Specifications

Section 20 00-02-0841
2013-01-14 - 1 -
Product Information
Murphy EVS-2 Overview
The Murphy Electronic Vibration Switch (EVS-2) protects against equipment failure by
monitoring velocity-based vibration levels and providing an early warning or shutdown when
abnormal vibration is detected. The EVS-2 can be connected to Murphy’s TTD annunciator,
Centurion , Centurion PLUS or any third- party controller that accepts a switch input or 4-
20mA signal for increased functionality.
NOTE: The Murphy EVS-2 complements Murphy’s VS2 shock and
excessive vibration switch, which is designed to detect an abnormal shock
due to equipment failure and to shutdown other equipment in a system to
prevent further damage.
Features
 Universal use, can be mounted horizontal, vertical or at any other angle
 Piezoelectric-crystal internal sensor with built-in microelectronics for reduced noise
sensitivity
 Electronically integrated output signal that measures and trips on velocity (IPS peak)
 Two independently adjustable output channels
 Shutdown setpoint measured in velocity (IPS peak)
 4-20 mA output for continuous monitoring capability
 Solid-state outputs for setpoint trip
 Adjustable time delay to prevent false tripping on high-vibration start-ups or non-
repetitive transient events
 RAW 100mV/g output also available
Applications
The Murphy EVS-2 can be used on any
equipment where abnormal vibration could
lead to equipment damage, including:
Cooling fans
Engines
Pumps
Compressors
Gear boxes
Motors
Generator sets
The Murphy EVS-2 can monitor and alert the
operator of abnormal vibration caused by a
variety of possible factors, including:
Imbalance
Misalignments
Worn sleeve bearings
Broken tie down bolts
Worn ball or roller bearings
Gear mesh
Blade pass frequencies
Detonation
Broken parts