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HW30 Heat Watch Patent Pending
HW30 v2.3 6/04
TIMER MODE (see diagram)
The HW30 Heat Watch timer mode is a
user programmable countdown timer.
The maximum count down time is 9
hours 59 minutes and 59 seconds. The
minimum settable time is 1 second.
Press START to begin the countdown
Press STOP to stop the countdown
The timer will count down for the
selected duration.
The watch will emit an audible warning
during the final 5 seconds of the
countdown.
The countdown will repeat itself until
stopped by the user. The countdown
sequence will repeat itself and
increment the timer count by one each
time it resumes.
ALARM MODE (see diagram)
The alarm will ring for 30 seconds.
The alarm can be stopped by pressing
any of the buttons
Battery Replacement
Remove the screws from the back of the watch to open unit and battery compartment. The
battery is a Round Button cell Type CR2032. Removing and replacing the battery will cause
loss of all previous settings. Make sure the gasket seal is properly placed before replacing
back cover and tightening screws.
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 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 increase 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.
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.
80° - 90°F Fatigue possible with prolonged 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.
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 watch, or on the watches alarm function in regards to such readings.
This watch is NOT a medical device and users should NEVER rely on readings for
medical purposes.
Warranty
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of
defects in parts and workmanship for one year from date of shipment (a six month
limited warranty applies on sensors and cables). If it should become necessary to
return the instrument for service during or beyond the warranty period, contact the
Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our
website at www.extech.com
(click on ‘Contact Extech’ and go to ‘Service Department’
to request an RA number). A Return Authorization (RA) number must be issued
before any product is returned to Extech. The sender is responsible for shipping
charges, freight, insurance and proper packaging to prevent damage in transit. This
warranty does not apply to defects resulting from action of the user such as misuse,
improper wiring, operation outside of specification, improper maintenance or repair, or
unauthorized modification. Extech specifically disclaims any implied warranty of
merchantability or fitness for a specific purpose and will not be liable for any direct,
indirect, incidental or consequential damages. Extech's total liability is limited to repair
or replacement of the product. The warranty set forth above is inclusive and no other
warranty, whether written or oral, is expressed or implied.
Copyright © 2003 Extech Instruments Corporation
All rights reserved including the right of reproduction in whole or in part in any
form.