1. Make sure the wet bulb’s wick is clean. Fill the reservoir with distilled
water. (DO NOT use ordinary tap water).
2. Place the QUESTemp° in the work area in a safe location approximately
3.5 feet off the ground.
3. Turn the unit ON. 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. Use the arrow keys to set the display to the desired items.
5. Allow 10 minutes for the sensors to stabilize to the environment before
taking readings.
Wick
Reservoir cover
Reservoir
Filling wet bulb reservoir
1. Remove reservoir cover and fill with
distilled or de-ionized water.
2. Replace reservoir cover.
Up and Running
Check Wick and Fill Natural Wet Bulb
Up and Running
Check Wick and Fill Natural Wet Bulb
The QUESTemp 32 uses a cotton wick immersed into a reservoir containing distilled
water. DO NOT use ordinary tap water, 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 1-1: Filling wet bulb reservoir
Page 6
2 Measurements
WBGT (indoor) = 0.7WB + 0.3G (denoted as “WBGTi” on the display)
WBGT (outdoor) = 0.7WB + 0.2G + 0.1DB (denoted as “WBGTo” on the
display)
Measurements
QUESTemp32
Measurements
QUESTemp32
The QUESTemp32 portable area 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 QUESTemp32 measures three parameters: ambient or dry bulb temperature
(DB), natural wet bulb temperature (WB), and globe temperature (G).
In addition to the WBGT, the QUESTemp32 measures relative humidity (RH) and
computes the Heat Index (HI) or Humidex. The QUESTemp32, using inputs on the
side of the instrument, has the ability to connect to two additional sensor arrays for
monitoring up to three locations simultaneously.
Wet Bulb Globe Temperature
The WBGT is a weighted average of the three temperature sensors using the
following formulas:
NOTE: The resulting WBGT can be compared to indices of work-rest regimens
(stay times) based upon the work loads. (See Appendix A for published
heat exposure tables.)
Page 7
3 Measurements
Heat Index / Humidex
Heat Index / Humidex
The Heat Index is determined using the dry bulb temperature and relative humidity.
Based upon charts available from the U.S. National Weather Service, Heat Index
represents how an average person feels relative to climate conditions. For a
constant temperature, if the humidity rises, so does the heat index.
The Heat Index is defined over a temperature range of 70F - 120F (21C - 49C)
and a relative humidity range of 30% - 99%. Outside of this range, the instrument
will show dashes in the display for the Heat Index.
The Humidex is used primarily in Canada and is very similar to the Heat Index. The
values are slightly different. The Humidex is defined over a temperature range of
70F - 109F (21C - 43C) and a relative humidity range of 20% - 99%. Outside of
this range, the instrument will show dashes in the display for the Humidex.
Page 8
4 Keypad Operation
Keys
Explanation
I/O Enter key
The unit turns on with a single key press. The unit turns off
by holding the key down while a countdown of 3-2-1 occurs
in the lower right corner of the display. This key is also
used to enter setup changes.
While viewing live readings, pressing and releasing the key
will cause the display to view the next available sensor bar
(indicated in the upper right corner of the display).
Up Arrow key
Changes which items appear in the display. Scrolls up.
Down Arrow key
Changes which items appear in the display. Scrolls down.
Setup key
Allows changing the setup parameters. Three parameters
are available: Celsius or Fahrenheit, the language, and
Heat Index or Humidex. Press setup to access the
parameters. Use the arrow keys to switch between the two
parameters. Use the enter key to change the parameters.
Press setup again to exit.
Keypad
Operation
Heat Index / Humidex
Keypad Operation
The unit operates using a membrane keypad with four keys. The I/O ENTER key
responds when the key is released while all other keys respond when the key is
pressed.
Displayed Items
The number in the upper right corner indicates which sensor bar’s data is displayed.
1 indicates the sensor bar placed on (or attached to) the top of the instrument. Sensors
2 and 3 are labeled on the side of the unit. W indicates the weighted average which only
appears if a WBGT is displayed and all three sensor bars are attached.
Page 9
5 Displayed Items
Screen 1: WET (Wet bulb)
DRY (Dry bulb)
WET 80.5º F 1
DRY 92.2º F
Screen 2: GLOBE
GLOBE 92.4.º F 1
Screen 3: WBGTi (Indoors)
WBGTo (Outdoors)
WBGTi 84.1 º F 1
WBGTo 107.5 º F
Screen 4: RH (Relative Humidity)
H.I. or HU
(Heat Index or Humidex)
RH 66.2 % 1
H.I. 84.3º F
Heat Index / Humidex
The following measurements can be accessed on the display:
Page 10
6 Placement for Monitoring/Testing
Placement
Natural Wet Bulb Thermometer
Placement for Monitoring/Testing
The QUESTemp° 32 should be placed at a height of 3.5 feet (1.1 m) for standing
individuals or 2 feet (.6 m) for seated individuals. Tripod mounting is recommended to
get the unit away from anything that might block radiant heat or air flow. A ¼ "x 20
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 Heat Index or Humidex is outside of its allowable range
The temperature is outside of its allowable range
A temperature sensor has failed
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 QUESTemp° 32 uses a cotton wick immersed into a reservoir containing
distilled water. DO NOT use ordinary tap water, 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 QUESTemp° 32 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.
Page 11
7 Sensors
Dry Bulb Thermometer
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.
Relative Humidity Sensor
A relative humidity sensor is located in a compartment inside of the sensor bar housing.
Slots in the housing allow air to circulate around the sensor.
Page 12
8 Remote, Sensors 2 and 3
WBGTw = (WBGT
head
+ (2 x WBGT
abdomen
) + WBGT
ankles
)/4
Remote,
Sensors 2 & 3
Tri-Sensor Weighted Average
Remote, Sensors 2 and 3
The top sensor bar (sensor 1) may be removed from the instrument and used through a
remote cable. Shelter the instrument and remote the sensor bar if the measured
environment is expecting heavy rain or if temperatures are above 60C.
The sensor 2 and sensor 3 jacks on the side of the instrument allow simultaneous
monitoring of up to three sensor arrays using connecting cables.
Cable lengths of up to two hundred feet (61 meters) may be used without a decrease in
accuracy provided the environment does not contain strong electromagnetic fields.
The data from these arrays may be viewed separately or combined into a weighted
average WBGT reading per ISO 7243. Change the displayed sensor bar by pressing
and releasing the enter key. The upper right corner of the display shows the current
sensor bar. 1 refers to the top sensor bar, 2 and 3 are labeled on the side of the unit, W
indicates the weighted average which only appears if a WBGT is displayed and all three
of the sensor bars are attached.
Tri-Sensor Weighted Average
Per the recommendations outlined in ISO 7243:2017, when the temperature in the
space surrounding a worker is not uniform, it is necessary to determine the WBGT
index at three heights corresponding to the worker's ankles, abdomen and head and
perform a weighted average on those values. It is computed using the formula:
The QUESTemp° 32 always assigns the top sensor bar the double weighting. This
calculation is shown if a WBGT display has been selected and if 3 sensor sets are
connected.
Operational Check
A verification module, model 054-544, may be used to check the operation of the
QUESTemp. Remove the top sensor bar and plug the verification module into the top of
the unit. With the QUESTemp set to read in degrees Celsius, verify that the displayed
readings match those printed on the module within ±0.5C.
If the readings are not within the ±0.5C tolerance, then have the unit serviced and
calibrated.
Page 13
9 Power Options
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-volt battery
Power Options
9-V Alkaline Battery Replacement
Power Options
There are 3 options for powering the QUESTemp 32: 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 unit 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.
9-V Alkaline Battery Replacement
WARNING: Replace batteries only in a non-hazardous environment.
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.
Replace only with an approved 9-volt alkaline battery.
Approved 9-Volt Batteries
Eveready: Energizer 522, EN22, 6LR61
Duracell: MN1604
Panasonic: 6LR61, 6AM6X
Rayovac: A1604
UltraLife: U9V
Page 14
10 Power Options
Battery Pack
NIMH Battery
To install: Slide into case and
plug in connector as shown.
NiMH Battery Pack
NiMH Battery Pack
WARNING: Recharge batteries only in a non-hazardous environment.
The NiMH rechargeable battery pack is charged in the instrument using TSI’s AC
adapter #015-910. A discharged battery pack requires an “overnight” 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.
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.
Batteries
Only the following battery types may be used:
Non-rechargeable battery
Rechargeable battery
Integral NiMH battery pack type DC2121
The rechargeable battery may only be recharged with class 2 charger, rated 9 VDC,
1 A max.
Page 17
Appendix B: Heat Exposures Tables
13
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
Appendix B
Appendix B: Heat Exposures Tables
ACGIH
Screening Criteria for Heat Stress Exposure. WBGT values in C.
NOTE: According to the ACGIH’s guidelines, the temperature values represent
a work and rest process which is explained in the standards. Refer to
the ACGIH TLV’s and BEIs for specific details.
*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
Page 18
Appendix B: Heat Exposures Tables
14
WBGT(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
United States Navy
Physiological Heat Exposure Limits (PHEL) Time Table
(Without the presence of fuel combustion gases/fuel vapors) is displayed on the
following page.
The recommended working hours are shown based on a maximum of eight hours.
Naval personnel will follow a category, I - VI, based upon their function.
PHEL Curves (Total Exposure Time in Hours: Minutes)
Page 19
Appendix B: Heat Exposures Tables
15
WBGT(F)
I
II
III
IV V VI
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
110.0
1:10
1:00
0:50
0:40
0:30
0:20
111.0
1:05
1:00
0:50
0:40
0:30
0:20
112.0
1:00
0:55
0:45
0:35
0:25
0:20
113.0
0:55
0:50
0:40
0:35
0:25
0:15
114.0
0:55
0:45
0:40
0:30
0:25
0:15
115.0
0:50
0:45
0:35
0:30
0:20
0:15
116.0
0:45
0:40
0:35
0:25
0:20
0:15
117.0
0:45
0:40
0:30
0:25
0:20
0:10
118.0
0:40
0:35
0:30
0:25
0:15
0:10
119.0
0:35
0:35
0:25
0:20
0:15
0:10
120.0
0:35
0:30
0:25
0:20
0:15
0:10
121.0
0:35
0:30
0:25
0:20
0:15
0:10
122.0
0:30
0:25
0:20
0:15
0:15
0:10
123.0
0:30
0:25
0:20
0:15
0:10
0:10
124.0
0:25
0:25
0:20
0:15
0:10
0:05
Page 20
Appendix B: Heat Exposures Tables
16
WBGT°C
Light
Moderate
Heavy
28
4:01
4:01
3:00
29
4:01
4:00
2:00
30
4:01
3:00
1:30
31
4:01
2:00
1:15
32
4:00
1:30
1:00
33
3:30
1:15
0:45
34
3:00
1:00
0:40
35
2:30
0:53
0:35
36
2:00
0:45
0:30
37
1:45
0:40
0:25
38
1:30
0:35
0:20
39
1:15
0:33
0:18
40
1:00
0:30
0:15
41
0:53
0:28 0 42
0:45
0:25 0 43
0:38
0:23 0 44
0:30
0:20 0 45
0:28
0:18
0
46
0:25
0:15 0 47
0:23 0 0
48
0:20 0 0
49
0:18 0 0
50
0:15 0 0
Electrical power research institute (EPRI)
The recommended working hours are shown based on a maximum of four hours. A
time of 4:01 indicates greater than 4 hours.
Page 21
Appendix B: Accessories
17
Appendix B:
Accessories
Appendix B: Accessories
Sensor array with 2-inch globe .......................... 056-795
Sensor array with 6-inch globe .......................... 056-780
1060 Corporate Center Drive
Oconomowoc, WI 53006-4828
Europe, Middle East, and
Africa
TSI Instruments Ltd.
Stirling Road
Cressex Business Park
High Wycombe, Bucks
HP12 3ST
United Kingdom
Telephone: 1-800-680-1220 (USA);
+1 651-490-2860 (Outside
USA)
E-mail: technical.services@tsi.com
Telephone: +44 (0) 149 4
459200
E-mail: tsiuk@tsi.com
Contact/Service
Information
Contact/Service information
This section gives directions for contacting TSI Incorporated for technical
information and directions for returning the QUESTemp° 32 for service.
Technical Support Contacts
If you have any difficulty setting or operating the instrument, or if you have
technical or application questions about this system, contact TSI’s Technical
Support.
Service Contact Information
If your instrument does not operate properly, or if you are returning the
instrument for service, visit our website at http://rma.tsi.com for a Return
Material Authorization, or contact Customer Service.
Page 23
Contact/Service information
19
Returning for Service
Visit our website at http://rma.tsi.com and complete the on-line “Return
Merchandise Authorization” form or call TSI at 1-800-680-1220 (USA) or
(651) 490-2860, or 001 651 490 2860 (International) for specific return
instructions.
Customer Service will need the following information:
The instrument model number
The instrument serial number
A purchase order number (unless under warranty)
A billing address
A shipping address
Use the original packing material to return the instrument to TSI. If you no
longer have the original packing material, seal off any ports to prevent debris
from entering the instrument and ensure that the display and the connectors on
the instrument front and back panels are protected. This instrument is very
fragile and must be packed in a manner appropriate for a precision instrument.
Calibration
The QUESTemp⁰ 32 Heat Stress Sensor should be examined regularly by the
factory. An annual calibration is recommended. (See Service Department
above.)
Page 24
Warranty
20
Warranty
(For country-specific terms and conditions outside of the USA, please visit www.tsi.com.)
Seller warrants the goods, excluding software, sold hereunder, under normal use and service as described
in the operator's manual, to be free from defects in workmanship and material for 12 months, or if less, the
length of time specified in the operator's manual, from the date of shipment to the customer. This warranty
period is inclusive of any statutory warranty. This limited warranty is subject to the following exclusions and
exceptions:
a. Hot-wire or hot-film sensors used with research anemometers, and certain other components when
indicated in specifications, are warranted for 90 days from the date of shipment;
b. Pumps are warranted for hours of operation as set forth in product or operator’s manuals;
c. Parts repaired or replaced as a result of repair services are warranted to be free from defects in
workmanship and material, under normal use, for 90 days from the date of shipment;
d. Seller does not provide any warranty on finished goods manufactured by others or on any fuses, batteries
or other consumable materials. Only the original manufacturer's warranty applies;
e. This warranty does not cover calibration requirements, and seller warrants only that the instrument or
product is properly calibrated at the time of its manufacture. Instruments returned for calibration are not
covered by this warranty;
f. This warranty is VOID if the instrument is opened by anyone other than a factory authorized service center
with the one exception where requirements set forth in the manual allow an operator to replace
consumables or perform recommended cleaning;
g. This warranty is VOID if the product has been misused, neglected, subjected to accidental or intentional
damage, or is not properly installed, maintained, or cleaned according to the requirements of the manual.
Unless specifically authorized in a separate writing by Seller, Seller makes no warranty with respect to, and
shall have no liability in connection with, goods which are incorporated into other products or equipment, or
which are modified by any person other than Seller.
The foregoing is IN LIEU OF all other warranties and is subject to the LIMITATIONS stated herein. NO
OTHER EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR PARTICULAR PURPOSE OR
MERCHANTABILITY IS MADE. WITH RESPECT TO SELLER’S BREACH OF THE IMPLIED WARRANTY
AGAINST INFRINGEMENT, SAID WARRANTY IS LIMITED TO CLAIMS OF DIRECT INFRINGEMENT AND
EXCLUDES CLAIMS OF CONTRIBUTORY OR INDUCED INFRINGEMENTS. BUYER’S EXCLUSIVE
REMEDY SHALL BE THE RETURN OF THE PURCHASE PRICE DISCOUNTED FOR REASONABLE WEAR
AND TEAR OR AT SELLER’S OPTION REPLACEMENT OF THE GOODS WITH NON-INFRINGING
GOODS.
TO THE EXTENT PERMITTED BY LAW, THE EXCLUSIVE REMEDY OF THE USER OR BUYER, AND
THE LIMIT OF SELLER'S LIABILITY FOR ANY AND ALL LOSSES, INJURIES, OR DAMAGES CONCERNING
THE GOODS (INCLUDING CLAIMS BASED ON CONTRACT, NEGLIGENCE, TORT, STRICT LIABILITY OR
OTHERWISE) SHALL BE THE RETURN OF GOODS TO SELLER AND THE REFUND OF THE PURCHASE
PRICE, OR, AT THE OPTION OF SELLER, THE REPAIR OR REPLACEMENT OF THE GOODS. IN THE
CASE OF SOFTWARE, SELLER WILL REPAIR OR REPLACE DEFECTIVE SOFTWARE OR IF UNABLE TO
DO SO, WILL REFUND THE PURCHASE PRICE OF THE SOFTWARE. IN NO EVENT SHALL SELLER BE
LIABLE FOR LOST PROFITS, BUSINESS INTERRUPTION, OR ANY SPECIAL, INDIRECT,
CONSEQUENTIAL OR INCIDENTAL DAMAGES. SELLER SHALL NOT BE RESPONSIBLE FOR
INSTALLATION, DISMANTLING OR REINSTALLATION COSTS OR CHARGES. No Action, regardless of
form, may be brought against Seller more than 12 months after a cause of action has accrued. The goods
returned under warranty to Seller's factory shall be at Buyer's risk of loss, and will be returned, if at all, at
Seller's risk of loss.
Buyer and all users are deemed to have accepted this LIMITATION OF WARRANTY AND LIABILITY, which
contains the complete and exclusive limited warranty of Seller. This LIMITATION OF WARRANTY AND
LIABILITY may not be amended, modified or its terms waived, except by writing signed by an Officer of Seller.
Service Policy
Knowing that inoperative or defective instruments are as detrimental to TSI as they are to our customers,
our service policy is designed to give prompt attention to any problems. If any malfunction is discovered, please
contact your nearest sales office or representative, or call TSI’s Customer Service department at 1-800-8742811 (USA) or +001 (651) 490-2811 (International).
Page 25
USA Tel: +1 800 874 2811
UK Tel: +44 149 4 459200
France Tel: +33 1 41 19 21 99
Germany Tel: +49 241 523030
India Tel: +91 80 67877200
China Tel: +86 10 8219 7688
Singapore Tel: +65 6595 6388
TSI Incorporated – Visit our website www.tsi.com for more information.