TSI Instruments QUESTemp 32 Manual de usuario

iii Table of Contents

Table of Contents

Up and Running............................................ 1

Check Wick and Fill Natural Wet Bulb.............. 1

Measurements............................................... 2

QUESTemp32.................................................. 2

Wet Bulb Globe Temperature ........................... 2

Heat Index / Humidex ........................................ 3

Keypad Operation......................................... 4

Displayed Items ............................................ 4

Placement for Monitoring/Testing .............. 6

Sensors.......................................................... 6

Natural Wet Bulb Thermometer........................ 6

Globe Thermometer........................................... 6

Dry Bulb Thermometer ...................................... 7

Relative Humidity Sensor .................................. 7

Remote, Sensors 2 and 3............................. 8

Tri-Sensor Weighted Average........................... 8

Operational Check........................................ 8

Power Options .............................................. 9

9-V Alkaline Battery Replacement.................... 9

Approved 9-Volt Batteries.................................. 9

NiMH Battery Pack........................................... 10

Appendix A: Specifications ...................... 11

Measurements .................................................11

Languages........................................................11

Housing.............................................................11

Size ...................................................................11

Weight...............................................................11

Sensor Types ...................................................11

Accuracy ...........................................................11

Operating Temperature Range.......................11

Remote Sensor Bars .......................................11

Power Options..................................................12

Battery Life........................................................12

Charge Time (NiMH Battery Pack)................. 12

Safety Approvals.............................................. 12

Product Markings .............................................12

Batteries............................................................12

Appendix B: Heat Exposures Tables........ 13

ACGIH...............................................................13

United States Navy ..........................................14

Electrical power research institute (EPRI)......16

Appendix B: Accessories .......................... 17

Contact/Service information...................... 18

Technical Support Contacts ............................18

Service Contact Information............................18

Returning for Service .......................................19

Calibration.........................................................19

Warranty ...................................................... 20

iv Table of Contents

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1 Up and Running

Check Wick and Fill Natural Wet Bulb

Up and Running

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.

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.

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

Up and Running

2 Measurements

QUESTemp32

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. (See Appendix A for published

heat exposure tables.)

Measurements

3 Measurements

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.

4 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.

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.

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.

Keypad

Operation

5 Displayed Items

Heat Index / Humidex

The following measurements can be accessed on the display:

Screen 1: WET (Wet bulb)

DRY (Dry bulb)

WET 80.5ºF 1

DRY 92.2ºF

Screen 2: GLOBE

GLOBE 92.4.ºF 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. 84.3ºF

6 Placement for Monitoring/Testing

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.

Placement

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