Provides two independent differential transducer channels for casing vibration monitoring.
Product Overview
A6120 is a two-channel case seismic vibration monitor for the AMS 6500 classic machinery protection system. It measures bearing-case velocity from compatible electro-dynamic sensors and compares the result with alarm setpoints.
A6120 occupies one 3U rack slot and is used in protection systems for steam and gas turbines, compressors, hydro machines and other critical equipment.
Performance
Supports overall velocity measurement in mm/s or in/s with adjustable frequency conditioning.
Offers front and rear buffered outputs, 0/4-20 mA proportional outputs and 0-10 V outputs.
Supports remote limit multiply and trip bypass within the configured protection strategy.
Technical Details
| Manufacturer | Emerson |
|---|---|
| System | AMS 6500 classic machinery protection |
| Measurement | Case seismic vibration velocity |
| Input channels | 2 independent differential channels |
| Compatible Emerson sensors | 9266, 9267 or 9268 electro-dynamic sensors |
| Input resistance | Greater than 100 kohms |
| Input voltage range | -5 to +15 VDC |
| Frequency range | Lower cutoff 1 or 5 Hz; upper cutoff adjustable 50-2000 Hz |
| Analog outputs | 0/4-20 mA and 0-10 V plus buffered outputs |
| Form factor | 3U, one slot, 30 mm wide |
| Rack capacity | Up to 14 modules in a 19-inch rack |
| Power consumption | 6 W maximum; 250 mA at 24 VDC |
| Operating temperature | 0 to 65 degrees C |
| Storage temperature | -30 to +85 degrees C |
| Relative humidity | 5-95%, non-condensing |
| Protection | IP00 module; IP21 front plate |
| Service feature | API 670 compliant and hot swappable |
System Integration
- Confirm the installed sensor type, sensitivity, polarity and channel frequency range before moving a protection channel.
- Back up channel scaling, alert and danger setpoints, delays, relay voting and proportional-output assignments.
- Place the affected trips in the authorized bypass state before using the hot-swap feature.
- After insertion, compare buffered signal, overall value and alarm behavior with an independent vibration reference.
Applications
- Bearing-case velocity protection on steam turbines, gas turbines and compressors.
- Hydro and nuclear rotating machinery using electro-dynamic seismic transducers.
- Retrofit paths retaining 9266, 9267 or 9268 sensors while renewing the monitoring card.
FAQ
Can A6120 be used with a piezoelectric velocity sensor?
The documented monitor is designed for electro-dynamic sensors. Any alternate sensor path requires a complete compatibility review of power, sensitivity, bias and frequency response.
What data should be exported before replacing A6120?
Save channel range, sensor sensitivity, filter settings, setpoints, delays, trip logic, relay voting and analog-output scaling.
How should A6120 be proved after a hot swap?
Verify card diagnostics, sensor signal, buffered waveform, overall velocity, analog outputs and alarm relays before removing bypass.
What can cause an A6120 channel to read incorrectly even when the card is healthy?
Sensor polarity, open wiring, poor shielding, changed mounting stiffness and incorrect sensitivity or filter configuration can all affect the reading.
What spare information should be stored with A6120?
Keep the rack slot, module revision, channel configuration, sensor identities and latest loop-test record together.
About IndustryParts
https://www.industryparts.com/Protection logic is part of the spare record
IndustryParts prepares A6120 supply with the sensor, rack-slot and alarm-configuration evidence needed for a controlled return to service.
- Sensor path identified
- Setpoints retained
- Bypass plan reviewed
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