3M WIBGET WB-300 Manuale d'uso - Pagina 6

Sfoglia online o scarica il pdf Manuale d'uso per Strumenti di misura 3M WIBGET WB-300. 3M WIBGET WB-300 14. Heat stress monitor

3 Sensors

Sensors

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 WB-300 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 WB-300 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.

As an option, a sensor array with a 6 inch diameter globe is available.

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.

A. Globe thermometer

B. Natural wet bulb thermometer

C. Dry bulb thermometer

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