937T Isolator Barriers

Our 937T Isolator Barriers include galvanic optical or transformer isolation, these modules provide an interface within the intrinsic safety circuit that is electrically separated from the control system. A key advantage of isolated barriers is that they do not require a ground between the module and the intrinsically safe device. Available in 12.5 mm (0.5 in) and 20mm (0.8 in) widths.

Bulletin 937T Isolator Barriers
  • Overview
  • What's New
  • Product Selection
  • Specifications
  • Documentation
  • Resources
  • Applications

Features

  • Uses integrated diagnostics for simple maintenance and quick change of modules during ongoing operation
  • Uses DIP switches or Field Device Tool software for easy configuration
  • Provides easy and reliable planning and documentation with comprehensive standards compliance up to SIL 3
  • Offers horizontal or vertical mounting with no reduction in operational ratings
  • Includes line fault detection for field circuits
  • Provides power rail for reduced wiring, collective error messaging, and efficient troubleshooting and installation

Additional Information

Learn the basics of intrinsic safety circuits and how our Bulletin 937 Intrinsic Safety Modules can provide a cost-effective solution for hazardous location challenges.

Our Intrinsic Safety Modules Can Provide Cost-effective Solutions for Hazardous Location Challenges

Learn the basics of intrinsic safety circuits and how our Bulletin 937 Intrinsic Safety Modules can provide a cost-effective solution for hazardous location challenges.

  • The power rail feature can significantly reduce panel wiring
  • Intrinsic safety relates to other hazardous location protection such as containment or segregation
  • Intrinsic safety circuits work through energy limitation
  • Signal conversion modules can address interface challenges between field devices and available controller IO
  • Isolation modules can overcome ground loops that otherwise result in inaccurate IO signal readings

To view commonly ordered and quickly available products, use the Product Configuration Assistant for our complete product offerings.

Specifications

TitleNumberDownload
Bulletin 937 Intrinsic Safety Modules Selection Guide and Technical Data937-SG001

Certifications

You can see a list of certifications for the Bulletin 937T Isolator Barriers by product number and link to the pdf of the certification document.

Product Certifications

See our Product Certification site for Declarations of Conformity, certificates and other certification details.

Documentation

TitleNumberDownload
Bulletin 937 Intrinsic Safety Modules Product Profile937-PP001
Bulletin 937 Intrinsic Safety Modules Selection Guide and Technical Data937-SG001
Bulletin 937T Isolator Barriers Certification Information937T-TD001
Bulletin 937TH Hazardous Location Switch Amplifiers with Safeguarding Devices Wiring Diagram937TH-WD001
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Configuration & Selection Tools

  • CrossWorks — Convert competitive catalog numbers to similar Allen-Bradley® products.
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Other Resources

  • Procurement Specifications — Visit our online resource to find the procurement specifications for this product.
  • Knowledgebase — Visit our online resource for technical information, support chat and forums, software updates, and product safety advisories/notices.


Applications

Zener Barrier Intrinsic Safety Modules are used in any application with Class 1, Division 1 (Zones 0 and 1) hazardous locations such as:

  • Chemical
  • Petrochemical
  • Oil and Gas