Spectrex Xenon 700 SIL Open-Path Gas Detection System - Manual (Page 74)

SafEye TM Xenon 700S SIL Gas Detector
62 Miscellaneous
C.2.2 Alarm Operation using the 0-20mA Signal Current
The connected controller has to monitor the 0-20mA signal current for valid
values: (see cap. Output Signals)
Mode
Normal Warning Alarm
Continuous current
with low sensitivity
(Full Scale: 5 LEL.m)
4 mA
(0 LEL.m) 7.2 mA
(1 LEL.m) 13.6 mA
(3 LEL.m)
Continuous current
with high sensitivity
(Full Scale: 2 LEL.m)
4 mA
(0 LEL.m) 7.2 mA
(0.4 LEL.m) 12 mA
(1 LEL.m)
Discrete current 4 mA 14 mA 19 mA
The connected controller has to monitor the 0-20mA signal current for
values below 4mA and above 20mA.
C.2.3 Relay Outputs
Relay outputs don’t comply with SIL2 requirements.
C.3 Miscellaneous
The complete functional performance of the gas detector has to be verified
half-yearly (gas detection, fault detection, performance of the 0-20mA
signal current and the relays), gas alarms ON and OFF.
The HART® and RS 485 interface are not allowed to be used for the
transmission of safety related data.