Emerson EPRO MMA3311/022-100 Key Monitor

Product Description

The MMA3311/022-100 is a high-precision, wall-mounted speed and phase (key) monitoring module designed for small-to-medium-scale rotating machinery. It interfaces with eddy-current sensors to measure rotational speed and generate critical "Key" signals for phase-locked vibration analysis. This rugged IP65 unit is ideal for monitoring turbines, compressors, and pumps, providing both analog outputs and relay contacts for direct machine protection.

Technical Specifications

• Model Number: MMA3311/022-100

• Brand: Emerson / Epro

• Sensor Input: Eddy-Current Sensors

• Measurement Range: Up to 65,535 RPM (software configurable)

• Frequency Range: 0 to 20 kHz (with automatic trigger level setting)

• Output Signals:

• Analog: 0/4 to 20 mA or 20 to 4/0 mA (Field selectable)

• Buffered Out: 2.0 to 10.0 VDC (2x connections)

• Relays: 5x Make Contacts (Max 48 VDC / 1 A / 50 W)

• Accuracy: 0.25% Linearity Error at 25°C

• Power Supply: Nominal +24 VDC (Max 6 W)

• Environmental Rating: IP65 (Dust-tight and water-resistant)

• Operating Temperature: -20°C to 65°C (-4°F to 149°F)

• Housing: Non-corroding Aluminum / Wall Mount

• Country of Origin: Germany

Key Engineering Features

• Phase Reference Generation: Acts as a Tachometer/Key Phaser for vibration monitoring systems, allowing engineers to correlate vibration data with specific shaft positions.

• Dynamic Triggering: Features automatic trigger level setting within a 0 to 20 kHz range, ensuring reliable pulse detection across varying shaft speeds and sensor gaps.

• Field Configurable Logic: All measurement settings, alarm setpoints, and output scaling are freely selectable via configuration software for maximum application flexibility.

• Stand-Alone Protection: Equipped with five integrated relays, the module can trigger "Alert" or "Danger" shutdowns independently of a primary PLC or DCS.

• High-Resilience Design: With a 20 g peak shock limit and non-corroding aluminum housing, it is built for the vibration-heavy and wash-down environments of industrial facilities.