Emerson EPRO MMS 3120/022-100 Dual Channel Bearing Vibration Transmitter

Configured for seismic vibration monitoring in industrial machinery, the Emerson EPRO MMS 3120/022-100 (MMS3120/022-100) Dual Channel Bearing Vibration Transmitter provides direct electrical conversion of electrodynamic velocity sensor signals into proportional current outputs.

Hardware Specifications

Process Control and DCS Connectivity

The MMS3120/022-100 facilitates seamless integration with DCS platforms through standardized 0/4-20 mA current loops. The module features channel-to-channel isolation to maintain signal integrity during concurrent monitoring of vibration velocity and peak-to-peak amplitude. Each loop is referenced to the system ground, ensuring deterministic data transmission across the process control network. The transmitter architecture incorporates integrated self-check diagnostics, providing continuous status monitoring for both the connected electrodynamic sensors and internal signal conditioning circuitry to ensure loop availability.

Frequently Asked Questions

Q: How do the redundant 24 VDC supply inputs function during a power supply fault?

A: The transmitter is equipped with dual redundant power inputs. The internal circuitry is designed to draw power from either source, ensuring that the measurement loop remains energized and operational even if one supply line experiences a failure or disconnects.

Q: Can the frequency response be adjusted for different machinery types?

A: Yes. The module features selectable high-pass filtering (5/10/15 Hz) and adjustable low-pass filtering (50 to 1500 Hz), allowing the unit to be tuned to the specific rotational speeds and mechanical characteristics of the monitored asset, such as fans, compressors, or pumps.

Field Installation Guidelines

1. Mount the transmitter enclosure directly at the machine housing, ensuring that the mounting surface is clean and provides a stable reference for seismic vibration sensing.
2. Connect the electrodynamic sensors to the two independent input channels, ensuring that cable shielding is properly terminated at the system ground to prevent electromagnetic noise in the velocity signal path.
3. Verify that the 24 VDC power supply lines are connected to both redundant inputs to take advantage of the power availability features.
4. Set the high-pass and low-pass filter switches according to the machine's operational frequency spectrum during the commissioning phase.
5. Confirm the 4-20 mA output loop current is within specification by monitoring the signal at the DCS termination point before placing the machinery into active service.