Isolator uses switching repeater and digital output modules.

Press Release Summary:

Complementing ISpac Isolator System, Type 9170 Switching Repeater and Type 9175 Digital Output modules provide safety while transferring intrinsically safe binary signals. Available in 1- or 2-channel versions, Model 9170/x0-14-12 emulates Namur signal at control system output, while Model 9175/10-1x-12 detects short circuits and wire breaks in field. Units ensure consistent error monitoring of every channel from field to control level despite isolator in between.

Original Press Release:

R. Stahl Extends Its ISPAC Isolator System

Uninterrupted monitoring of binary Ex i signals in applications using isolators

HOUSTON - New versions of the type 9170 switching repeater and the type 9175 digital output provide increased safety while transferring intrinsically safe binary signals: for the first time, they ensure complete, consistent error monitoring of every channel from the field to the control level despite an isolator in between. The new modules, which complement R. STAHL's ISpac model range, allow users to detect cable errors between isolator and process control units and also to identify interferences in the field which are then reported to the control system via signal channel. Applications with safety-oriented signals according to IEC EN 61508 / 61511 - e.g. emergency stops using magnetic valves - will benefit from the reliable monitoring of the complete circuit. Safety is increased for the plant, operating staff and the time spent on error detection is minimized. Therefore, the new modules are suitable for Ex i signals in zones 0 and 1 and, at the same time, for use in SIL 2-compliant signal circuits.

The 9170/x0-14-12 type switching repeater, which is available as a one- or two-channel version, emulates a Namur signal at its control system output. This allows users to distinguish between OFF signals and wire breaks on one side and ON signals and short circuits on the other side. The output features an additional Normally Closed Contact (NCC) which opens in case of an error in the field, thereby reporting the detected cable error to the control system. An analysis of a separate error detection contact, which was required up to now, is no longer necessary. The model 9175/10-1x-12 digital output device detects short circuits and wire breaks in the field. The standard models were already capable of reporting detected errors via separate contacts. The new models can now emulate errors detected in the field via an integrated contact in the isolator input for the digital control system output. The control unit's error detection system can then directly identify the problem and display it for the user.

Company Background

For more than 80 years, R. STAHL has been a trendsetting manufacturer of safety technology for hazardous areas. The company is one of the world's leading suppliers of explosion-protected automation, control and distribution, installation, operating and monitoring, lighting, signaling and alarm components and systems. Key products include customer-specific systems solutions for hazardous areas. R. STAHL's individual packages containing tailored product combinations and a wide range of services such as consulting, project planning, engineering and training courses for customers are designed to fully meet application requirements and customer needs. International certifications, approvals and patents demonstrate the company's expertise and allow for R. STAHL's products to be used throughout the world.

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