INFICON 2020ppbPRO Portable Photoionization Detector - Manual (Page 56)

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Figure 12. Interval time adjustment
Interval simultaneously displays the STEL, TWA, and PEAK reading along with the
instantaneous reading. The 2020ppbPRO
’s datalogger can store up to 200 hours of
1 minute sample entries. The interval you select will determine the period of
operation. At the end of the period, the datalogger will be full and you will see the
“Data Log Full” status.
Table 2. Averaging Intervals and Period
STEL, TWA, and PEAK Operation
Averaging
Interval
(example)
Hours of Operation to
Fill the Datalogger
15 s 50
1 m 200
2 m 400
5 m 1000
15 m 3000
The 2020ppbPRO ’s display can show four values in Interval mode: STEL, TWA, and
PEAK, plus the instantaneous reading.
Erasing or Downloading Data
There are two options for data manipulation under the “Erase/Download” Data
selection.
“Clear Data Log” deletes all readings in the 2020ppbPRO memory.
NOTE: Deleted information cannot be recovered. You should play back and print or
download the contents of the datalogger before deleting any information.