6 Using the product
44
• To avoid the effects of the CO
2
content of respired air, hold the
probe as far away from your body as possible.
• If sudden changes occur in the concentration, the probe will
require approx. 30 - 60 sec. to adapt to the environment. Gently
waving the probe reduces the adjustment period.
6.6.11. WBGT measurement
Measurement program available as of firmware version
1.05.
Make sure that the specific instrument and cable
temperatures are not exceeded. Extension cables should
be used for high radiation temperatures in particular.
With the WBGT set, the WBGT (Wet Bulb Globe Temperature)
climate index is determined as per DIN 33403 or ISO 7243. The
WBGT index is used to determine the maximum permissible
exposure time at workplaces exposed to heat (e.g. steel industry,
foundries, glass industry or blast furnaces).
To calculate the WBGT, 3 different temperatures must be
measured:
• Radiation temperature T
g
(globe thermometer)
• Ambient temperature T
a
• Wet bulb temperature T
nw
(temperature of a naturally ventilated
psychrometer)
The calculation is carried out with the following formulas:
WBGT = 0.7 x T
nw
+ 0.3 x T
g
WBGTS = 0.7 x T
nw
+ 0.2 x T
g
+ 0.1 x T
a
Preparing for measurement
✓ Globe thermometer, wet bulb temperature and air temperature
probes are connected and mounted on a tripod.
1. Switch the instrument on.
Selecting a suitable measuring point
The settings in the measuring point have no effects on the
measurement result.
Performing a measurement
✓ All points under "Preparing for measurement" have been carried
out.
1. Press [ ].
To Next Page
Loading...
