Emerson A6370D high-integrity overspeed safety monitor for AMS 6300 SIS system, supports VR, Hall-effect and eddy current sensors, SIL3 compliant overspeed protection for steam turbines, gas turbines and centrifugal compressors.

Product Overview

• Part No: A6370D
• Brand: EMERSON / EPRO

• Category: Overspeed Protection Monitor Module A6370D is a safety-certified overspeed monitor serving as the core component of Emerson AMS 6300 SIS safety instrumented system. It receives pulse signals from variable reluctance (VR), Hall-effect or eddy-current speed probes to continuously measure rotating shaft speed. The module executes high-speed signal processing and compares measured rotational speed against user-defined alert and trip setpoints. When overspeed conditions are detected, it triggers safety relay outputs to initiate emergency shutdown and avoid catastrophic machinery failure. It supports 2oo3 voting architecture to achieve SIL3 safety integrity level. Equipped with multiple communication interfaces for parameter configuration and real-time speed data transmission to DCS systems. Front panel LED indicators display power status, sensor faults, alarm and trip conditions for straightforward on-site diagnosis. The module works with A6371 backplane and serves as critical maintenance spare for power plants, oil & gas and petrochemical turbomachinery safety protection systems.

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Core Features

• Accepts input signals from VR, Hall-effect and eddy-current speed sensors
• High-precision rotational speed measurement with fast trip response
• Supports redundant sensor input and configurable overspeed alarm & trip thresholds
• Compliant with SIL2/SIL3 safety requirements, applicable for turbine safety protection
• Multiple output options: 0/4–20mA analog signals and safety relay trip outputs
• Onboard USB, RS485 Modbus RTU; optional PROFIBUS-DP communication
• Comprehensive self-diagnosis covering sensor open-circuit, short-circuit and module hardware faults
• Front panel LED indicators for power, sensor status, alert and overspeed trip
• Designed for 19-inch 3U rack installation with A6371 backplane assembly

• Rugged industrial hardware meeting strict EMC and vibration standards for continuous 24/7 operation

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Technical Specifications

• Sensor Input: VR sensor, Hall-effect sensor, eddy current probe
• Frequency Range: 0–20 kHz
• Rotational Speed Measuring Range: 0–30000 RPM (software configurable)
• Measurement Accuracy: ±0.5% of full scale
• Trip Response Time: ≤12.5 ms
• Power Supply: 24 VDC ±10%
• Analog Output: 0/4–20mA DC
• Safety Certification: SIL 2 / SIL 3 capable
• Operating Temperature: -20°C ~ +65°C
• Storage Temperature: -40°C ~ +85°C
• Form Factor: 3RU/42HP for 19-inch rack, matched with A6371 backplane

• Protection Class: IP20 when installed inside control cabinet

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Compatibility & Application

• Matches Emerson AMS 6300 SIS system and A6371 backplane
• Compatible with standard speed probes for rotating machinery
• Widely deployed in thermal power plants, combined-cycle power stations, oil & gas and petrochemical industries
• Applied for overspeed safety protection of steam turbines, gas turbines, generators and large centrifugal compressors