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).