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slot with Isobutylene selected from the Preset RF library. Refer to Section:
Response Factors and Memory Slots for further information.
Sample Mode
The 2020PROPlus can be used to collect samples for further analysis at another
location with another instrument (e.g., back at a laboratory using a GC). Sample
collection is conducted utilizing the optional Photovac Tube Holder (A1790500) and
sample collection tubes. On selection of SAMPLE MODE from the UNIT SET UP
menu, the pump will shut off and the user will be instructed to attach the TUBE
HOLDER and fresh SAMPLE TUBE. The SAMPLE soft key will activate the
pump for a short period of time drawing ambient air into the SAMPLE TUBE.
When finished, the user will be prompted to either continue sampling or return the
2020PRO
Plus to normal operating mode.
Figure 15. Sample Collection Mode
Response Factor Library
The response of a PID to a compound is dependent on its ionization potential. In
certain situations when the user is confident that only a single specific compound
exists, they can set up the 2020PRO
Plus using an isobutylene calibration to mimic
the 2020PRO
Plus response as if the 2020PROPlus was calibrated using that specific
single compound.
General Information
In situations where only a single pure compound is present in air, the 2020PROPlus
should be calibrated with a standard of that specific compound as span gas. The
2020PRO
Plus’s 15 memory slots can be used to store calibration information for 15
different span gases.
The 2020PRO
Plus will always detect all ionizable compounds present in a sample
regardless of the response factor (RF) selected.
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