Description
Product Description
Overview
The A6312/08 from Emerson is a high-precision, dual-channel eddy current speed sensor engineered for machinery protection and monitoring. Part of the AMS 6500 / Philips IS6000 system family, it enables accurate, non-contact measurement of shaft speed, phase reference, and rotation direction for turbines, compressors, pumps, and other rotating machinery. Its dual-channel design provides redundancy or multi-shaft monitoring, ensuring continuous protection in critical applications.
Key Features and Capabilities
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Detects rotational speeds from near zero up to high-speed turbine operation.
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Converts shaft motion into precise electrical signals compatible with the AMS 6500 system.
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Provides phase reference pulses (Keyphaser) for vibration monitoring and analysis.
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Dual independent channels allow simultaneous monitoring or fail-safe redundancy.
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Non-contact operation minimizes wear, extends service life, and reduces maintenance.
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Intrinsically safe operation possible in hazardous areas when paired with certified barriers.
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Complies with API 670 standards for machinery protection systems.
Technical Specifications
| Feature |
Specification |
| Model / Part Number |
A6312/08 |
| Sensor Type |
Dual-Channel Eddy Current / Proximity Sensor |
| Output Signal |
Voltage proportional to target distance; Pulse output for speed |
| Measuring Range |
Standard: 2.0 mm or 4.0 mm |
| Input Voltage |
-24 VDC (AMS 6500 Standard) |
| Operating Temperature |
Sensor Head: -35°C to +150°C |
| Housing Material |
Stainless Steel (Corrosion-Resistant) |
| Connection Options |
Integrated Cable or Plug-In Connector (Variant Dependent) |
| Target Material |
Ferromagnetic Steel (Standard) |
| Safety Compliance |
ATEX / IECEx Ready with Proper Barriers |
| Standards |
API 670 Machinery Protection Compliant |
| Applications |
Overspeed Detection, Phase Reference, Rotation Direction Monitoring |
Applications
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Overspeed Protection: Immediate turbine shutdown on exceeding speed limits.
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Phase Reference: Provides “once-per-revolution” pulses for condition monitoring systems.
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Rotation Direction: Dual sensors can determine forward or reverse rotation.
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Vibration Analysis: Compatible with Keyphaser-based vibration monitoring for critical rotating equipment.
FAQ
Q: Can the A6312/08 operate in extreme temperatures?
A: Yes, the sensor head is rated for -35°C to +150°C.
Q: How is zero-speed detection achieved?
A: The eddy current principle allows reliable sensing at near-zero RPM for precise startup and shutdown monitoring.
Q: What maintenance is required?
A: Non-contact measurement eliminates mechanical wear, requiring only periodic inspection of the sensor gap and cabling integrity.
Q: Can it be used with other AMS 6500 modules?
A: Yes, it integrates seamlessly with the AMS 6500 system and Philips IS6000 family protection cards.
