SIL-Certified Transmitter Suits Safety System Applications

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United Electric Controls has introduced the One Series safety transmitter, a SIL 2-certified transmitter designed solely for safety system applications. Unlike process transmitters that must be adapted for safety use, the One Series was engineered to protect.

The new One Series Safety Transmitter is available in versions that monitor temperature and pressure. Its features include a design that limits nuisance trips. It also includes an internal high-speed safety relay for quick emergency shutdown.

The One Series transmitter provides 4-20 mA NAMUR standard output with exclusive “I Am Working™” diagnostics. A high-speed safety relay output is incorporated for local alarm or emergency shutdown. Discrete outputs deliver diagnostics and relay status voting logic input to the safety PLC to determine appropriate action. The transmitter is certified for use in SIL 2 safety instrumented systems, and is capable of SIL 3 per IEC 61508. It has configurable self-diagnostics and achieves a safe failure fraction of 98.5 percent. Instrument response time is <100 milliseconds.

Additional features include a large digital display that provides process variable, status, self-diagnostics and field programming information, 100 percent programmable solid-state relay (switch set point and deadband) and worldwide hazardous location approvals for Class I, Divisions 1 & 2 (Zones 0, 1 & 2).

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