Form creation date: 01.04.2008
Document creation date: 13.01.2020
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3.2 PPM and VOL measuring ranges
The METREX2 has the two measurement scales PPM and VOL%.
After switching the instrument on it starts automatically in the PPM range.
The PPM range visualizes concentrations from 0 to 9900 PPM (parts per million),
whereas the volumetric scale measures from 0 to 100%.
A changeover between the two ranges is possible by pressing the PPM/VOL button
(4) (fig.1 and fig.7).
If a concentration of 1% VOL occurs while working in the PPM range, the instrument
automatically changes over to the volumetric range. Inversely a changeover from
the volumetric to the PPM scale is only possible by pushing the PPM/VOL button
and is not executed automatically. Furthermore, a changeover from VOL to PPM is
only possible if the gas concentration is below 10000 ppm (1%). When the
volumetric range is chosen, the corresponding LED (10) (fig.1 and fig.8) is lit.
fig. 7
fig. 8
3.3 LEL measuring range
The METREX2 has the LEL scale (fig.10) which is activated by pressing the PPM/VOL
button (4) (fig.1 and fig.9) for more than 2 seconds. If the acoustic alarm is
activated, a signal tone is emitted. A changeover from the LEL scale is only possible
manually. For switching back to the PPM or VOL range the same button has just to
be pushed briefly.
fig. 9
fig. 10
For CH
4
, the measuring LEL range (0-
100%) corresponds to a range of 0-5%
(100% LEL = 5% VOL) of the volumetric
scale.
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