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What is Wet-Bulb Globe Temperature?
Wet-Bulb Globe Temperature (WBGT) is a summer heat index that indicates
the level of severity of heat. In addition to the air temperature, the calculations
of this heat index take into account humidity (which affects sweating) and
forms of radiant heat such as solar radiation and reflected heat. The index is
calculated from dry-bulb temperature (ambient temperature), wet-bulb
temperature (related to humidity) and black globe temperature (related to
radiant heat). The result is expressed as a temperature in Celsius (℃).
This device measures the dry-bulb temperature with a thermistor and calculates the
wet-bulb temperature from the dry-bulb temperature and a relative humidity value
measured with a humidity sensor. The black globe temperature is calculated by
converting the temperature measured with a 33mm-wide black globe to the
equivalent value for a standard 150mm-wide black globe. This device also uses the
difference between the dry-bulb temperature (ambient temperature) and black globe
temperature to predict whether the user is outside (where there is solar radiation) or
inside (where there is no solar radiation). The WBGT is then displayed according to
this automatic judgment.
Safety Notes
Warning
Caution
This mark indicates actions that are prohibited.
This mark indicates instructions that must always be followed.
This section explains precautionary measures to be taken to avoid injury to the users
of this device and others, and to prevent damage to property. Please familiarize
yourself with this information to ensure safe operation of this equipment.
Failure to follow instructions highlighted with this mark
could result in death or severe injury.
Failure to follow instructions highlighted with this mark
could result in injury or damage to property.
Outside (with solar radiation):
0.7 x wet-bulb temperature + 0.2 x black globe temperature + 0.1 x dry-bulb temperature
Inside (no solar radiation):
0.7 x wet-bulb temperature + 0.3 x black globe temperature
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