User's Manual Heat Stress WBGT Meter Model HT30
Introduction Congratulations on your purchase of Heat Stress WBGT (Wet Bulb Globe Temperature) Meter. This meter measures and displays Heat Stress Index (WBGT), which is how hot it feels when humidity is combined with temperature, air movement, and direct or radiant sunlight. Black Globe Temperature (TG) monitors the effects of direct solar radiation on an exposed surface. It also measures air temperature (TA) and Relative Humidity (RH).
Meter Operation 1. 2. Press the /SET button to power the instrument on/off. Slide down the protective sensor cover before taking measurements. 3. Press the MODE/button to select the desired display mode: Wet Bulb Globe Temperature Heat Index (WBGT), Air Temperature (TA), Black Globe Temperature (TG), or Relative Humidity (RH). An icon will appear in the display indicating the current selection.
Auto Power Off The Auto Power Off feature automatically turns the meter off after approximately 20 minutes. To disable this feature, hold down the /SET and MODE/for 2 seconds when powering on the meter. The meter will momentarily display an “n” and enter measuring mode. The meter will reset to auto power off mode when it is powered off. Battery Replacement When it is time to replace the batteries, the low battery indicator corner of the LCD display. To replace the battery: 1.
Specifications Wet Bulb Globe Temperature (WBGT) 0°C to 50°C (32°F to 122°F) WBGT Accuracy Calculated from measured parameters TG Black Globe Temperature range 0 to 80°C (32°F to 176°F) TG Accuracy Indoor ±2°C (4°F) Outdoor ±3°C (5.5°F) TA Air Temperature range 0°C to 50°C (32°F to 122°F) TA Accuracy ±1°C (1.8°F) Relative Humidity (RH) 0 to 100%RH RH Accuracy ±3% (at 25°C, 10 to 95%RH) Resolution 0.1°F/°C; 0.
APPENDIX The following is reprinted with permission of the National Oceanic and Atmospheric Administration. A National Problem Heat kills by taxing the human body beyond its abilities. In a normal year, about 175 Americans succumb to the demands of summer heat. Among the large continental family of natural hazards, only the cold of winter -- not lightning, hurricanes, tornadoes, floods, or earthquakes -- takes a greater toll.
Heat Index / Heat Disorders Heat Index / Heat Disorders Heat Index Possible heat disorders for people in higher risk groups 130°F or higher Heatstroke/sunstroke highly likely with continued exposure. 105° 130°F Sunstroke, heat cramps or heat exhaustion likely, and heatstroke possible with prolonged exposure and/or physical activity. 90° 105°F Sunstroke, heat cramps and heat exhaustion possible with prolonged exposure and/or physical activity.
Know These Heat Disorder Symptoms Heat Disorder Symptoms First Aid Sunburn Redness and pain. In severe cases, swelling of skin, blisters, fever, headaches. Ointment for mild cases if blisters appear. If breaking occurs, apply dry sterile dressing. Serious, extensive cases should be seen by a physician. Heat Cramps Painful spasms usually in muscles of legs and abdomen possible. Heavy sweating. Firm pressure on cramping muscles, or gentle massage to relieve spasm. Give sips of water.
Preventing Heat-Related Illness Elderly persons, small children, chronic invalids, those on certain medications or drugs (especially tranquilizers and anticholinergics), and persons with weight and alcohol problems are particularly susceptible to heat reactions, especially during heat waves in areas where moderate climate usually prevails. Heat Wave Safety Tips Slow down. Strenuous activities should be reduced, eliminated, or rescheduled to the coolest time of the day.