Part Code Definition

A6120 is fixed standard part number of dual-channel absolute vibration monitor under AMS6500 series, no suffix variant; paired relative vibration card is A6110 (eddy current shaft vibration), cannot cross replacement.

Technical Specifications

Backplane power: +24VDC from AMS6500 rack backplane, max power consumption 6W

Channel layout: 2 independent isolated differential input channels for electrodynamic seismic sensors

Frequency response: 10Hz~1000Hz (velocity measurement standard band)

Input signal range: AC -5VDC ~ +15VDC dynamic signal, min input 311mVpp, max 9500mVpp

Measurement precision: full scale accuracy ≤±1%FS, output standard 4~20mA analog signal

Ambient condition: operating 0℃~+60℃, storage -40℃~+85℃, humidity 5%~95%RH non-condensing

Dimension & Weight: 130×185×65mm, net weight approx 0.52kg, 3U single slot rack installation

Load capacity: analog output max load resistance＜500Ω

Interface & Communication Layout

Front panel: two sensor input BNC terminals for connecting 9266/9267/9268 seismic velocity sensors; LED indicators for POWER, RUN, ALARM, TRIP status display

Rear golden finger: AMS6500 proprietary backplane bus, realize real-time data upload to rack main controller and DCS system

Terminal side: 4~20mA analog output terminal for connecting DCS AI module; relay dry contact for vibration over-limit trip output

Core Functions

Collect absolute vibration velocity of rotating equipment bearing housing, convert raw sensor alternating signal into standard 4–20mA industrial analog signal to Ovation/DeltaV DCS system

Built-in configurable alarm & trip threshold: independent high-alarm and dangerous trip value for each channel, abnormal vibration triggers relay switch output for equipment interlock protection

Full self-diagnosis: detect sensor open/short circuit, module power failure, channel fault automatically, fault message uploaded to AMS6500 monitoring host log

Continuous real-time vibration trending data storage, support equipment unbalance, bearing looseness, casing resonance early fault prediction maintenance

Application Scenarios

Steam turbine/ gas turbine casing vibration monitoring in thermal power plant; large blower, induced draft fan bearing housing vibration protection; petrochemical reciprocating compressor, centrifugal pump mechanical safety monitoring; AMS6500 system spare module replacement for coal chemical unit

Operation & Maintenance Notes

Only install into designated AMS6500 empty slot, confirm rack bus specification before plugging to avoid backplane burnout

Seismic sensor shielded wire separate from high-power AC cable during wiring to avoid electromagnetic interference causing measurement drift

Complete alarm/trip parameter setting via AMS6500 upper computer software after power-on commissioning

Online module replacement allowed after rack power keeps normal, matched seismic sensors must be EPRO original 926X series to guarantee measuring precision