9
Safety Manual
00809-0400-5100, Rev AB
Installation and Configuration
November 2019
Installation and Configuration
2.3 Configuration in SIS applications
2.3.1 Analog output configuration
Alarm and saturation levels
DCS or safety logic solver should be configured to handle both High alarm and Low alarm. It
is also required that the transmitter is configured for High or Low alarm. Figure 2-1
identifies the alarm levels available and their operation values.
Figure 2-1. Alarm Levels and Operation Values
It is assumed that the current output signal is fed to a SIL 2-compliant analog input board of
a safety logic solver.
Note
Only the High or Low Alarm Mode can be used for the safety function. Do not choose Freeze
Current.
Note
A Low Alarm will be triggered in case of a hardware fault on the Analog Output card.
Rosemount Alarm Level
Normal Operation
3.75 mA
(1)
1. Transmitter Failure, hardware or software alarm in Low position.
4 mA 20 mA 21.75 mA
(2)
3.9 mA
low saturation
20.8 mA
high saturation
Namur Alarm Level
Normal Operation
3.6 mA
(1)
4 mA 20 mA 22.5 mA
(2)
2. Transmitter Failure, hardware or software alarm in High position.
3.8 mA
low saturation
20.5 mA
high saturation
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