QUESTemp 44

TSI Quest QUESTemp 44

The QUESTemp° 44/46/48N utilizes a waterless wet bulb sensor designed for working environments where daily instrument upkeep is difficult.

A high-quality humidity sensor and proprietary algorithm perform the calculation of the Wet Bulb Globe Temperature (WBGT) values, eliminating the hassle of daily wet bulb maintenance.
  • Utilizes WBGT sensing technology; the standard for heat stress management
  • Waterless wet bulb sensing technology eliminates daily maintenance
  • Convenient stay time parameters per multiple standards help determine work-rest ratios
  • IP 54 ingress rating helps protect unit from exposure to dirt, dust, oil and water
  • Designed to withstand the rigors of everyday use in demanding environments
MeasurementsGlobe, dry bulb temperature, wet bulb temperature, % relative humidity, WGBTin, WGBTout, WGBT weighted average (if 3 sensor sets), and Heat Index / Humidex.
Temperatures given in Celsius or Fahrenheit.
Data LoggingRecords and prints all measurements at user selected interval of 1, 2, 5, 10, 15, 30, or 60 minutes. 128K bytes of data memory.
LanguagesEnglish, French, Spanish, Italian, German.
HousingDesigned water resistant to a light rain or mist. If rain is frequent, best practice would be to remote the sensor bar and keep the instrument sheltered.
SizeHeight9.2 in. (23.5 cm)
Width7.2 in. (18.3 cm)
Depth3.0 in. (7.5 cm)
Dimensions include mounted sensor assembly.
Weight2.6 lbs. (1.2 kg) with mounted sensor assembly.
Sensor TypesTemperature1000 ohm platinum RTD
HumidityIntegrated circuit with capacitive polymer sensor
AccuracyDry Bulb and Globe Temperature±0.5 C between 0 C and 120 C
Waterless Wet Bulb TemperatureExpanded measurement uncertainty of 1.1 C (k=2) between 0 C and 80 C
Relative Humidity±5% between 20 to 95% (non-condensing)
Operating Temperature RangeSensor Assembly-5 C to +100 C
Electronics-5 C to 60 C
Remote Sensor Bars2 x 15-pin D-sub jacks are located on the side of the unit for plugging in one or two additional sensor bars by using remote cables up to 200 feet (61 m). The top sensor bar can also be remote with a cable.
Power Options9V alkaline, 7.2V NiMH rechargeable pack (charged in the unit), or AC adapter wall power cube (AC adapter will operate the unit or recharge the NiMH battery pack).
Battery Life9V alkaline80 hours
Rechargeable Nickel Metal Hydride160 hours
(Adding additional sensor bars reduces battery life.)
Charge Time (NiMH Battery Pack)16 hours (charge in the unit)
Air Probe AccessoryRange0-20 meters per second. 0.1 m/s increments
SensorOmni directional heated thermistor
Accuracy±(0.1 m/s + 4%) of measurement value
Battery Life6-8 hours for fully charged NiMH battery
Charge Time9 hours
Measurement ParametersQT°44QT°46QT°48N
Dry bulb, wet bulb and globe temperatures+++
Air Velocityoptional
WBGT (indoor index)++
WBGT (outdoor index)+++
Heat index / HUMIDEX++
Temperature reading: Celsius or Fahrenheit+++
Data logging intervals: 1, 2, 5, 10, 15, 30 or 60 minutes+++
Event logging mode+
Time & date stamping with clock and calendar+++
Displayed stay times: ACGIH TLV, U.S. Navy PHEL charts, U.S. Navy/Marine Corp. Ashore Flag Conditions, EPRI action limits (QT°48N excludes EPRI)++
Head-Torso-Ankle Weighted Average WBGT (optional with tri-sensors)optionaloptional