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Wiring Procedure
The wiring terminals are in the rear section of the detector enclosure and are accessible by removal
of the end cap.
The front section of the enclosure should only be accessed by trained personnel.
The terminal schematic detailed below shows the view looking inside the detector following removal
of the end cap.
Figure 4: Terminal Schematic
The detector has two types of alarm output available.
•
0-20mA (source, non-isolated)
•
Relay (Alarm & Fault)
Listed below are wiring options dependent on the functional requirements of the detector.
Note: Information below describes how to access RS485 communication by reversing the
polarity of the power when there is no dedicated RS485 pair, or the detector is in HART®
mode. This operation will disable the signal return to the control system whilst enabled. Care
should be taken after using this facility to return the detector to normal operation.
This document is strictly private and confidential, reproduction without Viking Corporation approval is prohibited. © 2021 The Viking Group Inc.
VSF301 Flame Detector
Safety and Technical Manual
Form No. F_020621
Rev: 2
11
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