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

ISP-074-575-P1D 49 49
Instrument Status
The instrument status is shown on the left of the first line of the status display. Each
status has a priority assigned to it. If more than one status is in effect, then the status
with the highest priority is displayed until the condition is corrected or until the
option is turned off. Table 1 is a list of the possible system alerts.
Table 1. System Alerts
2020ComboPRO Display Description
Concentration for zero air too high Zero gas too high
Concentration for span gas too high Span gas too low
Pump Error Pump fault
UV Lamp Error UV lamp fault
Blocked Filter Blocked sample inlet filter
Low Battery Icon Low battery
Data Log is Full Data memory full
PC Connected Instrument communicating with PC
Sensor Over Range Sample concentration over range
Alarm + R Icon Real time concentration alarm
Alarm + T Icon TWA concentration alarm
Alarm + S Icon STEL concentration alarm
System Alerts and Alarms
While operating the instrument, system alerts can occur. To accurately identify the
source of the alarm, each type of alarm has been given a unique status.
In addition to the status, the 2020ComboPRO also has an audio alarm and an alarm
LED. Different alarms are identified by the frequency at which the 2020ComboPRO
alternates between the audio and LED; Peak alarm is 5 times per second, STEL
alarm is 2.5 times per second, and TWA alarm is 1.25 times per second.
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 2020ComboPRO 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.