Ashcroft A Series - N4 Pressure Switch Bedienungsanleitung PDF herunterladen (Seite 3)

A-SERIES SWITCH SAFETY MANUAL

I&M009-10210

REV A - 4/19/2013

1.2 Acronyms

FMEDA Failure Modes, Effects and Diagnostic Analysis

HFT Hardware Fault Tolerance

MOC Management of Change. These are specific procedures often

done when performing any work activities in compliance with

government regulatory authorities.

PFDavg Average Probability of Failure on Demand

SFF Safe Failure Fraction, the fraction of the overall failure rate of

a device that results in either a safe fault or a diagnosed

unsafe fault.

SIF Safety Instrumented Function, a set of equipment intended

to reduce the risk due to a specific hazard (a safety loop).

SIL Safety Integrity Level, discrete level (one out of a possible

four) for specifying the safety integrity requirements of the

safety functions to be allocated to the E/E/PE safety-related

systems where Safety Integrity Level 4 has the highest level

of safety integrity and Safety Integrity Level 1 has the lowest.

SIS Safety Instrumented System – Implementation of one or more

Safety Instrumented Functions. A SIS is composed of any

combination of sensor(s), logic solver(s), and final element(s).

1.3 Product Support

Product support can be obtained from:

Ashcroft Inc., 250 East Main St., Stratford Ct. 06614

www.ashcroft.com

(203) 378-8281

1.4 Related Literature

Hardware Documents:

• Ashcroft A-Series Switch Installation, Operation and Maintenance

Instructions

Guidelines/References:

• Safety Integrity Level Selection – Systematic Methods Including Layer of

Protection Analysis, ISBN 1-55617-777-1, ISA

• Control System Safety Evaluation and Reliability, 2nd Edition, ISBN 1-

55617-638-8, ISA

• Safety Instrumented Systems Verification, Practical Probabilistic

Calculations, ISBN 1-55617-909-9, ISA

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Ashcroft A Series - N4 Pressure Switch Bedienungsanleitung Seite 3