Endress+Hauser Proline Promag 300 - 3.1 System submenu

Design Proline Promag 300 HART
14 Endress+Hauser
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4.3 Notes on the redundant use of multiple sensors
This section provides additional information regarding the use of homogeneously redundant
sensors e.g. in 1oo2 or 2oo3 architectures.
The common cause factors β and β
D
indicated below are minimum values for the device. These
must be used when designing the sensor subsystem:
• Minimum value β for homogeneously redundant use: 2 %
• Minimum value β
D
for homogeneously redundant use: 1 %
The device meets the requirements for SIL 3 in homogeneously redundant applications.
If two sensors with an identical design (same type and same nominal diameter) are directly
connected to one another flange-to-flange, mutual acoustic interference cannot be entirely
ruled out. To fully rule out potential interference, it is recommended to install the sensors at
different points of the pipe or to insert a spacer between the two sensors. The spacer must be
at least half as long as the sensor.
NOTICE
Note the following if a fault is detected in one of the redundantly operated devices
during the proof test:
‣
Check the other devices to see if the same fault occurs there.
4.3.1 Safety-related output signal
The device's safety-related signal is the 4 to 20 mA analog output signal as per NAMUR NE43.
All safety measures refer to this signal exclusively.