Murphy Switch EVS S User Manual

05062  
05-05-06  
Section 20  
Electronic Vibration Switch (EVS)  
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  
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:  
Cooling fans  
Engines  
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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