- Combine relative shaft and bearing motion only when both axes match
- Treat channel 1 and channel 2 as different sensor interfaces
- Verify phase, polarity and scale before trusting the combined value
EPRO MMS6140 measures absolute shaft vibration by combining relative shaft motion with absolute bearing motion from two different sensor principles.
Channel 1 uses an eddy-current chain and channel 2 uses a seismic or piezoelectric sensor; phase compensation and subtraction produce the combined absolute shaft signal.
Before replacement, document both sensor chains, phase and polarity conventions, filters, sensitivities, combination mode, alarms, outputs, relay logic, bypasses and rack configuration.
Availability, condition, price, and shipping time for MMS6140 are confirmed during quotation.
Emerson MMS6140 Manuals, Datasheets, Links
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
- Connect the eddy-current chain to the shaft channel
- Connect the seismic or piezoelectric sensor to the bearing channel
- Match both sensors to the same machine axis and location
- Preserve phase compensation and polarity
- Use compatible filter ranges and engineering units
- Check individual channels before evaluating the difference
- Prove each individual alarm path
- Validate the combined absolute-shaft output
- Restore relays and bypasses under controlled conditions
- Absolute shaft vibration protection on large turbines
- Combined rotor and bearing-motion monitoring on compressors
- Machinery diagnostics requiring relative-to-absolute vibration conversion