Using a Waterless Wet Bulb calculation, an algorithm utilizes temperature and humidity readings to calculate the wet bulb equivalent temperature and to compute the WBGT. Wet-bulb globe temperature (WBGT) is a recognized method to monitor environmental conditions related to heat stress. The Waterless Wet Bulb calculation provides WBGT readings without the maintenance of adding water to the wet bulb sensor.
The QUESTemp° 44 and 46 heat stress monitors provide simplified heat stress management with high quality product features. Both models measure/calculate the dry bulb, wet bulb, and globe temperatures along with WBGT indoors, WBGT outdoors, relative humidity and Heat Index/Humidex. A real time clock provides accurate reporting with time stamping. On board data logging along with QuestSuite Professional II software allows for advanced analysis of data with charting, graphing and reporting options.
QUESTempº 44/46 Specifications
Globe temperature, dry bulb temperature, wet bulb temperature calculated, % relative humidity, WBGTin, WBGTout, WBGT weighted average (if 3 sensor sets), and Heat Index / Humidex. Temperatures given in Celsius or Fahrenheit.
Records and prints all measurements at user selected interval of 1, 2, 5, 10, 15, 30, or 60 minutes. 128K bytes of data memory.
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Designed 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.
Height 9.2in (23.5cm); Width 7.2in (18.3mm); Depth 3.0in (7.5mm) Dimensions include mounted sensor assembly
2.6 lbs. (1.2 kg) with mounted sensor assembly
Temperature: 1000 ohm platinum RTD
Humidity: Integrated circuit with capacitive polymer sensor
Dry Bulb and Globe Temperature: +/-0.5ºC between 0ºC and 100ºC
Waterless Wet Bulb Temperature calculated: Expanded measurement uncertainty of 1.1ºC (k=2) between 0ºC and 80ºC
Operating Temperature Range
Sensor Assembly: -5ºC to +100ºC
Electronics: -5ºC to 60ºC
Operating Relative Humidity Range
+/- 5ºC between 20 to 95% (non-condensing)
Remote Sensor Bars
2 x 15pin D-sub jacks are located on the side of the unit for plugging in 1 or 2 additional sensor bars by using remote cables up to 200 feet (61m). The top sensor bar can also be remote with a cable.
9V alkaline, 7.2V NiMH rechargeable pack (charged in the unit), or AC adapter wall power cube (AC adaptor will operate the unit or recharge the NiMH battery pack)
9V alkaline: 80 hours
Rechargeable Nickel Metal Hydride: 160 hours (Adding 2nd and 3rd sensor bar will decrease battery life)
Charge Time (NiMH Battery Pack)
16 hours (charge in the unit)
Air Probe Accessory
0 - 20 meters per second. 0.1m/s increments
Omni directional heated thermistor
+/- (0.1 m/s + 4%) of measurement value
6 - 8 hours for fully charged NiMH battery