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INTRODUCTION
The SIEMENS DF-30 and DF-30A detectors (See Figure 1) are
plug-in, two-wire flame detectors which respond to ultraviolet radia-
tion. The detectors use an ultraviolet sensitive gas filled tube to see
a flame.
When activated, the DF-30 has a 5-second delay before alarm; the
DF-30A delays 10 seconds before alarm. If the activating radiation
is not sustained for the delay period, the detector sees it as an inci-
dental light (not a fire) and does not alarm.
Figure 1
2
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