Functional Safety Manual
for the Memosens transmitter Liquiline M CM42 SIL
Version: Page:
2.0
4 of 72
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TABLE OF CONTENTS
1 Structure of measuring system using a CM42 SIL transmitter 6
1.1 System Components 6
1.2 Description of the application as a safety related system 7
1.3 Valid device types 9
1.4 Applicable device documentation 10
2 Description of safety requirements and boundary conditions 10
2.1 Safety Function (SAF) – SIL measuring mode 10
2.1.1 Safety Function 1 (SAF1) – limit value monitoring 11
2.1.2 Safety Function 2 (SAF2) – safe measurement 13
2.1.3 Precision and Timing of SAF1 and SAF2 13
2.1.4 Safe calibration and adjustment (SAF3 and SAF4) 15
2.2 Safety-related signal and safe state 15
2.3 Restrictions for the use in safety related applications 18
2.4 Behavior of the device when in operation and in case of failure 24
2.4.1 Behavior of the device when switched on 24
2.4.2 Behavior of the device on demand 24
2.4.3 Behavior of the device in the event of alarms and warnings 25
3 Installation 26
3.1 Mounting, wiring and commissioning 26
3.2 Orientation 26
4 Operation 26
4.1 Basics of safety relevant operations 26
4.2 Calibrating the measuring point 26
4.3 Method of device parameterization 27
4.4 Using the SIL mode and the Classic mode – Switch to SIL mode 27
4.5 The SIL mode – Active safe state mode 33
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