INFICON 2020ppbPRO Portable Photoionization Detector - Manual (Page 38)

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2020ppbPRO Overview
Figure 1. The 2020ppbPRO Instrument
The 2020ppbPRO measures the concentration of airborne gases and vapors that
can be ionized by a photoionization detector. The 2020ppbPRO automatically
displays and can record these concentrations. The 2020ppbPRO does not
distinguish between individual compounds. The reading displayed represents
the total concentration of all photoionizable chemicals present in the sample. The
2020ppbPRO displays concentrations in units of ppb as well as ppm and Mg/M
3
.
The 2020ppbPRO operates automatically. The 2020ppbPRO display updates itself
once per second. You can read concentrations directly from the display.
The 2020ppbPRO will perform short-term exposure limit (STEL), time-weighted
average (TWA) and PEAK calculations when it is in INTERVAL mode. You can view
any of these results in INTERVAL mode.
The 2020ppbPRO has two datalogging options, Tag and Interval mode. Tag mode
allows the user to manually tag and store readings during a walkthrough. Interval
mode allows the user to datalog at selectable intervals of 1 second to 999 seconds.
In Interval mode, the STEL, PEAK and TWA are calculated. If you select Interval
mode, these values are automatically recorded in the 2020ppbPRO
’s memory. The
2020ppbPRO can log up to 12,000 entries.