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Safety and Technical Manual
Rev: 2
Form No. F_020521
VSF303 Flame Detector
This document is strictly private and confidential, reproduction without Viking Corporation approval is prohibited. © 2021 The Viking Group Inc.
EN 54-part 10 Limitation of use
The VSF303 is not approved for use in oxygen-enriched atmospheres.
As the VSF303 responds to flame, it cannot be used in locations where flare stacks are within its
field of view or a reflected view is present without triggering alarms.
As the VSF303 responds to CO
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emissions of a flame the VSF303 cannot detect non-hydrocarbon
fires, such as those using pure hydrogen, silane, and sulphur as fuel.
The sensitivity of the VSF303 is reduced by obscurants such as smoke, fog, and other airborne
particulates. The VSF303 may be blinded by extremely dense obscurants.
Arc welding should not take place within 32 ft (10 m) of the VSF303 when using the highest
sensitivity setting.
3 Installation
The VSF303 design has been developed to allow simple installation. The detector comprises two
key components, the detector enclosure, and the detector internal assembly. The detector assembly
located in the front of the enclosure should not be removed except by trained personnel.
Unauthorized removal or disassembly of the detector assembly will invalidate the warranty. Only the
rear end cap can be removed for terminal access.
Detector Enclosure
The detector electronics are housed in an enclosure certified for use in hazardous areas. For the
exact certification and conditions of use see certification label on the device, or the example drawing
below:
The detector comprises the front window cover including the window, the rear enclosure cover, the
enclosure body, certification rating label (see above) and the mounting bracket.
The flame detector is supplied preassembled and includes the mounting bracket. However, it is not
supplied with a mounting support and fixings, cabling, or glands.
Mounting & Orientation
The mounting bracket allows the detector’s vertical orientation to be adjusted from 0 to 45° and
allows a horizontal rotation of +/-45° when mounted from above.
Figure 1: Detector Mounting Bracket
