| January 17, 2013
Moore Industries: SIL 2-Rated Safety Relay Module
The SRM Safety Relay Module has been certified by exida for single use in Safety Instrumented Systems up to SIL 2.
The relay repeater module accepts single contact closure inputs from logic solver trip outputs including the company's STA Safety Trip Alarm and the SPA2 Programmable Limit Alarm Trip. With three contacts per alarm input, the unit allows for the addition of alarm contacts to safety processes without special installation or configuration. Unlike many other interposing relays, this is a Force Guided Relay, avoiding the possibility of having contacts become stuck in both Normally Open (NO) and Normally Closed (NC) positions at the same time and avoids potential problems caused by issues such as welded contacts. It uses a safety-related relay with forcibly-guided contacts, which are monitored and mechanically linked to the same armature as the output contacts. Developed following the IEC 61508 standard, it offers a high level of availability for safety-critical applications and for use as a component part of an SIS. It features a durable aluminum DIN case that can be mounted on either a 32 mm G-type or 35 mm top-hat DIN-rail, plus front-panel visual diagnostics, with three LED indicator lights reflecting the current Input, output and power status.
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