Meggitt vibro-meter VMS830-2 vibration monitor DESCRIPTION

DESCRIPTION

The VMS 830-2 vibration monitor from Meggitt’s

vibro-meter® product line is a dedicated vibration

monitor for use in vibration measurement chains.

The VMS 830-2 is a two-channel vibration monitor

that measures vibration displacement (PEAK)

and/or vibration velocity (RMS), using industrystandard velocity sensors.

Each VMS 830-2 measurement channel is

independently configurable to measure

displacement or velocity. Each channel provides

one 0 or 4 to 20 mA current loop output and a

buffered “Raw” voltage output signal. Further, for

each measurement, two alarms (Alert andDanger) and three relays (OK, Alert and Danger)

are supported. The alarms/relays are easily userconfigurable using potentiometers and DIP

switches. The VMS 830-2 also features LCD displays

to show measurement values.

During operation, the velocity sensor signal

(23 mV/mm/s) is converted by a preamplifier into

a standardized voltage signal (70.7 mV/mm/s). It

then passes through high-pass and low-pass filters

before being amplified by a two-step wide-band

amplifier to the level essential to the electronic

circuitry. It is user-configurable DIP switches that

determine which of the two possible

measurements/units – velocity or displacement –

is used for the vibration monitoring.

The DC-output signal (current loop output) is

available after true RMS rectification (RMS units).

The DC-output signal also acts with two

adjustable alarm level limit level detectors. The

response delay of the alarms/relays is set by DIL

switches to 1, 3, 5 or 10 seconds. The relays’

change-over contacts enable the Alert and

Danger circuits to operate as ether normally

energized (NE) or normally de-energized (NDE),

again, as set by DIL switches.

Accordingly, the VMS 830-2 vibration monitor is

recommended for the monitoring and protection

of stand-alone machines and auxiliary balance of

plant (BOP) equipment such as fans, pumps,

centrifuges, mills and gears. Among other things it

allows observation according to ISO 10816

(DIN 45665).

For evaluating the machine state, the VMS 830-2

vibration monitor provides velocity measurements

after machine-specific filtering and/or

displacement measurements (after additional

simple integration). Analog DC output signals

(current and voltage) corresponding to the

measured vibration are also provided.

Independently adjustable alarm level limits with

selectable response delay allow the

communication of Alert and Danger alarms via

appropriate assigned relays with dry contacts

(fail-safe-function).

For specific applications, contact your local

Meggitt representative.