Full Text Searchable PDF User Manual
3M Occupational Health and Environmental Safety Division
3M
TM
WIBGET
TM
Heat Stress Monitor WB-300
WIBGET WB-300 User Manual
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i Dangers, warnings and cautions
3M
TM
WIBGET
TM
Heat Stress Monitor WB-300 User Manual
Dangers, warnings and cautions
Danger!
Failure to observe the following procedures may result in serious personal injury
• This instrument is not intrinsically safe, do not use in hazardous locations.
Warning!
Failure to observe the following procedures could damage the instrument
• Read the manual before operation.
• Do not store in temperatures exceeding 100°C (212 °F)
• Do not immerse in liquids.
• Condensation may damage your instrument.
• Substitution of components may impair the accuracy of the instrument. Repair should
be completed by authorized service personnel only.
Caution!
General
• Replacement of 9-V alkaline battery only in a non-hazardous locations.
• If recharging with a NiHM Battery pack, recharge only in a non-hazardous environment.
• A non-condensing environment is required for proper measurements.
• Do not charge battery outside the range of 0°C to 40°C (32°F to 104°F).
• Battery run-time may be reduced when operating at lower than 0°C (32°F)
temperatures.
Intended Use
The WIBGET WB-300 is intended to measure environmental temperatures for heat
stress analysis. Consult your company’s safety professional for local standards, or call 3M
at 1-800-243-4630.
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Table of Contents
Up and Running .........................................................................................................................3
Check wick and fill natural wet bulb ..........................................................................................3
Keypad Operation ......................................................................................................................4
Sensors
.....................................................................................................................................
5
Natural Wet Bulb Thermometer ................................................................................................
5
Globe Thermometer .................................................................................................................
5
Dry Bulb Thermometer .............................................................................................................
5
Measurements ...........................................................................................................................6
Wet Bulb Globe Temperature ...................................................................................................6
Displayed Data ..........................................................................................................................6
Setup ..........................................................................................................................................
7
Placing the WB-300 on-site for monitoring/testing ...................................................................
7
Operational Check .....................................................................................................................8
Power Options ...........................................................................................................................8
8
..........................................8
9
9
9
9
9
9
9
9
9
9
9
9
9
10
10
.......................................11
12
12
12
9-V Alkaline Battery Replacement ..........................................................................................
NiMH Battery Pack ..............................................................................
Appendix A: Specifications ......................................................................................................
Measurements ..........................................................................................................................
Languages
.................................................................................................................................
Housing ......................................................................................................................................
Size ............................................................................................................................................
Weight ......................................................................................................................................
Sensor Types .............................................................................................................................
Accuracy ...................................................................................................................................
Operating Temperature Range ..................................................................................................
Power Options ..........................................................................................................................
Battery Life ................................................................................................................................
Charge Time (NiMH Battery Pack) ...........................................................................................
Safety Approvals and Special Conditions .................................................................................
Appendix B: Heat Exposures Tables .......................................................................................
ACGIH ......................................................................................................................................
PHEL Curves (Total Exposure Time in Hours: Minutes)..................
Product Information .................................................................................................................
Accessories
.............................................................................................................................
Warranty ..................................................................................................................................
Figures
Figure 1: Wet bulb and maintenance ..........................................................................................4
Figure 2: Keypad keys identified..................................................................................................5
Figure 3: Sensors identified..........................................................................................................6
Figure 4: Data/measurement screen examples..........................................................................7
Figure 5: NiMH Battery Pack......................................................................................................9
ii Table of Contents
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Up and Running
1. Ensure the wet bulb’s wick is clean. Then, fill the reservoir with distilled water.
2. Place the WB-300 in the work area in a safe location approximately 3.5 feet off
the ground.
3. Turn the instrument On by pressing I/O Enter key.
• If the battery voltage displayed during the power-on sequence is less than or equal to
6.4 volts, replace or recharge the batteries.
4. Using the Arrow keys, select the desired measurement/parameter screen.
5. Allow 10 minutes for the sensors to stabilize to the environment before taking
readings.
Check wick and fill natural wet bulb
The WB-300 uses a cotton wick immersed into a reservoir containing distilled water. Ordinary
tap water should not be used, as the contaminants that are left behind after evaporation will
shorten the life of the wick and cause high readings. If the wick is discolored it should be
replaced. To replace the wick, slide the old wick off the top of the sensor. Place a new wick over
the sensor, making sure that the bottom of the wick is down in the reservoir.
Figure 1: Wet bulb and maintenance
Filling wet bulb reservoir
1. Remove reservoir cover and fill with distilled or de-ionized water.
2. Replace reservoir cover.
Wick
Reservoir cover
Reservoir
Up & Running
1 Up and Running
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Keypad Operation
The unit operates using a membrane keypad with 4 keys. The key responds
when the key is released while all other keys respond when the key is pressed.
I/O Enter key
Keys
Explanation
I/O Enter
The
key is used to turn on and off the instrument and to enter setup
changes.
Turning on:
Press and release the I/O enter key to power on. The
Instrument name (WIBGET), revision number, and battery information
appears during start-up.
Turning off:
Hold the I/O key down while a count-down 3-2-1 occurs in the
lower left hand corner of the display.
Enter setup changes:
While in Setup screen, press to enter (or select)
setup changes.
Setup
The key allows changing the setup parameters. Two parameters are
available: Celsius or Fahrenheit and language selection.
Setup:
Press setup to access the parameters. Use the arrow keys to
switch between the two parameters. Press the enter key to change the
parameters. Press setup again to exit.
Up Arrow
The key changes which items appear on the display. Scrolls up.
Down Arrow
The key changes which items appear on the display. Scrolls down.
Figure 2: Keypad keys identified
Down Arrow
Up Arrow
Setup key
Keypad
2 Keypad Operation
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Sensors
Natural Wet Bulb Thermometer
The natural wet bulb thermometer gives an indication of the effects of humidity on an individual.
Relative humidity and air flow are taken into account by measuring the amount of evaporative
cooling taking place at a thermometer covered with a moistened wick. The WB-300 uses a
cotton wick immersed into a reservoir containing distilled water. Ordinary tap water should not
be used, as the contaminants that are left behind after evaporation will shorten the life of the wick
and cause high readings. If the wick is discolored it should be replaced. To replace the wick,
slide the old wick off the top of the sensor. Place a new wick over the sensor, making sure that
the bottom of the wick is down in the reservoir.
Globe Thermometer
The globe thermometer gives an indication of the radiant heat exposure on an individual due
to either direct light or hot objects in the environment. This is accomplished by placing a
temperature sensor inside a blackened copper sphere and measuring the temperature rise. The
WBGT index is based on the response of a 6 inch diameter globe. The WB-300 uses a 2 inch
diameter globe for a faster response time. The temperature of the 2 inch globe is correlated
to match that of a 6 inch globe. As an option, a sensor array with a 6 inch diameter globe is
available.
As an option, a sensor array with a 6 inch diameter globe is available.
Dry Bulb Thermometer
The dry bulb thermometer measures the ambient air temperature. This measurement is used in
the outdoor WBGT calculation when a high solar radiant heat load may be present. The series of
white plates surrounding the sensor shield it from radiant heat.
A. Globe thermometer
B. Natural wet bulb thermometer
C. Dry bulb thermometer
A
B
C
Figure 3: Sensors identified
Sensors
3 Sensors
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Measurements
The WB-300 portable heat stress monitor computes the Wet Bulb Globe Temperature (WBGT).
The WBGT is an accepted measurement for determining the heat stress level imposed on an
individual in a given environment.
The WB-300 measures three parameters:
•
Ambient or dry bulb temperature (DB)
•
Natural wet bulb temperature (WB)
•
Globe temperature (G)
Wet Bulb Globe Temperature
The WBGT is a weighted average of the three temperature sensors using the following
formulas:
WBGT (indoor) = 0.7 WB + 0.3G (denoted as "WBGTi" on the display)
WBGT (outdoor) = 0.7WB + 0.2G + 0.1DB (denoted as "WBGTo" on the display)
;
NOTE:
The resulting WBGTi/WBGTo can be compared to indices of
work-rest regimens (or stay times) based upon the work loads.
Please
see Appendix B for published heat exposure tables.
Displayed Data
When powered on, the previously viewed measurement screen will be displayed. To view data
screens, press the or keys.
Data Screens
The following four screens are viewable by pressing the or keys on the WB-300.
Wet/Dry Measurement screen
Globe Measurement screen
WBGTi/WBGTo Measurement screen
Battery screen
Figure 4: Data/measurement screen examples
Measurements
4 Measurements
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Setup
While powered on, press the setup key to change the temperature units (
o
F/
o
C) or the
language settings (English, Spanish, French, Italian, or German), if desired.
Placing the WB-300 on-site for monitoring/testing
The WB-300 should be placed at a height of 3.5 feet (1.1m) for standing individuals or 2
feet (.6m) for seated individuals. Tripod mounting is recommended to get the unit away
from anything that might block radiant heat or airflow. A 1/4"x20 threaded bushing on the
bottom of the instrument allows mounting to a standard photographic tripod. Do not stand
close to the unit during sampling.
Make sure that the wet bulb reservoir is filled with distilled water and that the cotton wick
is clean and fully wetted. After adding water or placing the unit in a new environment,
allow ten minutes for the globe and wet bulb readings to stabilize.
A series of dashes appear in the display if one of the following occur:
• The temperature is outside of its allowable range
• A temperature sensor has failed
Operational Check
A verification module, 3M ID: 70071581246, may be used to check the operation of the
WB-300. Remove the top sensor bar and plug the verification module into the top of the
unit. With the WB-300 set to read in degrees Celsius, verify that the displayed readings
match those printed on the module within +/-0.5
o
C.
If the readings are not within the +/-0.5
o
C tolerance, then have the unit serviced and
calibrated.
Setup
5 Setup
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Figure 5: NiMH Battery Pack
Power Options
There are 3 options for powering the WB-300: a 9-volt alkaline battery, a NiMH (Nickel Metal
Hydride) rechargeable 6-cell battery pack, and an AC adapter. A door on the back of the instru-
ment allows the user access to the 9-volt battery. The rechargeable battery pack is located inside
of the unit. If the rechargeable battery pack ever needs to be replaced, it can be accessed by
removing the screws from the bottom panel of the unit.
The 2-position switch located in the battery compartment must be set by the user if the power
supply method is changed. The up position is for the 9-volt battery. The down position allows
for either the AC adapter or the rechargeable batteries. The AC adapter will trickle charge the
rechargeable batteries if they are in place or it will simply allow for line power operation of the unit.
9-V Alkaline Battery Replacement
The 9-volt battery should be replaced or the NiMH battery pack should be recharged when the
voltage drops below 6.4 volts. The battery voltage is displayed when the instrument is turned
on. While turned on, the battery voltage can be displayed at any time by pressing the up or
down arrow keys to move through the display until the battery voltage screen appears. If, while
operating, the battery voltage drops below 6.4 volts, the display will automatically switch to
the display showing the battery voltage along with a low battery message. After a low battery
occurs, the unit will continue to operate for approximately 8 hours. When the battery voltage
falls to 6.2 volts or below, the unit will automatically turn off.
NiMH Battery Pack
The NiMH rechargeable battery pack is charged in the instrument using 120VAC to 9VDC
adapter. A discharged battery pack requires a charge of 16 hours. Leaving the AC adapter
plugged in for extended lengths of time or when operating the instrument will not harm the
rechargeable batteries.
NiMH Battery Pack
To install, slide into case and plug in
connector as shown.
Power Options
6 Power Options
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Appendix A: Specifications
Measurements
• Globe, dry bulb, wet bulb, WBGTi, (WBGT indoor) and WBGTo (WBGT outdoor).
• Temperatures given in Celsius or Fahrenheit.
Languages
English, French, Spanish, Italian, German.
Housing
Designed water resistant to a light rain or mist. If rain is frequent, best practice would be to
remote the sensor bar and keep the instrument sheltered. (Note: when top sensor bar is
removed, an optional cable can be attached to measure remotely.)
Size
Height 9.2in (23.5cm); Width 7.2in (18.3mm); Depth 3.0in (7.5mm)
Dimensions include mounted sensor assembly.
Weight
2.6 lbs. (1.2 kg) with mounted sensor assembly.
Sensor Types
Temperature: 1000 ohm platinum RTD
Accuracy
Temperature: +/-0.5
o
C between 0
o
C to 100
o
C (+/- 0.9
o
F between 32
o
F to 212
o
F)
Operating Temperature Range
Sensor Assembly: -5
o
C to 100
o
C (23
o
F to 212
o
F)
Electronics: -5
o
C to 60
o
C (23
o
F to 140
o
F)
Power Options
9V alkaline, 7.2V NiMH rechargeable pack (charged in the unit), or AC adapter wall power cube (AC
adapter will power the unit or recharge the NiMH battery pack).
Battery Life
9V alkaline: 140 hours
Rechargeable Nickel Metal Hydride: 300 hours
Charge Time (NiMH Battery Pack)
16 hours (charge in the unit)
Safety Approvals and Special Conditions
CE mark
Compliance with Essential Health and Safety Requirements has been assured by compliance with:
EN 50014 : 1997 and EN 50020 : 2002
The year of manufacture is determined by the third character in the instrument’s serial number. “A”
was manufactured in 2001, “B” in 2002, “C” in 2003, “D” in 2004 and so forth.
Specifications
7 Appendix A: Specifications
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Appendix B: Heat Exposures Tables
ACGIH
Screening Criteria for Heat Stress Exposure. WBGT values in
o
C.
• NOTE: according to the ACGIH’s guidelines, the temperature values represent a work and
rest process which is explained in the standards. Please refer to the ACGIH TLV’s and
BEIs for specific details.
Work and recovery
(TLV )
Light
Moderate
Heavy
Very Heavy
75% to 100%
31.0
28.0
26.0*
23.5*
50% to 75%
31.0
29.0
27.5
25.5*
25% to 50%
32.0
30.0
29.0
28.0
0% to 25%
32.5
31.5
30.5
30.0
Work and recovery
(Action Limit)
Light
Moderate
Heavy
Very Heavy
75% to 100%
28.0
25.0
22.5*
20.0*
50% to 75%
28.5
26.0
24.0
22.5*
25% to 50%
29.5
27.0
25.5
24.5
0% to 25%
30.0
29.0
28.0
27.0
*Values not specified by ACGIH have been estimated for continuity.
Cited from "American Conference of Governmental Industrial Hygienists - Threshold Limit
Values and Biological Exposure Indices for 2008"; Reprinted with permission from ACGIH
Appendix B
8 Appendix B: Heat Exposures Tables
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PHEL Curves (Total Exposure Time in Hours: Minutes)
WBGT (
o
F)
I
II
III
IV
V
VI
80.0
>8:00
>8:00
>8:00
8:00
6:35
4:30
81.0
>8:00
>8:00
>8:00
8:00
6:35
4:30
82.0
>8:00
>8:00
8:00
7:05
5:25
3:40
83.0
>8:00
8:00
7:45
6:25
4:55
3:20
84.0
>8:00
8:00
7:05
5:55
4:30
3:05
85.0
8:00
7:45
6:30
5:20
4:05
2:50
86.0
8:00
7:05
5:55
4:55
3:45
2:35
87.0
7:25
6:30
5:25
4:30
3:25
2:20
88.0
6:45
5:55
4:55
4:05
3:10
2:10
89.0
6:10
5:25
4:30
3:45
2:50
2:00
90.0
5:40
5:00
4:10
3:25
2:40
1:50
91.0
5:15
4:35
3:50
3:10
2:25
1:40
92.0
4:50
4:10
3:30
2:55
2:15
1:30
93.0
4:25
3:50
3:15
2:40
2:00
1:25
94.0
4:05
3:35
3:00
2:25
1:50
1:15
95.0
3:45
3:15
2:45
2:15
1:45
1:10
96.0
3:25
3:00
2:30
2:05
1:35
1:05
97.0
3:10
2:45
2:20
1:55
1:25
1:00
98.0
2:55
2:35
2:10
1:45
1:20
0:55
99.0
2:40
2:20
2:00
1:40
1:15
0:50
100.0
2:30
2:10
1:50
1:30
1:10
0:45
101.0
2:20
2:00
1:40
1:25
1:05
0:45
102.0
2:10
1:50
1:35
1:15
1:00
0:40
103.0
2:00
1:45
1:25
1:10
0:55
0:35
104.0
1:50
1:35
1:20
1:05
0:50
0:35
105.0
1:40
1:30
1:15
1:00
0:45
0:30
106.0
1:35
1:25
1:10
0:55
0:45
0:30
107.0
1:30
1:15
1:05
0:50
0:40
0:25
108.0
1:20
1:10
1:00
0:50
0:35
0:25
109.0
1:15
1:05
0:55
0:45
0:35
0:25
9 PHEL Curves
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Product Information
•
WIBGET WB-300 Heat Stress Monitor kit, includes 9V alkaline battery, replacement wicks,
water bottle, verification module, storage case, and user manual. (3M ID: 70-07160781-9)
Accessories
Product No.
Description
3M ID
056-795
3M
TM
Sensor array with 2 inch globe (one included)
70-0715-8658-3
056-780
3M
TM
Sensor array with 6 inch globe (one included)
70-0715-8656-7
015-910
3M
TM
120VAC to 9VDC transformer/power adapter
70-0715-8174-1
015-680
3M
TM
220VAC to 9VDC transformer/power adapter
70-0715-8507-2
059-045
3M
TM
Tripod
70-0715-8374-7
056-679
3M
TM
Replacement wicks
70-0715-8373-9
053-923
3M
TM
Verification module
70-0715-8124-6
056-068
3M
TM
2 oz water bottle
70-0715-8371-3
W
arranty
3M™ WIBGET™ WB-300 LIMITED WARRANTY.
3M warrants the WIBGET WB-300 will be free from defective materials and workmanship
for one year
from date of purchase
(
indicated on the sales receipt), provided it is maintained and used in accordance
with 3M™ instructions and/or recommendations. If any component becomes defective during the warranty
period, it will be replaced or repaired free of charge. This warranty does not apply to units that have been
altered or had repair attempted, or that have been subjected to abuse, accidental or otherwise. The above
warranty is in lieu of all other express warranties, obligations or liabilities. THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE ARE LIMITED TO one year FROM THE
PURCHASE DATE. 3M™ shall not be liable for any other warranty, express or implied, arising out of or
related to the appropriate use of environmental temperature measurement data for heat stress related issues.
Manufacturer or its agent’s liability shall be limited to replacement or repair as set forth above. Buyer’s sole
and exclusive remedies are return of the goods and repayment of the price, or repair and replacement of
defective goods or parts.
10 Product Information
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Please recycle. Printed in U.S.A.
3M and WIBGET are trademarks of 3M
Used under license in Canada
© 2011 3M Company
All rights reserved.
34-8706-7556-7
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