Delta OHM HD32.2, Manual

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In the following table are indicated the limit values of the WBGT thermal stress index taken from
ISO 7243 regulation:
LEVEL CLASS
METABOLIC
METABOLIC LEVEL, M WBGT LIMIT VALUE
RELATIVE TO A
SINGLE SKIN
SURFACE
W/m
2
TOTAL (FOR A
MEDIUM AREA OF
1,8 m
2
SKIN SUR-
FACE
W
ACCLIMATIZED BEING TO
HEAT
°C
PERSONA NON ACCLIMATATA
AL CALORENON- ACCLIMA-
TIZED BEING TO HEAT
°C
0
(RESTING)
M ≤ 65 M ≤ 117 33 32
1 65 < M ≤ 130 117 < M ≤ 234 30 29
2 130 < M ≤ 200 234 < M ≤ 360 28 26
3 200 < M ≤ 260 360 < M ≤ 468
STAGNANT
AIR
25
NO STAGNANT
AIR
26
STAGNANT
AIR
22
NO STAGNANT
AIR
23
4 M > 260 M > 468 23 25 18 20
NOTE: THE VALUES ARE STABILIZED, CONSIDERING A MAXIMUM RECTAL TEMPERATURE OF
38° C FOR THE CONSIDERED BEINGS.
To calculate WBGT index, it’s necessary that to the instrument are connected:
•
HP3201.2 or HP3201 temperature probe with natural ventilation wet bulb.
•
TP3276.2 or TP3275 globe thermometer.
•
TP3207.2 or TP3207 wet bulb temperature probe if the detection is made in presence
of solar irradiation.
To measure WBGT index consider the following regulations:
•
ISO 7726
•
ISO 7243