Rki-instruments GX-2001 Manual Manual de usuario descargar pdf (Pagina 26)

21 • Displaying and Setting the Alarm Points Model GX-2001 Operator’s Man-

Displaying and Setting the Alarm

Points

The Model GX-2001 allows you to display and set the alarm points of the

four target gasses. Each of the target gasses has both a low (Alarm 1) and

high (Alarm 2) alarm setting. Two gasses, CO and H

S, have STEL and

TWA alarm points. The alarm point for oxygen is measured as a

percentage of oxygen in the atmosphere. The alarm point for HC is

measured as a percentage of the lower explosive limit (% LEL), and CO

and H

S alarm points are measured in parts per million (ppm). The alarm

points and their factory settings are summarized in the table below:

In the table above, Alarm 1 and Alarm 2 for HC, CO, and H

S refer to a

rising concentration of these gasses. The first alarm is triggered at the

Alarm 1 concentration listed in the table. For HC that would be 10% LEL,

for CO that would be 25 ppm, and for H

S that would be 10 ppm. The

second alarm is triggered when the Alarm 2 concentration is reached. For

oxygen, Alarm 1 is triggered when the concentration of oxygen falls below

19.5%. When the concentration of oxygen rises above 23.5%, Alarm 2 is

activated.

Table 5: Alarm Points of the Four Target Gasses

Gas Alarm 1 Alarm 2 STEL TWA

19.5%

Decreasing

23.5% None None

Combustible

10% LEL 50% LEL None None

CO 25 ppm 50 ppm 200 ppm 25 ppm

S 10 ppm 30 ppm 15 ppm 10 ppm

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 44 45

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Rki-instruments GX-2001 Manual Manual de usuario Pagina 26