Extech Instruments Hw30 Users Manual Heat Watch Vendor Version

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HW30 Heat Watch Patent Pending
HEAT INDEX MODE

Description
Recall

Mode

Lap/Split

Start/Stop

LCD Display

Introduction
Congratulations on your purchase of the Extech HW30 Heat Watch. Careful use of
this item will provide years of reliable service.
Specifications
Accuracy (Watch) ±5 seconds/24 hours
Accuracy (RH)
±5% (33 to 75% RH), ±7% (1 to 32% and 76 to 99%)
Accuracy (Temp)
±3°F (1.5°C)
Temperature
14 to 122°F (-10 to 50°C)
Resolution
0.1/ 1o C or F
Update Rate
5 seconds in Heat Index Mode, 2 minutes in other modes
Heat Index
70 to 122°F (22 to 50°C)
Humidity
1 to 99% RH
Memory
30 Laps/ 30 Splits
LAP Counter
99 Laps
Battery
CR2032
Dimensions
3.1x2.6x0.8" (79x66x23mm)
Weight
3 oz. (85g) with battery
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
Operation
Mode Selection
The HW30 Heat Watch has six different operating modes.
Press the MODE button to switch from one mode to another.
The HW30 will remain in the Heat Index mode for two minutes and then default back to the
clock mode.

Time Date Mode
The time date display
shows current time, day
of week,
date and month. Also displayed are the
alarm and heat index alarm
indicators when they are activated.
Time and date set
Press and hold the RECALL button for 3
seconds to set time and date.
Press START to zero seconds.
Press LAP to select minutes, Press
START to change minutes.
Press LAP to select hours, Press START
to change hours.
Press LAP to select minutes, Press
START to change minutes.
Press LAP to select year, Press START
to change year.
Press LAP to select month, Press START
to change month.
Press LAP to select date, Press START
to change date.
Press LAP to select 12H/24H, Press START to change.
Press RECALL to exit time set mode.
The HW30 will return to display mode after 30 seconds of inactivity.

In heat index mode the HW 30 displays
relative humidity and ambient temperature
(in °F or °C). Using these two readings, the
HW30 also calculates and displays the
Heat Index. (Please visit our web site for
more information on heat index and the
effects of excessive heat on the human
body.)
SETTING UNITS OF MEASURE
From heat index mode screen
Press LAP to change unit of measure (°F or °C)
HEAT INDEX ALARM SET
The HW30 Heat Watch has a user settable heat index alarm. The Heat Watch will emit a 20
second audible warning when the heat index reaches the level previously set by the user.
To set the alarm
From heat index mode screen
Press and hold RECALL for 3 seconds
Press START to scroll up or LAP to scroll down
Press RECALL to save and exit setup mode.
Or Press START if the alarm level has already been set
The alarm can be stopped by pressing any of the four buttons.
STOPWATCH LAP MODE

Before using be sure to reset stopwatch to
0.00.00.00.
The HW30 Heat Watch lap mode has advanced
features that will make the timing of events or
training sessions easier and more enjoyable.
1. Lap Indicator
The lap indicator flashes to indicate the lap in
progress up to 99 laps.
When LAP is pushed, the lap indicator and lap
time displays (top line of display) freeze for ten
seconds before resuming and displaying next
lap. Bottom display always shows cumulative
time
2. Fastest Lap/Slowest Lap/Average Lap Recall
Once timing session is complete, press
RECALL button to review fastest lap, slowest
lap and average lap times. (based on 99 laps)
Then press START to review individual lap times. (30 laps)
Lap times are shown on top line of the display.
Split times are shown on the bottom line of the display.
3. Memory
The HW30 Heat Watch memory can store up to 30 lap (and split) times.
For detailed instructions on the operation of the lap functions, please refer to the diagram)
STOPWATCH SPLIT MODE

Before using be sure to reset stopwatch to
0.00.00.00.
The HW30 Heat Watch split mode has advanced
features that will make the timing of events or
training sessions easier and more enjoyable.
1. Split time indicator
When SPLIT is pushed the split indicator and
split time displays (top line of display) freeze to
indicate the current split time. Bottom display
continues to always show cumulative time.
2. Fastest Lap/Slowest Lap/Average Lap Recall
Once timing session is complete, press
RECALL button to review fastest lap, slowest
lap and average lap times. (based on 99 laps)
Then press START to review split times. (30
splits)
Split times are shown on the bottom line of the
display. Lap times are shown on top line of the display.
3. Memory
The HW30 Heat Watch memory can store up to 30 split (and lap) times.

HW30 v2.3 6/04

HW30 Heat Watch Patent Pending
Heat Index / Heat Disorders
TIMER MODE (see diagram)
Heat Index / Heat Disorders
Heat Index
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.

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.

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.

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.

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.

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.

HW30 v2.3 6/04



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