Murphy EVS-SB, EVS-S-EX, EVS-A specifications Section, Model Power Bandwidth, Area Classification

05062

05-05-06 Section 20

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:

The EVS product can monitor and alert the operator of abnormal vibration caused by a variety of possible factors, including:

•	Cooling fans			•	Imbalance and misalignments
•	Engines			•	Defective sleeve bearings
•	Pumps			•	Broken tie down bolts
•	Compressors			•	Defective ball or roller bearings
•	Gear boxes			•	Gear mesh
•	Motors			•	Blade pass frequencies
•	Generator sets			•	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

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.