SharpEye 20 Betriebsanweisung PDF herunterladen (Seite 48)

E.1.2 Guidelines for Configuring, Installing, Operating and Service

The alert conditions according to SIL 2 can be implemented by an:

• Alert signal via 20mA current loop

• Alert signal via alarm relay and the fault relay

E.1.2.1 Conditions for Safe Operating

48 The flame detector shall consist only of the approved hardware and software modules.

49 The 24V power supply must fulfill the requirements for PELV / SELV of EN 60950.

50 The automatic BIT (Built-In-Test) must be activated.

51 The set-up parameters must be verified (as described in Using the 4-20mA Interface

for Alerting on page 49, point 52 and in Using the Alarm Relay Contact for Alerting

on page 49, point 56) and the function of the 40/40 Flame Detector (flame detection,

function of the 4-20mA interface, relay functions) must be checked completely.

E.1.2.2 Using the 4-20mA Interface for Alerting

52 The following parameters shall be set:

• AUTOMATIC BIT test = on

• Connected to 4-20mA Terminals

53 The following allowed output current must be supervised with an accuracy of ± 5%:

• Normal State = 5mA

• Warning State = 10mA

• Alarm State = 15mA

54 The output current must be supervised regarding the over-and under run of the 4-

20mA.

55 The 4-20mA can be used as low and high demand mode.

E.1.2.3 Using the Alarm Relay Contact for Alerting

56 The following parameters shall be set:

• AUTOMATIC BIT Test = on

• Connected to N.C contact of Alarm Relay Terminals

• Connected to Fault Relay Terminals

57 The relay contacts (“alarm” – and “faulty relay”) must be protected with a fuse rated

at 0.6 of the nominal specified relay contact current.

58 The maximum contact rating that is allowed per SIL-2 is 30VDC.

59 It is to be considered that the contact of the Alarm Relay opens if there is a fire alarm.

60 During the forwarding and evaluation of the alarm it must be noted that the relay

contact opens.

61 The alarm relay can be used as low demand only.

E.1.2.4 Other

62 The complete function of the flame detector (flame detection, function of the 4-0mA

interface, the relays) must be examined at least every six or twelve months (see Safety

Relevant Parameters on page 48, when the flame detector must be switched OFF and

ON.

63 The window of the sensor must be examined at appropriate time intervals for partial

contamination.

64 The HART and the RS 485 interfaces must not be used for the transmission of the

safety-related data.

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