Heat Stress WBGT Meter
Contents
1. A map of heat related deaths in St Louis during 1966 for example shows a heavier concentration in the crowded alleys and towers of the inner city where air quality would also be poor during a heat wave The high inner city death rates also can be read as poor access to air conditioned rooms While air conditioning may be a luxury in normal times it can be a lifesaver during heat wave conditions The cost of cool air moves steadily higher adding what appears to be a cruel economic side to heat wave fatalities Indications from the 1978 Texas heat wave suggest that some elderly people on fixed incomes many of them in buildings that could not be ventilated without air conditioning found the cost too high turned off their units and ultimately succumbed to the stresses of heat 7 HT30 en GB V3 5 9 15 Know These Heat Disorder Symptoms Heat Disorder Symptoms Sunburn Redness and pain In severe cases swelling of skin blisters fever headaches Heat Painful spasms usually in muscles of Cramps legs and abdomen possible Heavy sweating Heat Heavy sweating weakness skin cold Exhaustion pale and clammy Pulse thready Normal temperature possible Fainting and vomiting Heat High body temperature 106 F or Stroke higher Hot dry skin Rapid and or strong pulse Possible sunstroke unconsciousness First Aid Ointment for mild cases if blisters appear If breaking occurs apply dry sterile dressing Serious exten2. interface cable This software will allow you to Stream data from the meter to the PC software Data Acquisition For more information contact Extech or refer to the 407752 User s Manual Error Messages An error message will appear on the display if the meter fails an internal diagnostic test E2 The value is under range E3 The value is over range E4 The value is in error E11 RH Calibration error E33 Circuit error Repair replacement necessary A 4 HT30 en GB_V3 5 9 15 Specifications 0 C to 50 C 32 F to 122 F Calculated from measured parameters ZEH GCSE 0 C to 50 C 32 F to 122 F ECTS 3 at 25 C 10 to 9596 RH 0 C to 50 C 32 F to 122 F Meter 254 x 48 7 x 29 4mm 10x1 9x1 1 Black Ball 40mm 35mm 1 57 Dia 1 37H ECTS PC software and cable 407752 5 HT30 en GB V3 5 9 15 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 In the 40 year period from 1936 through 1975 nearly 20 000 people were killed in the United States by the effects of heat and solar radiation In the disastrous heat
3. 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 Individuals at risk should stay in the coolest available place not necessarily indoors Dress for summer Lightweight light colored clothing reflects heat and sunlight and helps your body maintain normal temperatures Put less fuel on your inner fires Foods like proteins that increase metabolic heat production also increase water loss Drink plenty of water or other nonalcoholic fluids Your body needs water to keep cool Drink plenty of fluids even if you don t feel thirsty Persons who 1 have epilepsy or heart kidney or liver disease 2 are on fluid restrictive diets or 3 have a problem with fluid retention should consult a physician before increasing their consumption of fluids Do not drink alcoholic beverages Do not take salt tablets unless specified by a physician Persons on salt restrictive diets should consult a physician before increasing their salt intake Spend more time in air conditioned places Air conditioning in homes and other buildings markedly reduces danger from the heat If you cannot afford an air conditioner spending some time each day during hot weather in an air conditioned environment affords some prote
4. wave of 1980 more than 1 250 people died And those are the direct causalities No one can know how many more deaths are advanced by heat wave weather how many diseased or aging hearts surrender that under better conditions would have continued functioning North American summers are hot most summers see heat waves in one section or another of the United States East of the Rockies they tend to combine both high temperatures and high humidity although some of the worst have been catastrophically dry Considering this tragic death toll the National Weather Service has stepped up its efforts to alert more effectively the general public and appropriate authorities to the hazards of heat waves those prolonged excessive heat humidity episodes Based on the latest research findings the NWS has devised the Heat Index HI sometimes referred to as the apparent temperature The HI given in degrees Fahrenheit is an accurate measure of how hot it really feels when the relative humidity RH is added to the actual air temperature To find the Heat Index look at the Heat Index Chart As an example if the air temperature is 95 F found on the left side of the table and the relative humidity is 55 found at the top of the table the HI or how hot it really feels is 110 F This is at the intersection of the 95 row and the 55 column Important Since HI values were devised for shady light wind conditions exposure to full sunshine can inc
5. EXTECH D INSTRUMENTS Heat Stress WBGT Meter Model HT30 CE 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 Additional features include selectable units of F C Auto power off with override and a built in RS 232 interface with optional 407752 Windows software This meter is shipped fully tested and calibrated and with proper use will provide years of reliable service Meter Description 1 Black Globe temperature sensor 2 RH and Temperature sensors with protective cover 3 LCD display 4 QO SET 5 NEXT 6 MODE amp HEMness Meir Ilar 8 Battery compartment on rear EXTECH VA 7 RS 232 interface DISPLAY Symbol Function WBGT Wet Bulb Globe Temperature TG Black Globe Temperature TA Air Temperature RH Relative Humidity OUT Indoor no sun IN Outdoor in full sun C F Celsius Fahrenheit Low Battery indicator 2 HT30 en GB V3 5 9 15 Meter Operation 1 Press the D SET button to power the instrument on off Slide down the protective sensor
6. cover before taking measurements Press the MODE A 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 To select the preferred temperature unit F or C simultaneously press and release the MODE A and NEXT buttons The F or C icon will appear in the display The meter measures WBGT index with IN or without OUT direct sun exposure Hold down the MODE for more than 1 second to alternate between settings The IN or OUT icon will appear in the display Alarm Setting The HT30 has a user settable heat stress index alarm The HT30 will emit an audible beep when the heat stress index WBGT reaches the level previously set by the user The alarm will continue beep until the measured heat stress index temperature falls below the alarm level set by the user or the meter is turned off The setting range is from 68 0 to 99 0 F 20 0 to 37 2 C 1 o ROI To enter the alarm setup mode hold down the O sET button for more than 2 seconds when turning the meter on The current alarm setting will be displayed with the most significant digit blinking Use the MODE A button to increment the digit To set the next digit momentarily press the NEXT button After all of the digits are set press and hold the NEXT button for 2 seconds to return to the measuring mod
7. ction Don t get too much sun Sunburn makes the job of heat dissipation that much more difficult Copyright 2013 2015 FLIR Systems Inc All rights reserved including the right of reproduction in whole or in part in any form 1SO 9001 Certified www extech com 9 HT30 en GB_V3 5 9 15
8. e NOTE The OUT icon will appear in the display If the new setting is out of the setting range of the alarm 3 HT30 en GB V3 5 9 15 Auto Power Off The Auto Power Off feature automatically turns the meter off after approximately 20 minutes To disable this feature hold down the O sET and MODE A 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 A appears in the bottom left hand corner of the LCD display To replace the battery 1 Open the battery compartment on the back of the meter 2 Replace the two AAA batteries and close the compartment 3 You as the end user are legally bound Battery ordinance to return all used batteries and accumulators disposal in the household garbage is prohibited You can hand over your used batteries accumulators at collection points in your community or wherever batteries accumulators are sold Disposal Follow the valid legal stipulations in respect of the disposal of the device at the MEE nd of its lifecycle RS 232 PC Interface The RS 232 serial data port 3 5mm phono jack is located on the right side of the meter The PC interface hardware is intended for use with the Extech software package Part Number 407752 which includes Windows compatible software and PC
9. icals like sodium and chloride onto the surface of the skin Too Much Heat Heat disorders generally have to do with a reduction or collapse of the body s ability to shed heat by circulatory changes and sweating or a chemical salt imbalance caused by too much sweating When heat gain exceeds the level the body can remove or when the body cannot compensate for fluids and salt lost through perspiration the temperature of the body s inner core begins to rise and heat related illness may develop Ranging in severity heat disorders share one common feature the individual has overexposed or overexercised for his her age and physical condition in the existing thermal environment Sunburn with its ultraviolet radiation burns can significantly retard the skin s ability to shed excess heat Studies indicate that other things being equal the severity of heat disorders tend to increase with age heat cramps in a 17 year old may be heat exhaustion in someone 40 and heat stroke in a person over 60 Acclimatization has to do with adjusting sweat salt concentration among other things The idea is to lose enough water to regulate body temperature with the least possible chemical disturbance Cities Pose Special Hazards The stagnant atmospheric conditions of the heat wave trap pollutants in urban areas and add the stresses of severe pollution to the already dangerous stresses of hot weather creating a health problem of undiscovered dimensions
10. rease HI values by up to 15 F Also strong winds particularly with very hot dry air can be extremely hazardous Note on the HI chart the shaded zone above 105 F This corresponds to a level of HI that may cause increasingly severe heat disorders with continued exposure and or physical activity How temperature and humidity combine to make it feel hotter a Extreme Danger Mm Danger Extreme Caution Caution RELATIVE HUMIDITY PERCENT 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 Apparent temperature Is how hot the heat hurnidity Combination makes it feel 88 89 91 AIR TEMPERATURE DEGREES FAHRENHEIT 69 69 70 71 72 72 73 73 74 74 75 75 76 76 77 77 78 78 72 79 80 64 64 65 65 66 66 67 68 68 69 69 70 70 70 71 71 1 71 71 71 72 6 HT30 en GB_V3 5 9 15 Heat Index Heat Disorders Heat Index Heat Disorders Heat Possible heat disorders for Index people in higher risk groups 130 F or H A higher eatstroke sunstroke highly likely with continued exposure 105 Sunstroke heat cramps or heat exhaustion likely and heatstroke 130 F possible with prolonged exposure and or physical activity 90 Sunstroke heat cramps and heat exhaustion possible with prolonged 105 F exposure and or physical activity 80 90 F Fatigue possible with p
11. rolonged exposure and or physical activity The Heat Index Heat Disorders table relates ranges of HI with specific disorders particularly for people in the higher risk groups How Heat Affects the Body Human bodies dissipate heat by varying the rate and depth of blood circulation by losing water through the skin and Sweat glands and as the last extremity is reached by panting when blood is heated above 98 6 degrees The heart begins to pump more blood blood vessels dilate to accommodate the increased flow and the bundles of tiny capillaries threading through the upper layers of skin are put into operation The body s blood is circulated closer to the skin s surface and excess heat drains off into the cooler atmosphere At the same time water diffuses through the skin as perspiration The skin handles about 90 percent of the body s heat dissipating function Sweating by itself does nothing to cool the body unless the water is removed by evaporation and high relative humidity retards evaporation The evaporation process itself works this way the heat energy required to evaporate the sweat is extracted from the body thereby cooling it Under conditions of high temperature above 90 degrees and high relative humidity the body is doing everything it can to maintain 98 6 degrees inside The heart is pumping a torrent of blood through dilated circulatory vessels the sweat glands are pouring liquid including essential dissolved chem
12. sive cases should be seen by a physician Firm pressure on cramping muscles or gentle massage to relieve spasm Give sips of water If nausea occurs discontinue use Get victim out of sun Lay down and loosen clothing Apply cool wet cloths Fan or move victim to air conditioned room Sips of water If nausea occurs discontinue use If vomiting continues seek immediate medical attention Heat stroke is a severe medical emergency Summon medical assistance or get the victim to a hospital immediately Delay can be fatal Move the victim to a cooler environment Reduce body temperature with cold bath or sponging Use extreme caution Remove clothing use fans and air conditioners If temperature rises again repeat process Do not give fluids WARNING Sudden temperature and humidity changes e g going indoors to outdoors may cause inaccurate Temperature Humidity and Heat Index readings for up to 45 minutes Until readings stabilize e g stop steadily increasing or decreasing users should NOT rely on the Temperature Humidity or Heat Index readings of this meter or on the meter s alarm function in regards to such readings This meter is NOT a medical device and users should NEVER rely on readings for medical purposes 8 HT30 en GB_V3 5 9 15 Preventing Heat Related Illness Elderly persons small children chronic invalids those on certain medications or drugs especially tranquilizers and anticholinergics and
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