Vaisala DRYCAP DM70 Guia do Utilizador descarregar pdf (Página 64)

USER'S GUIDE____________________________________________________________________

0405-011

Figure 29 Gas Collection Option

The following numbers refer to Figure 29 above.

1 = Gas from GIE

2 = Gas to the collecting system

Operating Environment

A typical dewpoint of pure SF

is usually around -60 °C. The

recommendations for the moisture limit of the equipment insulated

with gas (GIE) vary between

70 ... 810 ppm

, which corresponds to -45 ... -22 °C T

d/f

in the

atmospheric pressure, or -29 ... -3 °C T

d/f

in 5 bar

pressure. DM70 is

able to measure the dewpoint directly in the GIE pressure (usually 3 ...

8 bar

), or the gas can be sampled and measured in the atmospheric

pressure. If there is a need to measure high-pressure gas (>10 bar), for

example in the recycling bottle, a regulator should be used to drop the

pressure before the measurement.

High-voltage equipment can locate either indoors or outdoors. The

operational temperature range of DM70 is between -10 ... +60 °C.

Measuring

CAUTION

Before measuring moisture, make sure that hydrofluoric (HF) acid is

not present in the GIE.

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Vaisala DRYCAP DM70 Guia do Utilizador Página 64