Datasheet

Omron’s Environment Sensor assists you in maintaining
a comfortable living environment
Discomfort IndexHeatstroke Risk Levels
Heatstroke risk level is
determined by air temperature and humidity.
Users can estimate the risk of
heat while performing day-to-day activities.
The discomfort index is calculated from
the air temperature and humidity to help users
realize the importance of
maintaining a comfortable environment.
Relative humidity (%)
Air temperature (°C) (dry bulb temperature)
Humidity (%)
Reference
temperature
WBGT*
Heat stress precautions Awareness guide
Danger
31°C or above
(88°F or above)
Dangerous heat for
all activities.
Especially dangerous to senior citizens,
even if they are just resting.
Avoid going outside and stay indoors in
cooler places.
Severe warning
28°C – 31°C
(82°F – 88°F)
Stay out of the blazing sun and be aware
of indoor ambient temperature rise.
Warning
25°C – 28°C
(77°F – 82°F)
Dangerous heat for activities
that involve moderate to
strenuous physical exercises.
Take adequate rest periods during physical
training and strenuous work.
Caution
Below 25°C
(
Below 77°F)
Dangerous heat for
activities that involve
vigorous physical exercises.
Risk is low but still exists on the basis of
vigorous exercises and hard labor.
[Guideline for action limits]
DI=0.81T+0.01H(0.99T-14.3)+46.3
DI: Discomfort Index T: Temperature (°C) H: Humidity (%)
Discomfort index Thermal comfort
65 – 70 Comfortable
70 – 75 Neutral
75 – 80 Warm
80 – 85 Uncomfortably hot (sweating)
85 – Severe heat
20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
40 29 30 31 32 33 34 35 35 36 37 38 39 40 41 42 43 44
39 28 29 30 31 32 33 34 35 35 36 37 38 39 40 41 42 43
38 28 28 29 30 31 32 33 34 35 35 36 37 38 39 40 41 42
37 27 28 29 29 30 31 32 33 34 35 35 36 37 38 39 40 41
36 26 27 28 29 29 30 31 32 33 34 34 35 36 37 38 39 39
35 25 26 27 28 29 29 30 31 32 33 33 34 35 36 37 38 38
34 25 25 26 27 28 29 29 30
31 32 33 33 34 35 36 37 37
33 24 25 25 26 27 28 28 29 30 31 32 32 33 34 35 35 36
32 23 24 25 25 26 27 28 28 29 30 31 31 32 33 34 34 35
31 22 23 24 24 25 26 27 27 28 29 30 30 31 32 33 33 34
30 21 22 23 24 24 25 26 27 27 28 29 29 30 31 32 32 33
29 21 21 22 23 24 24 25 26 26 27 28 29 29 30 31 31 32
28 20 21 21 22 23 23 24 25 25 26 27 28 28 29 30 30 31
27 19 20 21 21 22 23 23 24 25 25 26 27 27 28 29 29
30
26 18 19 20 20 21 22 22 23 24 24 25 26 26 27 28 28 29
25 18 18 19 20 20 21 22 22 23 23 24 25 25 26 27 27 28
24 17 18 18 19 19 20 21 21 22 22 23 24 24 25 26 26 27
23 16 17 17 18 19 19 20 20 21 22 22 23 23 24 25 25 26
22 15 16 17 17 18 18 19 19 20 21 21 22 22 23 24 24 25
21 15 15 16 16 17 17 18 19 19 20 20 21 21 22 23 23 24
Temperature (°C)
25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
0 66 67 68 68 69 70 71 72 73 73 74 75 76 77 77 78 79 80 81 81 82
5 67 67 68 69 70 71 72 73 73 74 75 76 77 78 79 79 80 81 82 83 84
10 67 68 69 70 71 72 73 73 74 75 76 77 78 79 80 81 82 83 83 84 85
15 68 69 70 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87
20 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88
25 69 70
71 72 73 74 75 76 77 78 79 80 81 82 83 85 86 87 88 89 90
30 69 70 71 73 74 75 76 77 78 79 80 81 82 84 85 86 87 88 89 90 91
35 70 71 72 73 74 75 77 78 79 80 81 82 84 85 86 87 88 89 91 92 93
40 70 71 73 74 75 76 77 79 80 81 82 83 85 86 87 88 90 91 92 93 94
45 71 72 73 75 76 77 78 80 81 82 83 85 86 87 88 90 91 92 93
50 71 73 74 75 76 78 79 80 82 83 84 86 87 88 90 91 92 93
55 72 73 75 76 77 79 80 81 83
84 85 87 88 89 91 92 93
60 72 74 75 77 78 79 81 82 84 85 86 88 89 91 92 93
65 73 74 76 77 79 80 82 83 84 86 87 89 90 92 93
70 73 75 76 78 79 81 82 84 85 87 88 90 91 93 94
75 74 75 77 79 80 82 83 85 86 88 89 91 93 94
80 74 76 78 79 81 82 84 86 87 89 90 92 94
85 75 77 78 80 82 83 85 86 88 90 91 93
90 75 77 79 81 82 84 86 87 89 91 92 94
95 76 78 79 81 83 85 86 88 90 92 93
100 77 78 80 82 84 86 87 89 91
93
Temperature Humidity Temperature Humidity
*WBGT: The Wet Bulb Globe Temperature is a measure of the heat stress in direct sunlight that
can be used to monitor environmental and working conditions and is the basis for an
international standard (e.g. ISO)
Excerpt from the Ministry of the Environment website Heat
Illness Prevention Information about the “heat stress index
(WBGT)”
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