TSI Instruments QUESTemp 32 - Placement for Monitoring;Testing; Sensors; Natural Wet Bulb Thermometer; Globe Thermometer

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