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Information in this guide is given in good faith, but the manufacturer cannot be held responsible
for any omissions or errors. The company reserves the right to change the specifications of
products at any time and without prior notice.
This document is FD User Manual/2003/Issue 1
12
Fire & Security Solutions
Flame Detector
User Manual
General
Description
The flame detector is designed for use where open flaming fires may be expected. It responds to the
light emitted from flames during combustion. The detector discriminates between flames and other
light sources by responding only to particular optical wavelengths and flame flicker frequencies. This
enables the detector to avoided false alarms due to such factors as flicking sunlight.
Electrical Considerations
The flame detector can be connected in many different electrical configurations depending on the
application. The detector requires a 24Vdc (14Vmin. to 30Vmax.) supply to operate. The detector can
be connected as a two-wire loop powered device increasing its supply current to signal that a flame
has been detected. See Fig 8. The supply connections to the detector are polarity sensitive.
Also available are volt free contacts from two internal relays RL1 (Fire) and RL2 (Fault or pre-alarm).
Using the relay contacts connected in a four-wire configuration the detector status can be signalled
back to control equipment. See Fig 9.
Removing the detector front cover provides accesses the detector terminals and configuration DIL
switch. See Fig.4.
Alarm Response Modes
The detector is normally configured to latch into an alarm state when a flame is detected. The supply
to the detector has to be broken in order to reset the detector.
The configuration DIL switch within the detector can be set to place the detector into a non-latching
mode. The detector can then also produce proportional analogue current alarm signals i.e. 8-28mA or
4-20mA. In non-latching mode the detector only produces an alarm signal when a flame is in view
resetting itself to normal when the flame has gone.
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Table of Contents
Summary of Contents for SenseTek Flame Detector
- Page 1 General Description The flame detector is designed for use where open flaming fires may be expected. It responds to the light emitted from flames during combustion. The detector discriminates between flames and other light sources by responding only to particular optical wavelengths and flame flicker frequencies. This enables the detector to avoided false alarms due to such factors as flicking sunlight.
- Page 2 The flame detector is designed to have a class 1 performance as defined in BS EN54-10:2002 on the high sensitivity setting. That is the ability to detect an n-heptane (yellow) fire of 0.1m² or methylated spirit (clear) fire of 0.25m²...
- Page 3 In fact, the flame detector will detect fires at distances of up to 40 metres, but the flame size at such distances needs to be proportionally greater in order to be sure of reliable detection. Thus the yellow flickering flame that can be detected at 25m, provided that its size is not less than 0.1m², will have to be 0.4m²...
- Page 4 (i) to suit control systems. The flame detector is not affected by normal light sources but should be positioned so that sunlight does not fall directly onto the viewing window.
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Page 5: Theory Of Operation
Electrical Connections The flame detector has eight connection terminals as show in Fig 5. Removing the front cover of the flame detector accesses the connections. The cable is passed through the gland holes in the base of the detector. - Page 6 Function 1 2 3 4 5 6 7 8 Power Supply +V. +IN is the power supply input to the flame detector and is normally 24Vdc with respect to terminal 2. The current consumption of detector can be monitored to determine the detector Fig 6 DIL Switch with Detector Front Cover Removed (Normal factory settings shown) status (Fault, Normal, Pre-alarm, Fire).
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