PerkinElmer Photovac 2020, Manual

Page: 48 / 190

2020 Software Manual
46
Table 1 Instrument Status
Alarms
While operating the instrument, any one of three alarm conditions
can occur. To accurately identify the source of the alarm, each type
of alarm has been given a unique status. See
Table 1 .
In addition to the status, 2020 also has an audio alarm and an alarm
LED. To conserve power the 2020 alternates between the LED and
audio. Different alarms are identified by the frequency at which the
2020 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.
The left soft key is used for acknowledging ala rms, and is named
“Ack”. If no alarm exists, then the “Ack” key is not shown. To
clear the alarm, press the “Ack” key. Once acknowledged, the
alarm indicators are cleared. The alarm status will remain until the
alarm condition clears.
2020 updates the peak concentration once every second. Following
every update, the peak concentration is compared to the peak alarm
level, and if exceeded, an alarm is triggered.
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.
STEL, TWA, MAX and PEAK Operation
The 2020’s meter display can be configured to show one of 4
values: STEL, TWA, PEAK and MAX.