MMS 6220

Overview

MMS 6220 is an Emerson Epro dual-channel eccentricity monitor for precise measurement of shaft eccentricity in turbines and rotating machinery.

Sensor Inputs

• Channels: 2 independent eddy-current inputs

• Type: Differential, galvanically isolated

• Input impedance: ≥100 kΩ

• Voltage range: -1 to -23 V DC

• Frequency range: 0.017–70 Hz (1.02–4200 rpm)

• Signal range: 0–400 mV peak (min), 0–8000 mV peak (max)

Control Inputs

• Key pulse input: 1 pulse per revolution, 24 V logic

• Input resistance: ≥30 kΩ

• Pulse duration: Min. 10 µs, edge-triggered

• Voltage inputs: 2 channels, 0–10 V, 10-bit resolution

Power Supply

• Redundancy: Two decoupled inputs via diodes, at least one required

• Voltage: 18–31.2 V DC (IEC 654-2, class DC4)

• Power consumption: Max. 6 W (250 mA at 24 V)

• System capacity: Up to 31 modules / 62 channels per RS-485 bus

Dimensions & Weight

• Width: 30.0 mm (6 TE)

• Height: 128.4 mm (3 HE)

• Length: 160.0 mm

• Net weight: ~320 g

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