Sper scientific WBGT User Manual

WBGT Heat Stress Meter

800036

WBGT Heat Stress Meter - 800036

Copyright ©2015 by Sper Scientic

ALL RIGHTS RESERVED. Printed in the USA

The contents of this manual may not be reproduced
or transmitted in any form or by any means electronic,
mechanical, or other means that do not yet exist or may
be developed, including photocopying, recording, or any
information storage and retrieval system without the express

permission from Sper Scientic.

HEAT STRESS REFERENCES:

Refer to any of the following organizations for
current and reliable data regarding heat stress
threshold recommendations and guidelines.

• American Conference of Governmental Industrial
Hygienists (www.acgih.org).

• American Industrial Hygiene Association
(www.aiha.org).

• Canadian Centre for Occupational Health & Safety

(www.ccohs.ca).

• Environmental Protection Agency (www.epa.gov).

• International Organization for Standardization

(www.iso.org).

• National Climatic Data Center (www.ncdc.noaa.gov).

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TABLE OF CONTENTS

INTRODUCTION. . . . . . . . . . . . . . . . 4

FEATURES. . . . . . . . . . . . . . . . . . . 5

MATERIAL SUPPLIED . . . . . . . . . . . . . 5

UNIT DESCRIPTION. . . . . . . . . . . . . . 6

KEYPAD . . . . . . . . . . . . . . . . . . . . 7

LCD DISPLAY . . . . . . . . . . . . . . . . . 8

FUNCTION SELECTIONS . . . . . . . . . . . 9

Display Mode Selection . . . . . . . . . . . 9

Heat Index Measurement . . . . . . . . . 10

Non-Sleep Mode Selection. . . . . . . . . 10

Alarm Threshold Selection . . . . . . . . . .11

Data Analysis. . . . . . . . . . . . . . . . 12

BATTERY REPLACEMENT . . . . . . . . . 13

TROUBLESHOOTING . . . . . . . . . . . . 13

ERROR CODES . . . . . . . . . . . . . . . 14

SPECIFICATIONS . . . . . . . . . . . . . . 15

WARRANTY . . . . . . . . . . . . . . . . . 16

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INTRODUCTION

The Sper Scientic WBGT (Wet Bulb Globe

Temperature) Heat Stress Meter (Model 800036) is
light-weight, portable, and provides the most accurate
determination of the heat stress index based on the

cumulative e󰀨ect of air temperature, air movement,

relative humidity, and radiant heat.

The WBGT Heat Stress Meter provides highly accurate
readings with a typical response time of only 15
seconds. The WBGT Heat Stress Meter provides
settings for both indoor and outdoor activities, and
includes an audible alarm that is adjustable to your
WBGT threshold.

You can use the WBGT Heat Stress Meter almost
anywhere to determine appropriate exposure levels
to high temperatures and avoid heat exhaustion
during athletic events, military exercises, and
industrial activities.

This WBGT Heat Stress Meter comes fully calibrated
from our manufacturing facility, and should maintain
it’s calibration.

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FEATURES

• Light-weight, Portable, and Accurate—Provides

accurate readings with a typical response time
of only 15 seconds, and settings for both
indoor/outdoor activities.

• Threshold Alarm—An audible alarm that is adjustable

to your WBGT threshold.

• Long-Life Battery Operation—An expected battery

life of more than 1000 hours (alkaline) and 250 hours
(general purpose).

• Tripod Mountable—A tripod screw mount for hands-

free monitoring.

• Data Analysis—USB port to connect with a PC for

real-time data analysis. USB cable and data software
sold separately.

MATERIALS SUPPLIED

Meter
Batteries
Instruction Manual

5

UNIT DESCRIPTION

Black Ball Sensor Shell

Sensor

Sensor Cover

Sensor Housing Screws (front
and back of unit)

Tripod Screw (back of unit)

LCD Display

Power/Set, Mode and
Next Buttons

USB Port (side of unit)

Battery Compartment

(back of unit)

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KEY PAD

Press the SET button to turn on/

o󰀨 the unit and to enter the alarm

setting mode.

Press the NEXT button to select a
digit in the alarm setting mode
and to exit the setting mode
when complete.

Press the MODE button to change
the display mode, to select the

+

+

environment mode (IN/OUT), and
to change the values when setting
the alarm mode.

Press the SET and MODE button
simultaneously to select Non-Sleep
mode and prevent the unit from

turning o󰀨 automatically.

Press the NEXT and MODE button
simultaneously to select between
°C & °F temperature scales.

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LCD DISPLAY

WBGT - Wet Bulb
Globe Temperature

A composite temperature

used to estimate the e󰀨ect

of temperature, humidity,
wind chill, and solar
radiation on humans.

TG - Black Globe Temperature

Temperature as measured by a black globe thermometer,

which monitors the e󰀨ects of direct solar radiation on an

exposed surface. This temperature is analogous to what
you feel when standing in the sun.

TA - Air Temperature (Ta)

The standard temperature as normally referenced in
weather observations and forecasts.

% - Relative Humidity

The percentage of water vapor in the air.

IN/OUT - Indoor/Outdoor

Environment with or without direct sun exposure using
the following equations:

Indoor/Outdoor (No Sun): WBGT=0.7 WB + 0.3 TG
Outdoor (Full Sun): WBGT=0.7 WB + 0.2 TG + 0.1 TA

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C/F - Celsius/Fahrenheit

Ambient temperature in either Celsius or Fahrenheit.

- Low Battery Indicator

The low battery icon indicates that you must replace
the batteries.

DP/REC/888 - Unused

These indicators are reserved for use in future models.
Please disregard.

FUNCTION SELECTIONS

This WBGT Heat Stress Meter comes fully calibrated
from our manufacturing facility, and should maintain

it’s calibration.

Display Mode Selection

1. Turn on the meter by pressing the SET button.

The LCD display turns on and the meter enters
measuring mode.

2. Short press the MODE button to select the RH,

WBGT, TA, and TG modes, respectively.

3. Press and hold the MODE button, to select either

IN (for indoor measurements) or OUT (for outdoor
measurements). Each time you press and hold the
MODE button, the LCD display switches between
IN and OUT.

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4. When reading temperature, press the MODE

and NEXT buttons simultaneously to select
between a Celsius (C°) and Fahrenheit (F°)
temperature reading.

Heat Index Measurement

1. Turn on the meter by pressing the SET button. The

LCD display turns on and enters measuring mode.

2. Slide down the sensor protective cover. The LCD

displays the value for the selected display mode
within 15 seconds.

3. When you have completed your readings, slide the

cover back up to its protective position and press the

SET button to turn o󰀨 the unit.

Non-Sleep Mode Selection

To save battery life, the WBGT Heat Stress Meter
turns o󰀨 automatically after 20 minutes of inactivity.
To monitor the environment continuously for longer
periods, you may override this feature:

1. With the meter turned o󰀨, press and hold the SET

and MODE buttons simultaneously for 2 seconds.
The meter displays П and enters Non-Sleep
measurement mode.

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2. When you have completed your readings, slide the

cover back up to its protective position and press
the SET button to turn o󰀨 the unit. Non-Sleep
mode is cancelled and the unit is reset to turn o󰀨
automatically after 20 minutes.

Alarm Threshold Selection

The WBGT Heat Stress Meter features an audible
alarm. You can adjust the alarm values as required
within the range of 68.0°F to 99.0°F (20.0°C to 37.2°C).

If the meter reaches the set alarm value, the unit emits
an audible alarm (continuous beep at about 70dB) to
let you know that your threshold has been exceeded.

The alarm stops when the reading falls below the
set threshold or when you turn o󰀨 the meter. Be sure to
set the unit to WBGT display mode. To set your alarm:

1. With the meter turned o󰀨, press and hold the

SET button for 2 seconds. The LCD displays a

temperature setting with the rst digit ashing.

2. To change the value of the rst ashing digit, press

the MODE button repeatedly.

3. When you have selected the rst value, press the

NEXT button to select the second digit.

4. Press the MODE button repeatedly to change the

value and repeat this step for the third digit.

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5. When you have selected the desired WGBT alarm

value, press and hold the NEXT button for 2 seconds
to set the alarm value and enter measuring mode.

Note…
If you have selected a setting that is out of range
(lower than the current temperature), the LCD will
display OUT under the temperature setting.

Data Analysis

WBGT Heat Stress Meter includes a USB port to
connect your meter to a PC to store, analyze,
and print data.

USB Cable (840054) and the Data Acquisition Software
(840052) are available as optional accessories.

The software interface protocol is 9600 bps, 8 data bits,
with no parity. The communication format transmits
ASCII code every second while the WBGT Heat Stress
Meter is turned on.

Format:

Wxxx.xC(F):Txxx.xC(F):Txxx.xC(F):Hxx.x%LRCCRLF

The rst value represents the WBGT; the second value
represents TA; the third value represents TG; and the

fourth represents the RH.

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BATTERY REPLACEMENT

1. When the meter displays the low battery icon, press

the SET button to turn the unit o󰀨.

2. Open the battery compartment on the back of the unit.

3. Remove the old batteries and replace them with 2

new AAA batteries. Replace the compartment cover.

Battery life is greater than 1000 hours when using
alkaline batteries (250 hours when using general
purpose batteries).

TROUBLE SHOOTING

No Display:

1. Ensure that you have pressed the SET button for

longer than >1 sec.

2. Ensure that the batteries are in good condition,

have proper contact, and are in correct polarity.
When in doubt, replace the batteries. (Refer to
“Battery Replacement.”)

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Display Disappeared:

1. If the low battery indicator displayed before

the display disappeared, replace the batteries.
(Refer to “Battery Replacement.”)

2. Disable the Automatic Power-O󰀨 function and place

the unit in Non-Sleep mode. (Refer to “Non-Sleep
Mode Selection.”)

ERROR CODES

Error Description

Low battery indicator

OUT Out-of-range indicator displayed during

alarm threshold setting.

E02 The value is below the measuring range

or the sensor is installed incorrectly.

E03 The value is above the measuring range.

E04 The original data is in error—value error

or the sensor is installed incorrectly.

E011 RH calibration error.

Please contact our technical support at

quality@sperscientic.com

E033 Fatal circuit error. Return the meter to the

vendor for repair or replacement.

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SPECIFICATIONS

Range Res. Accuracy

±2ºC Indoor
3ºC Outdoor
(-15° to 40ºC)

WBGT

0° to 50°C
32° to 122°F

0.1°C/F

Otherwise
±2.5 Indoor

3.5ºC
Outdoor

Air Temp (TA) ±0.6ºC

Globe Temp
(TG)

0° to 80°C
32° to 176°F

±2ºC
(15º to 35ºC)

±3% RH

Relative
Humidity
(RH)

0 to 100% RH

0.1% RH

(10º to 90%
RH)

Otherwise

±5% RH

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WARRANTY

Sper Scientic warrants this product against defects

in materials and workmanship for period of ve (5)
years from the date of purchase and agrees to repair
or replace any defective unit without charge. If your
model has since been discontinued, an equivalent

Sper Scientic product will be substituted, if available.

This warranty does not cover probes, batteries, battery
leakage, or damage resulting from accident, tampering,
misuse, or abuse of the product. Opening the meter
to expose its electronics will void the warranty.

To obtain warranty service, ship the unit postage
prepaid to:

SPER SCIENTIFIC LTD.

8281 E. Evans Rd, Suite #103

Scottsdale, AZ 85260

The defective unit must be accompanied by a
description of the problem and your return address.
Register your product online at www.sperwarranty.com,
within 10 days.

rev. 6/23/2017

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