Emerson Fisher 785C Instruction Manual Supplement
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Emerson Fisher 785C Instruction Manual Supplement

Emerson Fisher 785C Instruction Manual Supplement

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Instruction Manual Supplement
D104484X012
Safety Manual for Fisher
Purpose
This safety manual provides information necessary to design, install, verify, and maintain a Safety Instrumented
Function (SIF) utilizing the Fisher 785C actuator.
WARNING
This instruction manual supplement is not intended to be used as a stand-alone document. It must be used in conjunction
with the following manual:
Fisher 785C Actuator Instruction Manual (D104483X012)
Failure to use this instruction manual supplement in conjunction with the above referenced manual could result in personal
injury or property damage. If you have any questions regarding these instructions or need assistance in obtaining any of
these documents, contact your
Introduction
This manual provides necessary requirements for meeting the IEC 61508 or IEC 61511 functional safety standards.
Figure 1. Fisher 785C Actuator
www.Fisher.com
Emerson sales
office.
785C Double-Acting Springless Actuator
785C Actuators
™
785C Actuator
April 2019

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Summary of Contents for Emerson Fisher 785C

  • Page 1 Purpose This safety manual provides information necessary to design, install, verify, and maintain a Safety Instrumented Function (SIF) utilizing the Fisher 785C actuator. WARNING This instruction manual supplement is not intended to be used as a stand-alone document. It must be used in conjunction...

  • Page 2: Terms And Abbreviations

    785C Actuator Instruction Manual Supplement April 2019 D103398X012 Terms and Abbreviations Safety: Freedom from unacceptable risk of harm. Functional Safety: The ability of a system to carry out the actions necessary to achieve or to maintain a defined safe state for the equipment / machinery / plant / apparatus under control of the system. Basic Safety: The equipment must be designed and manufactured such that it protects against risk of injury to persons by electrical shock and other hazards and against resulting fire and explosion.

  • Page 3: Product Description

    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). Related Literature Hardware Documents: Bulletin: 61.2:785C, Fisher 785C Piston Actuator: D104412X012 Instruction Manual: Fisher 785C Piston Actuator: D104483X012 Guidelines/References: D Safety Integrity Level Selection –...

  • Page 4: Environmental Limits

    Environmental Limits The designer of an SIF must check that the product is rated for use within the expected environmental limits. Refer to the Fisher 785C Actuator Product Bulletin (D104412X012) for environmental limits. Application limits The 785C series actuator materials of construction are specified in the product bulletin. A range of materials for certain parts are available for various applications.

  • Page 5: Sil Capability

    Random Integrity The Fisher 785C series actuator is classified as a Type A device according to IEC 61508, having a hardware fault tolerance of 0. The complete final element subsystem, with a 785C series actuator and sliding stem valve as the final control element, will need to be evaluated to determine the Safe Failure Fraction of the subsystem.

  • Page 6: Physical Location And Placement

    April 2019 D103398X012 The Fisher 785C series actuator must be installed per standard practices outlined in the instruction manual. The environment must be checked to verify that environmental conditions do not exceed the ratings. The 785C actuator must be accessible for physical inspection.

  • Page 7: Operation And Maintenance

    Remove the bypass and restore normal operation. Repair and replacement Repair and replacement procedures in the instruction manuals must be followed. Manufacturer Notification Any failures that are detected and that compromise functional safety should be reported to Emerson. Please contact your Emerson sales office.
  • Page 8 Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user. Fisher is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson Automation Solutions, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co.

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