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FW Murphy EVS-2 Series Electronic Vibration Switch
电子式振动开关 EVS-2 Electronic Vibration Switch
摩菲EVS-2电子式振动开关通过监测基于速度的振动水平并在检测到异常振动时提供早期警告或关闭来防止设备故障。EVS-2可以连接到Murphy的TTD 信号器、Centurion 或Centurion PLUS 控制器，以增加功能。它补充了Murphy的VS2冲击和过度振动/脉动开关，旨在检测异常。由于设备故障引起的冲击或脉动，以及关闭系统中的其他设备以防止进一步损坏。EVS-2提供两个可调液位检测器，可定义报警或停机警报的响应延迟。液位检测器的测量范围和响应时间由DIP开关设置。指定的继电器为警告或供电停机警报。美国摩菲Murphy公司是专业的振动开关产品生产厂家，在行业内拥有70多年经验。多年来，摩菲公司生产的振动开关产品以其高可靠性和误报率，受到了包括SPX、GEA、IHW、Howden、Hamon、Bechtel、龙源冷却、江苏双良等国内外用户的好评。作为摩菲公司在国内的代理，信德迈科技(北京)有限公司将竭诚为您服务！
Murphy EVS-2 Electronic Vibration Switch
EVS-2 Electronic Vibration Switch
The 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 or Centurion PLUS controllers for increased functionality. It complements Murphy’s VS2 shock and excessive vibration/pulsation switch designed to detect abnormal
shock or pulsation due to equipment failure and to shutdown other equipment in a system to prevent further damage.
The EVS-2 offers two adjustable level detectors with definable response delay for either Warning or Shutdown alarms. Measuring ranges and response times of the level detectors are set by DIP switch. The assigned relay powers a warning or
shutdown alarm.
A single model provides all the features and benefits described in the bulletin. Order EVS-2 (PN: 20-70-0242).
EVS电子振动开关特性：
 具有通用安装底板和螺栓,可直接替换机械振动开关
4-20mA信号输出
继电器或可控硅开关的两极报警
环境防护等级：NEMA 4X， IP65
防爆认证： CSA， ATEX， CE
温度范围：-40℃～+85℃
安装都非常简单 安装后无需维护
EVS电子振动开关应用：
泵
电动机
工业风扇
热交换器/冷却塔
发动机
往复式压缩机
离心分离机
碎石机或磨煤机
 
- The Murphy EVS Model EX Electronic Vibration Switch Installation and Operations Manual
- EVS-2 Electronic Vibration Switch EVS-2 Electronic Vibration Switch
- The Murphy EVS Electronic Vibration Switch Installation and Operations Manual
- Electronic Vibration Switch (EVS)
EVS电子振动开技术指标:
Murphy EVS-SB – Internal Battery Power
. Battery power provided via 7.2V V lithium-Ion cell(s)
. Open circuit maximum voltage of 10VDC.
. Batter Life – 1 year under normal operation
. Normal operation 10v> Vbat> 6.4v
. Low battery mode: 5.0v< Vbat< 6.4v
. System shutdown and alarm mode active below 5.0v
Murphy EVS-A, EVS-S – External DC Power
. External power: 8-32 VDC
. Input Current: 100mA Max
Product Accuracy
. ±5% of full scale at 1.5 ips and 21 deg C.
. ±5% Variation over temperature from 21 deg C, over
operating range..
. Integration Stage End-to-End Noise: <0.01 ips RMS
Murphy EVS-S and EVS-A
. ±5%, at Bandwidth of 6 to 500 Hz from 50Hz calibration
point
. ±3dB at Bandwidth of 3 to 875 Hz, worst case
Murphy EVS-SB
. ±5%, at Bandwidth of 6 to 350 Hz from 50Hz calibration
point
. ±3dB at Bandwidth of 3 to 875 Hz, worst case
Trigger Feature
. Trigger level between 0.1 and 1.5 inches per second (ips)
Peak
. Trigger set with single turn adjustable PC board mount
potentiometer
. PC board marked with 15 marks corresponding to 0.1 to 1.5
in 0.1 increments
Time Delay Feature
. Adjustable from 0 to 10 seconds
. Set with adjustable single turn PC board mount
potentiometer
. PC board marked with 11 marks corresponding to 0 to 10
seconds in 1 second intervals
Output
. Normally-Open and Normally-Closed outputs simultaneously
available
. Open-collector outputs sink to Common Ground
. 50 mA sink capacity
. Input voltage: 40 VDC maximum
. Switch output is selectable for latched or non-latch
configurations. Reset accomplished by reset pushbutton or
external contact closure when in latch mode.
. Shutdown Alarm activated on power loss
LED Outputs
Alarm LED output
. Red LED
. LED strobing for first 5 minutes after entering Alarm mode
. Flashing thereafter until Reset activated
. Strobe rate: 2mSec on, every 0.5 ±0.25 seconds
. Flash rate: 2mSec on, every 6 ±1 seconds
Power LED output
.. Green LED
. Flash Duration: 2mSec
Murphy EVS-S and EVS-A
. Flash once every 6 ±1 seconds
Murphy EVS-SB
. Battery status “Normal”: Flash once every 6 ±1 seconds
Battery in “Low-Battery” range: Flash once every 12±1
seconds
4-20mA output (EVS-A only)
. Power obtained from power supply
. Loop Resistance: 600 ohms max at 24 V and 20mA.
. Current loop accuracy ±5% from internal setpoint
. 20 ma corresponds to 1.5 ips Peak
. 4 ma corresponds to 0 ips Peak
Reset
. Local reset switch w/momentary contact
. External reset: Available via header and will require an
external relay or pushbutton contact to ground to activate the
reset.
. Activation Period: Reset must be active for 0.5 sec.
minimum to reset the switch.
Circuit Functional blocks
. Charge Amp interface
- The input Transducer is an integrated PZT element for
measuring acceleration with an internal charge converter.
- Maximum G level of 13 g’s at 500hz
.. Bandpass Filter
- Frequency response dependent on model number (refer to
“Product Accuracy”)
.. Integration
- Integration to convert from G to IPS peak
Approvals
. Hazardous Area approvals applied for. (refer to “Product
Table”)
美国摩菲Murphy振动开关国内客户列表：
美国SPX（斯必克）冷却技术公司
德国基伊埃（GEA）
德国基伊埃电力冷却技术(中国)有限公司
豪顿华工程有限公司Howden
荏原机械（中国）有限公司Ebara
北京龙源冷却技术有限公司
北京首航艾启威节能技术股份有限公司IHW
首航波纹管制造有限公司
首航艾启威冷却技术(北京)有限公司
瑞士艾启威（IHW）联合设计集团
江苏双良空调设备股份有限公司
哈尔滨空调设备股份有限公司
保定惠阳航空螺旋桨制造厂
石家庄红叶风机有限公司
上海神风制冷设备有限公司
陕西四达散热器有限公司
江苏中联风能机械有限公司
浙江明新风机有限公司
山西捷益热能设备有限公司
山西申华电站设备有限公司、
（兰州石油机械研究所）甘肃蓝科石化设备有限责任公司
四川川空换热器有限公司、
山西科工龙盛科技有限公司
内蒙古的金岛重工有限公司
中国航天科工集团第六研究院国营红岗机械厂
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