Spectrex 40/40I Triple IR (IR3) Flame Detector - Manual (Page 78)

SharpEye TM IR3 Flame Detector User Guide
66 40/40I Flame Detector
E.1.2.1 Conditions for Safe Operating
1 The flame detector shall consist only of the approved hardware and
software modules.
2 The 24V power supply must fulfill the requirements for PELV / SELV of
EN 60950.
3 The automatic BIT (Built-In-Test) must be activated.
4 The set-up parameters must be verified (as described in
Using the 0-20mA Interface for Alerting on page 66, point 1 and in Using
the Alarm Relay Contact for Alerting on page 66, point 1) and the
function of the 40/40 Flame Detector (flame detection, function of the
0-20mA interface, relay functions) must be checked completely.
E.1.2.2 Using the 0-20mA Interface for Alerting
1 The following parameters shall be set:
 AUTOMATIC BIT test = on
 Connected to 0-20mA Terminals
2 The following allowed output current must be supervised with an
accuracy of ± 5%:
 Normal State = 4mA
 Warning State = 16mA
 Alarm State = 20mA
3 The output current must be supervised regarding the over-and under run
of the 0-20mA.
4 The 0-20mA can be used as low and high demand mode.
E.1.2.3 Using the Alarm Relay Contact for Alerting
1 The following parameters shall be set:
 AUTOMATIC BIT Test = on
 Connected to N.C contact of Alarm Relay Terminals
 Connected to Fault Relay Terminals
2 The relay contacts (“alarm” – and “faulty relay”) must be protected with
a fuse rated at 0.6 of the nominal specified relay contact current.
3 The maximum contact rating that is allowed per SIL-2 is 30VDC.
4 It is to be considered that the contact of the Alarm Relay opens if there
is a fire alarm.
5 During the forwarding and evaluation of the alarm it must be noted that
the relay contact opens.
6 The alarm relay can be used as low demand only.