INFICON 2020ppbPRO Portable Photoionization Detector - Manual (Page 53)

ISP-074-576-P1D 47
A soft key is used for acknowledging alarms and is named “Accept”. If no alarm
exists, then the “Accept” key is not shown. To clear the alarm, press the “Accept”
key. Once acknowledged, the alarm indicators are cleared. The alarm status will
remain until the alarm condition clears.
The 2020ppbPRO updates the instantaneous concentration once every second.
Following every update, the instantaneous concentration is compared to the peak
alarm level, and if exceeded, an alarm is triggered.
In Interval mode, if a 15-minute average exceeds the STEL, a STEL alarm is
generated. The TWA alarm is generated when the current average of
concentration, since the TWA was last cleared, has exceeded the TWA exposure
limit.
During calibration, all alarms are disabled. Once the calibration is complete, the
alarms are re-enabled.
User Interface
– Basic Menu
The 2020ppbPRO is designed for ease of use with a logically organized internal
menu structure/user interface. The 2020ppbPRO User Menu is shown in Figures 6,
7, and 8.
The 2020ppbPRO has three soft keys under the graphic LCD display which always
show the available functions of the soft keys in any screen.
Operation Modes
Logging Off Mode
Logging Off mode is identified by the word “LOG” with a diagonal line through the
word “LOG” in the upper right corner of the 2020ppbPRO display. Logging Off will
continuously display the concentration of total volatile compounds present that the
2020ppbPRO can ionize. The reading is updated approximately once per second. In
Logging Off mode, the only soft key displayed is MENU.
MENU selects the 2020ppbPRO ’s internal menu for the instrument setup by the
user.
Tag Mode
Tag mode is identified by the word “TAG” in the upper right-hand corner of the
2020ppbPRO display. Tag mode will continuously display the instantaneous
concentration of total volatile compounds. Tag mode also allows the user to
manually tag and datalog readings. Tag mode allows the user to datalog a
background reading, a sample reading and assign Site Codes to readings. Site
Codes are set using the 2020ppbPRO Comm software. See Chapter 4, Connecting
Accessories, for more information on how to use the 2020ppbPRO Comm software.
In Tag mode, the soft keys are VIEW, TAG and MENU.