Exercise on Heat Stress Monitoring

Question 0

WBGT Index Determination Using the Metrosonics Heat Stress Monitor

Answer 0

1 Place the electronic heat stress monitor in the designated area for heat stress monitoring
2 Turn on the electronic heat stress monitor
3 After five minutes of stabilization, take the wet bulb and globe temperatures by pressing the appropriate buttons on the instrument. Take note of the time of measurement.
4 Record results
5 Compute for the WBGT Index using the formula provided
6 Determine the work load and work/rest regimen appropriate for the WBGT Index

Question 1

Materials and equipment

Answer 1

1 Electronic heat stress monitor
2 Heat stress survey form
3 Calculator

Question 2

WBGT

Answer 2

Wet Bulb Globe Temperature Index

Question 3

NWB

Answer 3

Natural Wet Bulb Temperature

Question 4

DB

Answer 4

Dry Bulb Temperature

Question 5

GT

Answer 5

Globe Temperature

Question 6

WBGT Determination for indoor and outdoor conditions with no solar load

Answer 6

WBGT = 0.7NWB + 0.3GT

Question 7

WBGT Determination for outdoor conditions with solar load

Answer 7

WBGT = 0.7NWB + 0.2GT + 0.1DB

Question 8

Average WBGT

Answer 8

Summation of (WBGT)(t)/Summation of t

Question 9

Interpretation of permissible heat exposure threshold limit values

Answer 9

(Review)

Question 10

Used where the WBGT of the work area is different from that of the rest area

Answer 10

Time-weighted average

Question 11

Bases of threshold limit values

Answer 11

1 Assumption that nearly all acclimatized, fully clothed workers with adequate water and salt intake should be able to function effectively under the given working conditions without exceeding a deep body temperature of 38 Celsius (100.4 Fahrenheit)
2 Assumption that the WBGT of the resting place is the same or very close to that of the workplace