Universal trip amplifier 4179B

Functional highlights

• The 0... 5 AAC RMS range makes it possible to accurately measure a typical current transformer.
• The 0...300 VAC RMS range allows accurate supply voltage monitoring.
• The device measures standard input ranges and can be freely configured to customer-defined input range.
• Process control with 2 pairs of potential-free relay contacts which can be configured to suit any application.
• Trip amplifier with window function allowing the relay to change state within a high and a low setpoint on the input span.
• Simulation of process value during commissioning / maintenance.
• All terminals are over-voltage protected, polarity protected and short-circuit protected.
• The 4179B provides the required failure data (SFF and PFD_AVG) for SIL 2 applications as per IEC 61508 / IEC 61511.
• Failure rates for 4179B correspond to Performance Level “d” according to ISO-13849.

Technical characteristics

• Accuracy < 0.3% of span.
• Temperature coefficient 0.01% / °C.
• Response time < 0.75 s for measuring AC current / voltage signals.
• High galvanic isolation of 2.3 kVAC.
• Extended EMC immunity: NAMUR NE21, A criterion, burst.
• Functional safety: HW assessment, SFF > 90%.

Programming

• Configuration, monitoring and diagnostics using PR 4500 detachable communication interfaces. Product-specific functionality includes communication via Modbus and Bluetooth using our PR Process Supervisor (PPS) application, available for iOS and Android.
• All programming can be password protected.
• Scrolling help text in 7 languages.