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Functional Safety Manual
IP101/FSM, Rev AA
January 2012
Horizontal Float Switch
Magnetic Level Switch Functional Safety Manual
INTRODUCTION
Scope and Purpose of the Safety Manual
This safety manual contains the information to design, install, verify and maintain a Safety Instrumented Function (SIF) utilizing the Mobrey magnetic level switch.
The manual provides the necessary requirements to enable the integration of the horizontal
Skill Level Requirement
Terms, Abbreviations, And Acronyms
NOTE:
For product support, use the contact details on the back page.
System design, installation and commissioning, and repair and maintenance shall be carried out by suitably qualified personnel.
Basic Safety
Freedom from unacceptable risk of harm.
BPCS
Basic Process Control System – a system which responds to input signals from the process, its associated equipment, other programmable systems and/or an operator and generates output signals causing the process and its associated equipment to operate in the desired manner but which does not perform any safety instrumented functions with a claimed SIL greater than or equal to 1.
Fail-safe State
State where switch output is in the state corresponding to an alarm condition. In this condition the switch contacts will normally be open.
Fail Dangerous
Failure that does not respond to an input from the process (i.e. not switching to the
Fail Dangerous Detected
Failure that is dangerous but is detected.
Fail Dangerous Undetected
Failure that is dangerous and that is not detected.
Fail No Effect
Failure of a component that is part of the safety function but that has no effect on the safety function.
Fail Safe
Failure that causes the switch to go to the defined
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