HD35
- 80 -
V1.12
9.9
WBGT
INDEX MEASUREMENT
HD35EDWWBGT can contemporarily detect the following quantities:
•
Globe thermometer temperature Tg
•
Natural ventilation wet bulb temperature Tnw
•
Ambient temperature Ta
On the basis of the detected measurements, the instrument can calculate:
•
WBGT
indoor
index: WBGT index in absence of solar irradiation.
WBGT
indoor
= 0.7 Tnw + 0.3 Tg
•
WBGT
outdoor
index: WBGT index in presence of solar irradiation.
WBGT
outdoor
= 0.7 Tnw + 0.2 Tg + 0.1 Ta
The WBGT (Wet Bulb Globe Temperature) index is one of the indexes used for determining the
thermal stress to which an individual is submitted to in a warm environment. For WBGT index
measurement, refer to ISO 7243 standard.
To calculate WBGT index according to ISO 7243 standard, it’s necessary that to the instrument
are connected:
•
TP3501TC2 or TP3204 natural ventilation wet bulb temperature probe.
•
TP3576TC2 or TP3575TC2 globe thermometer.
•
TP3507TC2 dry bulb temperature probe if the detection is made in presence of solar
irradiation.
Preparation of the TP3576TC2 or TP3575TC2 globe thermometer:
Preparation of the TP3501TC2 wet bulb temperature probe:
1.
Remove the cover (the cover is not screwed).
2.
Insert the cotton wick, previously dipped with distilled water, into the temperature probe.
The cotton wick must protrude from the probe for about 20 mm.
3.
Fill the container up till ¾ with distilled water.
4.
Close the container with the cover.
Summary of Contents for HD35AP series
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