Spectrex SharpEye 40/40I, User Manual

Page: 84 / 85

SharpEye
TM
IR3 Flame Detector User Guide
84 40/40I Flame Detector
E.1.2.1
Conditions for Safe Operating
 The flame detector must consist only of the approved hardware and
software modules.
 The 24V power supply must fulfill the requirements for PELV/SELV of EN
60950.
 The automatic BIT (Built-In-Test) must be activated.
 The setup parameters must be verified (as described in
Using the 0 – 20mA Interface for Alerting on page 84, point ‎ ; and in
Using the Alarm Relay Contact for Alerting
on page 84, point ‎ ). The
function of the 40/40 Flame Detector (flame detection, function of the
0
– 20mA interface, and relay functions) must be checked completely.
E.1.2.2
Using the 0
–
20mA Interface for Alerting
 The following parameters should be set:
 Automatic BIT test = on
 Connected to 0 – 20mA Terminals
 The following allowed output current must be supervised with an
accuracy of ± 5%:
 Normal State = 4mA
 Warning State = 16mA
 Alarm State = 20mA
 The receiving device must be programmed to indicate a fault condition
when current levels reach overcurrent or undercurrent.
 The 0 – 20mA can be used as low and high demand mode.
E.1.2.3
Using the Alarm Relay Contact for Alerting
 The following parameters should be set:
 Automatic BIT Test = on
 Connected to N.C. contact of alarm relay terminals
 Connected to fault relay terminals
 T he relay contacts (“alarm” and “faulty relay”) must be protected with a
fuse rated at 0.6 of the nominal specified relay contact current.
 The maximum contact rating that is allowed per SIL-2 is 30VDC.
 The contact of the alarm relay opens if there is a fire alarm.
 During the forwarding and evaluation of the alarm, the relay contact
opens.
 The alarm relay can be used as low demand only.
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