Spectrex 40/40U-UB - UV Flame Detector - Manual (Page 78)

SharpEye TM UV Flame Detector User Guide
66 40/40UB Flame Detector
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.
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.
E.1.2.4 Other
1 The complete function of the flame detector (flame detection, function of
the 0-20mA interface, the relays) must be examined at least every six or
twelve months (see Safety Relevant Parameters on page 65, when the
flame detector must be switched OFF and ON.
2 The window of the sensor must be examined at appropriate time
intervals for partial contamination.
3 The HART and the interfaces must not be used for the transmission of
the safety-related data.