Murphy EVS-S Environmental, Power Requirements, Product Accuracy, Trigger Feature, Output, Reset

Specifications

Environmental

ƒOperating Temperature:-40°F to 185°F (-40°C and +85°C).

ƒHumidity: 0-95% non-condensing

ƒVibration: 30 g’s (Mechanical stability)

Power Requirements

Murphy EVS-SB – Internal Battery Power

ƒBattery power provided via 7.2V V lithium-Ion cell(s)

ƒOpen circuit maximum voltage of 10VDC.

ƒBatter Life – 1 year under normal operation

ƒNormal operation 10v> Vbat> 6.4v

ƒLow battery mode: 5.0v< Vbat< 6.4v

ƒSystem shutdown and alarm mode active below 5.0v

Murphy EVS-A, EVS-S – External DC Power

ƒExternal power: 8-32 VDC

ƒInput Current: 100mA Max

Product Accuracy

ı5% of full scale at 1.5 ips and 21 deg C.

ı5% Variation over temperature from 21 deg C, over operating range..

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

Murphy EVS-S and EVS-A

ı5%, at Bandwidth of 6 to 500 Hz from 50Hz calibration point

ı3dB at Bandwidth of 3 to 875 Hz, worst case

Murphy EVS-SB

ı5%, at Bandwidth of 6 to 350 Hz from 50Hz calibration point

ı3dB at Bandwidth of 3 to 875 Hz, worst case

Trigger Feature

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

ƒTrigger set with single turn adjustable PC board mount potentiometer

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

Time Delay Feature

ƒAdjustable from 0 to 10 seconds

ƒSet with adjustable single turn PC board mount potentiometer

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

Output

ƒNormally-Open and Normally-Closed outputs simultaneously available

ƒOpen-collector outputs sink to Common Ground

ƒ50 mA sink capacity

ƒInput voltage: 40 VDC maximum

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

ƒShutdown Alarm activated on power loss

LED Outputs

Alarm LED output

ƒRed LED

ƒLED strobing for first 5 minutes after entering Alarm mode

ƒFlashing thereafter until Reset activated

ƒStrobe rate: 2mSec on, every 0.5 ±0.25 seconds

ƒFlash rate: 2mSec on, every 6 ±1 seconds

Power LED output

ƒGreen LED

ƒFlash Duration: 2mSec

Murphy EVS-S and EVS-A

ƒFlash once every 6 ±1 seconds

Murphy EVS-SB

ƒBattery 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)

ƒPower obtained from power supply

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

ƒCurrent loop accuracy ±5% from internal setpoint

ƒ20 ma corresponds to 1.5 ips Peak

ƒ4 ma corresponds to 0 ips Peak

Reset

ƒLocal reset switch w/momentary contact

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

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

Circuit Functional blocks

ƒCharge 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

ƒBandpass Filter

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

ƒIntegration

-Integration to convert from G to IPS peak

Approvals

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

NMEA 4

Product Dimensions and Sensitivity Axis

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