Description
Overview
The A6312‑8 Dual‑Channel Speed and Key Monitor is a high‑integrity measurement module designed for Emerson’s AMS 6500 machinery protection platform. It provides precise monitoring of shaft rotational speed, phase reference, zero‑speed conditions, and direction of rotation—critical parameters for safeguarding high‑value rotating equipment. This module supports API 670‑compliant protection architectures and integrates seamlessly with other AMS 6500 monitoring cards to form a complete machinery protection system.
Key Features
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Dual‑channel speed and phase (key) monitoring
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API 670‑compliant machinery protection functionality
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Supports redundant tachometer configuration with automatic switchover
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Monitors pulse quality, sensor gap voltage, and signal integrity
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Detects zero speed, reverse rotation, and phase angle
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Designed for turbines, compressors, and other high‑speed rotating assets
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Integrates with AMS 6500 for configuration, trending, and diagnostics
Technical Specifications
Electrical Characteristics
| Parameter |
Specification |
| Model Number |
A6312‑8 |
| Input Range |
0 to ±27.3 VDC |
| Output Capability |
Max. 6 W, 250 mA at 24 VDC |
| Channels |
Dual‑channel speed and key monitoring |
| Redundant Mode |
Supported; automatic switchover based on pulse comparison and gap voltage |
| Sensor Types |
Displacement probes for speed and phase measurement |
Environmental Ratings
| Parameter |
Specification |
| Operating Temperature |
Industrial‑rated range |
| Humidity |
5–95% RH, non‑condensing |
| Vibration |
Suitable for high‑vibration rotating machinery environments |
| Shock |
Industrial‑grade shock tolerance |
Mechanical Data
| Parameter |
Specification |
| Dimensions |
40.3 mm × 128.4 mm × 160.0 mm |
| Weight |
320 g |
| Mounting |
AMS 6500 rack system |
| Country of Origin |
USA |
Logistics
| Parameter |
Specification |
| Condition |
100% Brand New |
| Availability |
In Stock |
| MOQ |
1 |
| HS Code |
8537101190 |
Functional Description
The A6312‑8 module provides dual‑channel monitoring for both speed and key (phase) signals, enabling detailed assessment of shaft rotational behavior. Speed measurement is performed using a displacement probe aimed at a toothed wheel, gear, or keyway mounted on the shaft. This allows the system to detect zero‑speed conditions, reverse rotation, and real‑time speed changes for process control and protection.
Phase (key) measurement uses a once‑per‑revolution target to establish a reference point for vibration analysis, rotor position tracking, and advanced diagnostics. This parameter is essential for identifying changes in machine dynamics, such as rotor instability or developing mechanical faults.
In redundant mode, the module automatically switches between primary and backup tachometer sensors if signal degradation is detected. To maintain phase continuity, both sensors must be installed in the same axial plane.
The A6312‑8 is a core component of API 670‑compliant protection systems and is widely used in steam turbines, gas turbines, hydro units, and large compressors. Its robust design ensures long‑term reliability in harsh industrial environments.
Application Scenarios
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Speed and phase monitoring for high‑speed rotating machinery
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API 670‑compliant machinery protection systems
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Turbines, compressors, and hydro‑mechanical equipment
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Redundant tachometer installations requiring automatic failover
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Advanced diagnostics using AMS 6500 machinery health tools
FAQ
Q: Can the A6312‑8 operate in redundant tachometer mode? A: Yes. It supports automatic switchover based on pulse integrity and sensor gap voltage.
Q: What type of sensors are required for phase measurement? A: A once‑per‑revolution displacement probe is required for accurate phase reference.
Q: Is this module compatible with the AMS 6500 rack? A: Yes. It is designed specifically for AMS 6500 machinery protection systems.
