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The WBGT (Wet Bulb Globe Temperature) climate index is determined using the WBGT probe in
accordance with DIN 33403 and ISO 7243. The WBGT index is used to determine the maximum
permissible exposure time at high-temperature workplaces (e.g. steel industry, foundries, glass
industry or blast furnaces).
3 different temperatures have to be measured to calculate
WBGT:
- Radiation temperature T
g
- Ambient temperature T
a
- Humidity temperature T
nw
(temperature of a naturally
ventilated psychrometer)
Note: Ensure that the water container
to measure humidity temperature
is sufficiently filled.
To carry out the measurement, connect the following:
Socket 1: Connection cable of globe thermometer (T
g
)
Socket 2: Connection cable of ambient and
humidity temperature probe (T
a
, T
nw
)
Switch on instrument: WBGT appears in the display
Calculate using the following formulae:
WBGT = 0.7 x T
nw
+ 0.3 x T
g
WBGTS = 0.7 x T
nw
+ 0.2 x T
g
+ 0.1 x T
a
(with influence of solar radiation)
Downloading using testo Comsoft software
Duct assignment is as follows:
Duct: K:1 K:2 K:3 K:4 K:5
Unit: °C °C °C °C °C
Assignment: T
g
T
nw
T
a
WBGT WBGTS
WBGT measurement
T
a
T
g
T
nw
12
T
g
T
a
, T
nw
Location
40.0
Tg °C
20.5
Tnw °C
22.3
Ta ° C
Ensure that the specified instrument and cable temperatures are not exceeded.
You should work with extension cables, particularly in the case of high radiation
temperatures.
26.4
WBGT °C
36.6
WBGTS °C
Cu-CuNi NTC NTC
(Type T)
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