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05062
05-05-06
Section 20
In order to consistently bring you the highest quality, full featured products, we reserve the right to change our specifications and designs at any time.
MURPHY, the Murphy logo, TTD
™
, Centurion
™
or Millennium
™
and VS2
™
are registered and/or common law trademarks of Murphy Industries, Inc. This
document, including textual matter and illustrations, is copyright protected by Murphy Industries, Inc., with all rights reserved. (c) 2006 Murphy Industries, Inc.
Electronic Vibration Switch (EVS)
Also available, optional internal battery powered
EVS switch model, designed for use on
ignition powered systems.
Features
• Piezoelectric-crystal internal sensor with
built-in microelectronics for reduced noise
sensitivity
• Electronically integrated output signal that
measures and trips on velocity
• Adjustable calibrated set-point controls
• Shutdown set-point measured in velocity
• Optional 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
• Self-test and calibration
The Electronic Vibration Switch (EVS)
protects against equipment failure by monitoring velocity-based vibration
levels and providing an early warning or shutdown when abnormal vibration is detected.
The EVS product can be connected to Murphy’s TTD
™
annunciator, Centurion
™
or Millennium
™
controllers for
increased functionality. It also complements Murphy’s VS2
™
shock and excessive vibration/pulsation switch, which
is designed to detect an abnormal shock or pulsation due to equipment failure and to shutdown other equipment in
a system to prevent further damage.
The EVS product 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 EVS product can monitor and alert the
operator of abnormal vibration caused by a
variety of possible factors, including:
• Imbalance and misalignments
• Defective sleeve bearings
• Broken tie down bolts
• Defective ball or roller bearings
• Gear mesh
• Blade pass frequencies
• Detonation
• Broken parts
EVS Product Table
Model Power Bandwidth Analog Out Area Classification*
EVS-S 24 VDC 6-500Hz No CL I, Gr C,D, Div 2
EVS-A 24 VDC 6-500Hz Yes CL I, Gr C,D, Div 2
EVS-SB Internal Battery 6-350Hz No CL I, Gr C,D, Div 2
EVS-S-EX 24 VDC 6-500Hz No CL I, Gr C,D, Div 1
EVS-A-EX 24 VDC 6-500Hz Yes CL I, Gr C,D, Div 1
*Submitted for approval