度 (WBGT) (也称湿润指数)。 

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技术说明

Loss of physical and mental efficiency occurs under definable degrees of heat stress. Severe heat stress can lead to fatigue, exhaustion and possibly even disability or death. The Wet-Bulb Globe Temperature (WBGT) index combines the effects of temperature, humidity, radiant heat, and wind into one single index employed to express environmental heat stress.

Heat stress can be reduced by decreasing the lengths of exposure and decreasing the workload of individuals under heat stress. Factors such as the type of clothing worn, the type of work performed, the psychological effects of stress, and availability of fluids can affect the assessment of heat stress, but these factors are not easily quantified. Environmental factors such as temperature, humidity, and wind are more easily measured to assess heat stress.

To calculate the WBGT index, the measurement of the black globe (radiant heat), wet bulb (evaporative heat), and ambient air (dry bulb) temperatures are required. The wet-bulb temperature can be calculated using air temperature and relative humidity if a wet-bulb thermometer is not available.

A custom cable length will need to be specified when the BlackGlobe is ordered. The maximum suggested cable length is 304 meters (1,000 feet).

产品规格

  • Temperature Measurement Range: -5° to +95°C
  • Temperature Survival Range: -50° to +100°C
  • Thermistor Interchangeability Error: Typically < ±0.2°C over 0° to 70°C, and ±0.3 at 95°C
  • Polynomial Linearization Error: < ±0.5°C over -7° to +90°C
  • Near Normal Emittance: 0.957
  • Maximum Cable Length: 305 m (1000 ft)

兼容性

Datalogger Considerations

The BlackGlobe requires an analog measurement. One single-ended and one excitation channel are required.

Compatible Contemporary Dataloggers

CR200(X) Series CR800/CR850 CR1000 CR3000 CR9000X CR6 Series CR300 Series

Compatible Retired Dataloggers

CR500 CR510 CR10 CR10X 21X CR23X CR9000 CR5000 CR7X

常见问题解答

BLACKGLOBE-L: 3

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  1. Heat stress refers to the human body’s inability to maintain a normal temperature because of conditions such as high temperature and humidity. Certain jobs or activities require people to be subjected to these conditions, which may put their bodies at risk of heat-related illnesses and possibly result in death. Heat-related illnesses include heat cramps, heat exhaustion, and heat stroke.

    Typical temperature measurements require an aspirated shield to prevent direct solar radiation from skewing the measurements. In contrast, direct solar radiation is required as a component to measure environmental heat stress.

  2. When these sensors are purchased, the following calibration services are offered: TEMPCAL and TEMPCAL2.

    • TEMPCAL provides a single-point calibration and a calibration certificate. The single-point calibration determines the offset at 25°C with an uncertainty of ±0.05°C.
    • TEMPCAL2 provides a two-point calibration and a calibration certificate. The two-point calibration determines offsets at 30°C and 65°C with an uncertainty of ±0.05°C.

    For both of these services, calibration can be made at different values if it is requested by the purchaser at the time of purchase. In addition, both of these calibration services can be requested after sensor purchase using a returned material authorization (RMA) number. To request an RMA number, refer to the Repair and Calibration page. 

  3. Note the difference between calibration and a field check. Calibration cannot be done in the field, as it requires an experienced technician and specialized equipment.

    Field checks of measurements can be done to determine if the data make sense with the real-world conditions. Follow these steps to field check a sensor:

    1. Find a second sensor of the same type as the installed sensor whose data is in question. The second sensor will be used as a benchmark sensor and should be known to be accurate or recently calibrated.
    2. At the site, take readings using both sensors under the same conditions. The best practice is to measure both sensors side-by-side at the same time. Note that the sensors will never have the exact same measurement.
    3. Depending on the sensor model, if the difference in the readings of the installed and benchmark sensors is greater than the sum of the accuracies for both sensors, either return the installed sensor to Campbell Scientific for calibration or replace the appropriate chip.
      • The 107, 108, 109, 110PV-L, and BlackGlobe-L temperature sensors can be calibrated.
      • The HC2S3-L and HMP155A-L temperature and relative humidity sensors can be calibrated.
      • The CS215-L has a replaceable chip for temperature and relative humidity. For more information, refer to the “Maintenance and Calibration” section of the CS215 instruction manual.
      • The HMP60-L has a replaceable chip for relative humidity only. For more information, refer to the “Maintenance” section of the HMP60 instruction manual.

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