Quest Diagnostics QUESTEMP 36 User Manual
9. PC COMMUNICATIONS
°36 has the flexibility to be set up and controlled through
computer software. The programmable start and stop time feature is only
accessible through the computer. The instrument also has the capability of sending
live data while measuring. These features are best utilized using QuestSuite
software. To write custom software for working with the QUESTemp
Quest Technologies for the programming commands.
NATURAL WET BULB THERMOMETER
The natural wet bulb thermometer gives an indication of the effects of
humidity on an individual. Relative humidity and wind speed are taken into
account by measuring the amount of evaporative cooling taking place at a
thermometer covered with a moistened wick. 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.
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 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.
DRY BULB THERMOMETER
The dry bulb thermometer measures the ambient air temperature. This
measurement is used in the outdoor WBGT calculation when a high solar
radiant heat load may be present. The series of white plates surrounding the
sensor shield it from radiant heat.
RELATIVE HUMIDITY SENSOR
A relative humidity sensor is located in a compartment inside of the sensor bar
housing. Slots in the housing allow air to circulate around the sensor.
(Available using Quest’s Air Probe)
Airflow is measured in meters per second over a range of 0 to 20m/s in 0.1m/s
increments. The sensor should be placed or held perpendicular in the air stream.
Unlike many anemometers, the omni-directional sensor does not require rotating
to find the maximum reading. Be careful not to block the airflow with your
body during measurements. The sensor’s measuring tip is fragile; be cautious if
measuring in ducts.
The Air Probe may be either hand held or mounted behind the Questemp
using the mounting bracket hooked to the sensor bar beneath the wet bulb.
A green lamp indicator in the Air Probe indicates that it is turned on and the
battery is good. If the green indicator turns off while the switch is in the ON
position, replace or recharge the battery.