Murphy EVS-A Folheto

 

Warranty - A limited warranty on materials and workmanship for one year is given with this FW Murphy product.  A copy of the 
warranty may be viewed or printed by going to www.fwmurphy.com/support/warranty.htm 

ƒ Operating 

Temperature:-40

°F to 185°F (-40°C and +85°C). 

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Humidity:  0-95% non-condensing 

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Vibration:  30 g’s (Mechanical stability) 

Murphy EVS-SB – Internal Battery Power 
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Battery power provided via 7.2V V lithium-Ion cell(s) 

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Open circuit maximum voltage of 10VDC. 

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Batter Life – 1 year under normal operation 

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Normal operation 10v> Vbat> 6.4v 

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Low battery mode:  5.0v< Vbat< 6.4v 

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System shutdown and alarm mode active below 5.0v 

Murphy EVS-A, EVS-S – External DC Power 
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External power:  8-32 VDC 

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Input Current:  100mA Max 

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±5% of full scale at 1.5 ips and 21 deg C. 

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±5% Variation over temperature from 21 deg C, over 
operating range.. 

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Integration Stage End-to-End Noise:  <0.01 ips RMS 

Murphy EVS-S and EVS-A 
ƒ 

±5%, at Bandwidth of 6 to 500 Hz from 50Hz calibration 
point 

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±3dB at Bandwidth of 3 to 875 Hz, worst case 

Murphy EVS-SB 
ƒ 

±5%, at Bandwidth of 6 to 350 Hz from 50Hz calibration 
point 

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±3dB at Bandwidth of 3 to 875 Hz, worst case 

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Trigger level between 0.1 and 1.5 inches per second (ips) 
Peak 

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Trigger set with single turn adjustable PC board mount 
potentiometer 

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PC board marked with 15 marks corresponding to 0.1 to 1.5 
in 0.1 increments 

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Adjustable from 0 to 10 seconds 

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Set with adjustable single turn PC board mount 
potentiometer 

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PC board marked with 11 marks corresponding to 0 to 10 
seconds in 1 second intervals 

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Normally-Open and Normally-Closed outputs simultaneously 
available 

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Open-collector outputs sink to Common Ground 

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50 mA sink capacity 

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Input voltage:  40 VDC maximum 

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Switch output is selectable for latched or non-latch 
configurations.  Reset accomplished by reset pushbutton or 
external contact closure when in latch mode. 

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Shutdown Alarm activated on power loss 

Alarm LED output 
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Red LED  

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LED strobing for first 5 minutes after entering Alarm mode 

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Flashing thereafter until Reset activated 

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Strobe rate:  2mSec on, every 0.5 

±0.25 seconds 

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Flash rate:  2mSec on, every 6 

±1 seconds 

Power LED output 
ƒ Green 

LED 

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Flash Duration:  2mSec 

Murphy EVS-S and EVS-A 
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Flash once every 6 

±1 seconds 

Murphy EVS-SB 
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Battery status “Normal”: Flash once every 6 

±1 seconds 

 

Battery in “Low-Battery” range:  Flash once every 12

±1 

seconds 

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Power obtained from power supply 

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Loop Resistance:  600 ohms max at 24 V and 20mA. 

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Current loop accuracy 

±5% from internal setpoint 

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20 ma corresponds to 1.5 ips Peak 

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4 ma corresponds to 0 ips Peak 

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Local reset switch w/momentary contact 

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External reset:  Available via header and will require an 
external relay or pushbutton contact to ground to activate the 
reset. 

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Activation Period:  Reset must be active for 0.5 sec. 
minimum to reset the switch. 

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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 

ƒ Bandpass 

Filter 

- Frequency response dependent on model number (refer to 
“Product Accuracy”) 

ƒ Integration 

- Integration to convert from G to IPS peak 

ƒ 

Hazardous Area approvals applied for.  (refer to “Product 
Table”) 

 NMEA 

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