INFICON 2020ComboPRO Portable Photoionization Detector - Manual (Page 40)

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2020ComboPRO Overview
Figure 1. The 2020ComboPRO Instrument
The 2020ComboPRO measures the concentration of airborne gases and vapors that
can be ionized by a photoionization detector. The 2020ComboPRO automatically
displays and can record, these concentrations. In TVOC mode, the
2020ComboPRO does not distinguish between individual compounds. The
reading displayed represents the total concentration of all photoionizable chemicals
present in the sample. In GAS mode, 2020ComboPRO is able to measure benzene
when the benzene pre-filter tube holder and benzene pre-filter tube are installed.
The 2020ComboPRO display updates itself once per second. You can read
concentrations directly from the display. The 2020ComboPRO is factory-set to
display concentration in units of ppm, and concentrations can be displayed in ppb or
mg/m
3
.
The 2020ComboPRO 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 2020ComboPRO 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 memory of the
2020ComboPRO. The 2020ComboPRO can log up to 12,000 entries.
In Tag mode operation, the 2020ComboPRO prompts you to locate a site and then to
record a background and sample readings for the site. You can record up to 12,000
manual entries. There is no averaging of data in Tag mode.