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3M Personal Safety Division
3M™ QUESTemp°™ Heat Stress Monitors
Robust Construction
©3M 2013. All Rights Reserved
From the
Market Leader
QUESTempo 32 User Manual
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TABLE OF CONTENTS |
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TABLE OF CONTENTS |
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Up and Running ................................................................................................... |
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Check Wick and Fill Natural Wet Bulb ............................................................... |
1 |
Measurements...................................................................................................... |
2 |
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QUESTemp 32................................................................................................ |
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Wet Bulb Globe Temperature .......................................................................... |
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Heat Index / Humidex ...................................................................................... |
2 |
Keypad Operation ................................................................................................ |
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I/O Enter .......................................................................................................... |
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Up Arrow.......................................................................................................... |
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Down Arrow ..................................................................................................... |
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Setup ............................................................................................................... |
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Displayed Items.................................................................................................... |
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Placement for monitoring/testing .......................................................................... |
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Sensors ................................................................................................................ |
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Natural Wet Bulb Thermometer ....................................................................... |
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Globe Thermometer......................................................................................... |
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Dry Bulb Thermometer .................................................................................... |
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Relative Humidity Sensor ................................................................................ |
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Remote, Sensors 2 and 3 ...................................................................................... |
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Tri-Sensor Weighted Average ......................................................................... |
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Operational Check................................................................................................ |
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Power Options...................................................................................................... |
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9-V Alkaline Battery Replacement ................................................................... |
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Approved 9-Volt Batteries................................................................................ |
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NiMH Battery Pack .......................................................................................... |
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Specifications ....................................................................................................... |
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Product Markings and Special Conditions ............................................................ |
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Special conditions for safe use: ............................................................................ |
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APPENDIX A: Heat Exposures Tables............................................................... |
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TABLE OF CONTENTS |
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ACGIH ........................................................................................................... |
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United States Navy ........................................................................................ |
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Electrical power research institute (EPRI) ..................................................... |
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APPENDIX B: Accessories .................................................................................. |
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Customer Service................................................................................................ |
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Contacting 3M Detection ............................................................................... |
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Calibration ..................................................................................................... |
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Warranty ........................................................................................................ |
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1 Up and Running
Up & Running
Up and Running
1.Make sure the wet bulb’s wick is clean. Fill the reservoir with distilled 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.
Check Wick and Fill Natural Wet Bulb
The QUESTemp 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.
Wick
Reservoir cover
Reservoir
Filling wet bulb reservoir
1.Remove reservoir cover and fill with distilled or de-ionized water.
2.Replace reservoir cover.
Figure 1-1: Filling wet bulb reservoir
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Measurements |
Measurements |
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Measurements
QUESTemp 32
The QUESTemp 32 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 QUESTemp 32 measures three parameters: ambient or dry bulb temperature (DB), natural wet bulb temperature (WB), and globe temperature (G).
In addition to the WBGT, the QUESTemp 32 measures relative humidity (RH) and computes the Heat Index (HI) or Humidex. The QUESTemp 32, 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:
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)
NOTE: The resulting WBGT can be compared to indices of work-rest regimens (stay times) based upon the work loads. (Please see Appendix A for published heat exposure tables.)
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 70 F - 120 F (21 C - 49 C) 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 70 F - 109 F (21 C - 43 C) and a relative humidity range of 20% - 99%. Outside of this range, the instrument will show dashes in the display for the Humidex.
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Keypad Operation |
Keypad |
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Operation |
Keypad Operation
The unit operates using a membrane 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.
I/O Enter
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
Changes which items appear in the display. Scrolls up.
Down Arrow
Changes which items appear in the display. Scrolls down.
Setup
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.
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.
The following measurements can be accessed on the display:
Screen 1:
WET (WET BULB)
DRY (DRY BULB)
Screen 2: GLOBE
Screen 3: WBGTi (WBGT INDOORS)
WBGTo (WBGT OUTDOORS)
Screen 4: RH (Relative Humidity)
H.I. (Heat Index) or Humidex
Screen 5 : BAT (BATTERY VOLTAGE)
WET 80.5 F 1 DRY 92.2 F
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