3M 48N User Manual
3M Persomal Safety Division
3M™ QUESTemp°™Heat Stress Monitors
Robust Construction
From the
From the
Market Leader
QUESTemp
©3M 2013 All Rights Res erved
o
48N User Manual
i Contents
Contents
Contents
Introduction .......................................................................................................................................................... 1
QUESTempº 48N Model....................................................................................................................................... 1
Getting Started ..................................................................................................................................................... 2
Up and Running overview ................................................................................................................................... 2
Placing the QUESTempº 48N on the job site ..................................................................................................... 2
Keypad Operation ............................................................................................................................................... 3
Turning on, logging/capture an event, and turning off ........................................................................................ 4
Sensors................................................................................................................................................................. 6
Globe Thermometer ............................................................................................................................................ 6
Waterless Wetbulb & Relative Humidity Sensor ................................................................................................. 6
Dry Bulb Thermometer........................................................................................................................................ 6
Measurements ..................................................................................................................................................... 7
WetBulb Globe Temperature (WBGT) ................................................................................................................ 7
Stay Times/Rest Times (Indicies) ....................................................................................................................... 7
Remote measurements ....................................................................................................................................... 7
Operating QUESTempº 48N ................................................................................................................................ 8
View .................................................................................................................................................................... 8
Setup ................................................................................................................................................................... 8
Print ................................................................................................................................................................... 10
Reset ................................................................................................................................................................. 10
Run ................................................................................................................................................................... 10
Displayed Items ................................................................................................................................................. 11
Stay Time/Index ................................................................................................................................................ 12
Data Logging ...................................................................................................................................................... 13
Electronic sensor check ................................................................................................................................... 14
Performing an electronic sensor check ............................................................................................................. 14
Sensor Alignment .............................................................................................................................................. 15
RH Sensor Alignment ....................................................................................................................................... 15
Printing ............................................................................................................................................................... 17
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Data/Communications....................................................................................................................................... 17
Parallel .............................................................................................................................................................. 18
Power .................................................................................................................................................................. 19
9-Volt Alkaline Battery Replacement ................................................................................................................ 19
Approved 9-Volt Batteries ................................................................................................................................. 19
Appendix A: Specifications ............................................................................................................................. 20
QUESTemp° 48N Block Model ........................................................................................................................ 22
Appendix B: Heat Exposure Tables ................................................................................................................. 23
ACGIH ............................................................................................................................................................... 23
ACGIH Clothing Corrections ............................................................................................................................. 24
United States Navy ........................................................................................................................................... 24
Flag Conditions for U.S. Navy/Marine Corp. Ashore ........................................................................................ 26
Appendix C: Accessories ................................................................................................................................. 27
Appendix D: Software ...................................................................................................................................... 28
DMS quick overview ......................................................................................................................................... 28
Communicating and Downloading in DMS ....................................................................................................... 28
Data Finder and quick reports .......................................................................................................................... 29
Customer service .............................................................................................................................................. 31
Contacting 3M Instrumentation ......................................................................................................................... 31
International customers..................................................................................................................................... 31
Calibration .......................................................................................................................................................... 31
Warranty ............................................................................................................................................................. 31
List of Figures
Figure 1-1: QUESTempº 48N in a thermal environment……………………………………………………………………. 1
Figure 1-2: Keypad keys identified…………………………………………………………………………………………….. 3
Figure 1-3: Start-up screens……………………………………………………………………………………………………4
Figure 1-4: Index start-up screen……………………………………………………………………………………………... 4
Figure 1-5: Log rate start-up screen………………………………………………………………………………………….. 4
Figure 1-6: Main menu of the QT48N………………………………………………………………………………………… 5
Figure 1-7: Measurement screen …………..………………………………………………………………………………… 5
Figure 1-8: Sensors identified………………………………………………………………………………………………… 6
Figure 1-9: Main menu example………………………………………………………………………………………………. 8
Figure 1-10: Viewing measured data…………………………………………………………………………………………. 8
Figure 1-11: Selecting temperature setting and setup………………………………………………………………………….. 9
Contents
iii
Figure 1-12: Selecting temperature setting………………………………………………………………………………………. 9
Figure 1-13: Selecting log rate with event log……………………………………………………………………………….. 9
Figure 1-14: Run mode indicator……………………………………………………………………………………………. 10
Figure 1-15: Wet and Dry screen…………………………………………………………………………………………….. 11
Figure 1-16: Globe and RH screen………………………………………………………………………………………….. 11
Figure 1-17: WBGT screen…………………………………………………………………………………………………… 11
Figure 1-18: Time and Date screen…………………………………………………………………………………………. 11
Figure 1-19: Battery & memory screen……………………………………………………………………………………... 12
Figure 1-20: Navy PHEL stay times…………………………………………………………………………………………..12
Figure 1-21: Index for ACGIH………………………………………………………………………………………………... 12
Figure 1-22: Navy PHELs screen…………………………………………………………………………………………….13
Figure 1-23: Flag Conditions Navy/Marine Corp. Ashore………………………………………………………………… 13
Figure 1-24: Main menu with view selected ……………………………………………………………………………….. 15
Figure 1-25: Alignment screen………………………………………………………………………………………………. 15
Figure 1-26: Sunshield & placement of finger cot prior to RH alignment……………………………………………… 15
Figure 1-27: RH alignment with Low % example………………………………………………………………………… 16
Figure 1-28: RH alignment with High% screen…………………………………………………………………………… 16
Figure 1-29: Sample DMS event data report……………………………………………………………………………… 17
Figure 1-30: Sample printouts……………………………………………………………………………………………….. 18
Figure 1-31: 9-volt battery……………………………………………………………………………………………………. 19
Figure 1-33: Communicating with the QT⁰ 48N and DMS……………………………………………………………….. 28
Figure 1-34: Communicating with the QT⁰ 48N and DMS……………………………………………………………….. 29
Figure 1-35: Data Finder Page……………………………………………………………………………………………… 29
Figure 1-36: Quick Report…………………………………………………………………………………………………… 30
Figure 1-37: Analyze button opens to the panel layout page…………………………………………………………… 30
LIST OF TABLES
Table 1-1: Keypad explained ................................................................................................................................... 3
Table 1-2: Settings indentified ................................................................................................................................. 8
Table 1-3: Example of a Memory table .................................................................................................................. 13
1 Introduction
Introduction
Up and Running overview
Introduction
The QUESTempº 48N offers traditional heat stress monitoring without the aggravation
of maintaining a wet bulb. Through collaboration with Professor Dr. Thomas Bernard,
from the College of Public Health at the University of South Florida, mathematical
models were implemented to create a
combination of dry bulb temperature, globe temperature, relative humidity, and air
flow.
Figure 1-1: QUESTempº 48N in a thermal environment
Waterless Wet Bulb calculation
through a
QUESTempº 48N Model
The QUESTempº 48N model was specifically engineered for the Department of
Defense Ashore and Afloat Operations in which conditions require hand’s free
monitoring, in-the-field user RH/WBGT sensor alignments, and snapshot measurement
logging (called “event logging mode”).
The QT48N measures and calculates the dry bulb, wet bulb, globe, WBGT outdoors,
and relative humidity with two different types of data logging modes – as a time
history session or an event logging mode.
You also have the capability to measure stay times in order to manage work/rest
regimens. Guidance is based on the screening criteria for heat stress as defined in the
ACGIH TLV Handbook, U.S. Navy PHEL charts, and Flag Conditions for U.S.
Navy/Marine Corp. Ashore.
2 Getting Started
1. Place the QUESTempº 48N in the work area in a safe location approximately
3.5 feet off the ground.
2. 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.
3. Be aware that the sensors require 10 minutes to stabilize to a new
environment.
4. In the main menu, View will be selected (an indicator arrow denotes the
selected menu). Press the I/O Enter key and the measurement screen
will appear.
5. Press the Run/Stop key to begin datalogging. Use the Arrow keys to
set the display to the desired items.
Getting started
Up and Running overview
Getting Started
Up and Running overview
Placing the QUESTempº 48N on the job site
The QUESTempº 48N 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"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.
Before data logging, allow ten minutes for the sensors readings to stabilize.
3 Getting Started
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 select a mode (such as Setup or View) or enter setup
changes.
Pressing and releasing the key while viewing temperatures
causes the display to view the next available sensor bar
(indicated in the upper right corner of the display).
Up Arrow key
Changes items appearing in the display. Scrolls up.
Down Arrow
key
Changes items appearing in the display. Scrolls down.
Run/Stop key
From the menu or view modes, pressing this key starts or
stops the run mode. Pressing this key will exit the setup,
print or reset modes.
Escaping or
moving back
one screen
If you are in the setup, print, reset, or sensor alignment
screens, you can press Run/Stop key to escape or move
back one screen.
I/O Enter key
Run/Stop key
Up Arrow key
Down Arrow key
Keypad Operation
Keypad Operation
The unit operates using a keypad with 4 keys. The I/O Enter key responds
when the key is released while all other keys respond when the key is pressed.
Table 1-1: Keypad explained
Figure 1-2: Keypad keys identified
Getting Started
4
A
B
Turning on, logging/capture an event, and turning off
Turning on, logging/capture an event, and turning off
To quickly get you started with the QUESTempº 48N, the following section explains
turning on the instrument, data logging/event logging, and stopping.
1. Press the I/O Enter key to turn on.
The first two start-up screens detail the name, type of instrument, and then
a revision and battery power screen appears. (Ensure the battery level
does not fall below 6.4V or you will want to replace the battery. See
“Power options”, page 19 for more details.)
NOTE: if you have data saved on the instrument, an additional screen stating
“data in memory” will appear prompting you to reset the instrument, if desired.
Figure 1-3: Start-up screens (A – indicates model and type
B- indicates revision and battery power)
2. In the Index Start-Up screen, press I/O Enter key. (
selected from the Setup menu, this will appear on this screen.
NOTE: if an index is
)
Figure 1-4: Index start-up screen
3. A Log Rate Start-Up screen will appear, press I/O Enter key. (This screen
details your log rate time or event logging setup option and the last saved
logged session or event.) (See Setup, page 8 for more information on event
logging.)
Figure 1-5: Log rate start-up screen
Getting Started
5
Indicator arrow
Indicates the selected menu option.
Either press up/down arrows to
select a new menu or press I/O
Enter key to select.
Run indicator
Will appear when you are in “Run
mode”. For an event, it will appear for
about 1-2 seconds as an event is
recorded in the instrument’s history.
Numeric counter
Event records or Data logging
sessions displayed
Turning on, logging/capture an event, and turning off
4. The main menu (navigational screen) will appear after the start-up screens.
Press I/O Enter key. (This will open to the measurement screens.)
Figure 1-6: Main menu of the QT48N
5. Press Run/Stop key to either Data Log or log/record an Event and an asterisk
will appear in far right corner. (NOTE: Data logging or an Event is selected
via the Setup menu.)
Numeric counter
o
Event logging/recording:
increase by one displaying the number of saved events.
o
Data logging mode
sessions instead of Events. (The process is identical to event mode.)
Figure 1-7: Measurement screen (example)
6. To stop data logging, press and hold Run/Stop key. (NOTE: please skip this
step for an Event log. An event log will capture the measurements with the
initial run/stop key press.)
7. To view different measurements, press the Up or Down Arrow key to toggle
through the views.
8. To return to the main menu, press and hold the I/O Enter key (3, 2, 1
countdown will appear) and the main menu will display.
To select an option on the main menu, press the Up or Down Arrow until
an arrow appears directly in front of the appropriate menu selection and
then press I/O enter key.
9. To power off, press and hold the I/O Enter key from the main menu.
As you record events, the numeric counter will
: This will display the number of saved data logged
Sensors
6
A. Globe thermometer
B. Relative humidity sensor
C. Dry bulb thermometer
Sensors
A
B
C
Globe Thermometer
Sensors
Globe Thermometer
The globe thermometer (left position) gives an indication of the radiant heat
exposure on an individual due to either direct sunlight 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 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.
Waterless Wetbulb & Relative Humidity Sensor
The relative humidity sensor (middle position) is used to calculate the Waterless
Wetbulb from a combination of dry bulb temperature, humidity and wind speed
measurements. The waterless wetbulb is used to calculate an estimated WBGT
value.
Dry Bulb Thermometer
The dry bulb thermometer (right position) 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.
Figure 1-8: Sensors identified
Measurements
7
**NOTE: Navy and Marine calculations are all based on the outdoor computation.
WBGT (outdoor) = 0.7WB + 0.2G + 0.1DB (denoted as “WBGT” on the display)
Measurements
WetBulb Globe Temperature (WBGT)
Measurements
The QUESTemp 48N data logging, with an event logging mode, heat stress
monitor directly senses three parameters: dry bulb temperature (DB), globe
temperature (G), and relative humidity (RH).
It computes the Wet Bulb (WB), the Wet Bulb Globe Temperature (WBGT), and the
Stay Times Indices for ACGIH, U.S. Navy PHEL charts, and Flag Conditions for U.S.
Navy/Marine Corp. Ashore.
WetBulb Globe Temperature (WBGT)
The WBGT is a type of temperature index which combines the effects of
temperature, humidity, radiant heat, and air flow and provides a relatively simplistic
tool to analyze thermal comfort. The resulting WBGT values can then be compared
to indices of work-rest regimens (stay times) based upon workloads.
The WBGT calculation is a weighted average of the three temperature sensors using
the following formulas:
Stay Times/Rest Times (Indicies)
Stay Times Indices represent how long a worker should be able to safely work
under heat stress conditions. Select one of four indices for displaying and
printing from the unit: ACGIH Stay Times, NAVY PHEL’s, or Flag Conditions for
U.S. Navy/Marine Corp. Ashore. Refer to Appendix B for more information on
the indices. NOTE: it will appear as “Index” on the measurement screen.
Remote measurements
The top sensor bar may be removed from the instrument and used through a
remote cable. (Please refer to Appendix C for remote cable options.) Shelter
the instrument and remote the sensor bar if the measured environment is
expecting heavy rain or if temperatures are above 60C.
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