Heat Stress WBGT (Wet Bulb Globe Temperature) Meter Extech HT200

Several international reference bodies recommend their quantification by calculating the WBGT (Wet Bulb Globe Temperature) index, which measures the globe temperature, the natural wet temperature and the mean radiant temperature, expressing the value in ° C (degrees Celsius).

The HT200 meter allows precise measurements of the following:

• WBGT - Wet Bulb Globe Temperature (w/o sunlight);
• WBGT - Wet Bulb Globe Temperature (w/sunlight);
• TG - Black Globe Temperature;
• TA - Air Temperature;
• Relative humidity;
• Wet Bulb (WT);
• Dew Point (DEW)

The thermal stress index measures the sensation of heat when the humidity is combined with the temperature, the movement of the air and the radiant heat. The HT200 stores up to 50 readings. Includes 9V battery, protective case and power supply.

Key Features:

• Meter accurately determines the Heat Stress level by factoring a combination of humidity, temperature, air movement, and direct solar radiation
• Uses a capacitance sensor to accurately measure Wet Bulb Globe Temperature (WBGT), Black Globe Temperature (TG), Relative Humidity (%RH), Air Temperature (TA), Wet Bulb (WT) and Dew Point (DEW)
• Black Globe Temperature (TG) monitors the effects of direct solar radiation on an exposed surface
• In/Out function displays the WBGT value with or without direct sun exposure
• WBGT high/low alarm settings
• Min/Max, Data Hold, Auto Power Off, Low battery indicator
• Complete with 9V battery and hard carrying case

• WBGT - Wet Bulb Globe Temperature (w/o sunligh: 
  • Range: 0 to 59°C, (32 to 138°F)
  • Resolution: 0,1°C/°F
  • Accuracy: ±1°C, 1.8°F
• WBGT - Wet Bulb Globe Temperature (w/sunlight):
  • Range: 0 to 56°C, (32 to 132°F)
  • Resolution: 0,1°C/°F
  • Accuracy: ±1,5°C, 2.7°F
• TG - Black Globe Temperature:
  
  • Range: 0 to 80°C, (32 to 176°F)
  • Resolution: 0,1°C/°F
  • Accuracy: ±0,6°C, 1.1°F
• TA - Air Temperature:
  
  • Range: 0 to 50ºC, (32 to 122ºF)
  • Resolution: 0,1°C/°F
  • Accuracy: ±0,8°C, 1.5°F
• Relative Humidity:
  
  • Range: 1 to 99% hr
  • Resolution: 0,1% hr
  • Accuracy: ±3% hr
• Dew Point:
  
  • Range: -35.3 to 48.9°C (-31.5 to 120.1°F)
  • Resolution: 0,1°C
• Wet Bulb:
  
  • Range: -21.6 to 50°C
  • Resolution: 0,1°C

Other technical data

• Dimensions: 
  • Instrument: 300 x 70 x 50mm (11.8 x 2.8 x 2")
  • Black Ball : Ø50 mm, (2")
• Battery life > 200 hours
• The thermal stress index measures the sensation of heat with the built-in Temperature and Humidity Probe
• Display 52 mm (L) x 36 mm (C) [2,05 in (L) x 1,42 in (C)] with backlit

These variables arise in the form of energy such as temperature and humidity, luminosity and noise. However the human being has limits with respect to the tolerance of these parameters, being able to arise situations of danger from certain levels. It is in this context that we intend to explore the environmental variables that contribute to thermal stress due to heat in workplaces. Wet Bulb Globe Temperature (WBGT) is used to evaluate the work places affected by thermal radiation, as well as to determine the maximum allowed exposure time.