05062
05-05-06
Section 20
Electronic Vibration Switch (EVS)
Features
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Piezoelectric-crystal internal sensor with
built-in microelectronics for reduced noise
sensitivity
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Electronically integrated output signal that
measures and trips on velocity
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•
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Adjustable calibrated set-point controls
Shutdown set-point measured in velocity
Optional 4-20 mA output for continuous
monitoring capability
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Solid-state outputs for setpoint trip
Adjustable time delay to prevent false
tripping on high-vibration start-ups or non-
repetitive transient events
Also available, optional internal battery powered
EVS switch model, designed for use on
ignition powered systems.
•
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:
The EVS product can monitor and alert the
operator of abnormal vibration caused by a
variety of possible factors, including:
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•
•
•
•
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Cooling fans
Engines
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•
•
•
•
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Imbalance and misalignments
Defective sleeve bearings
Broken tie down bolts
Defective ball or roller bearings
Gear mesh
Pumps
Compressors
Gear boxes
Motors
Blade pass frequencies
Detonation
Generator sets
Broken parts
EVS Product Table
Model
EVS-S
Power
24 VDC
Bandwidth
6-500Hz
6-500Hz
6-350Hz
6-500Hz
6-500Hz
Analog Out
Area Classification*
CL I, Gr C,D, Div 2
CL I, Gr C,D, Div 2
CL I, Gr C,D, Div 2
CL I, Gr C,D, Div 1
CL I, Gr C,D, Div 1
No
Yes
No
EVS-A
24 VDC
Internal Battery
24 VDC
EVS-SB
EVS-S-EX
EVS-A-EX
No
24 VDC
Yes
*Submitted for approval
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.
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