Alarms; Stel, Twa, Max And Peak Operation; Table 1 Instrument Status - PerkinElmer Photovac 2020 Manual

Portable photoionization detector

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2020 Software Manual

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.

The 2020's meter display can be configured to show one of 4

values: STEL, TWA, PEAK and MAX.

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