User Manual

18of30 MN890570 RevA
WIRING StepEight
WireConnections:

Red&Black:RedandBlackleadsareforconnectiontoa12‐28VDCpowersupplyortoa4‐20mAlooppower
source(SeriesULSS,ULSM&ULSLonly).Theredandblackwirescanbeextendedupto1,000feetusinga22
gaugeorlargerwire,howeverdonotextendthegreenandwhitewires.
White & Green:White and Green leads arereserved for use with ULSX‐CAL and should not be connected
duringusage in the application.These wires should not beconnectedtoULSX‐CAL while power issupplied
fromanysourceotherthantheULS‐ACC‐USBFob.Themaximumcabledistancebetweenthecomputerand
SeriesULSis15’.
Neverallowthewhiteorgreenwirestotouchanypowersupply.
Blue,Orange,Yellow,Purple&Brown:Blue,Orange,Yellow&Purplewiresaretherelaycontacts(normally
open)fromeachoftherelays respectively.TheBrownwireisthecommonforalltherelays.Relayselectionis
determinedbytheconfigu r ationinULSX‐CAL.Note:SeriesULSuseslatchingrelays.Whenpowerisremovedto
the sensor, the relays will remain in their last state.Ex: If the relay is energized, when power is removed, the
relaywillremaininanenergizedst at e. 
Generalnotesforelectricalconnections,usageandsafety:
 Wherepersonalsafetyorsignificantpropertydamagecanoccurduetoaspill,theinstallationmust
havearedundantbackupsafetysysteminstalled.
 Wiringshouldalways
becompletedbyalicensedelectrician.
 Supplyvoltageshouldneverexceed28VDC.
 Alwaysusestepperrelaysbetweenthesensorandexternalloads.ForDCcircuitsuseacatchdiode
suchas1N4148,shownonpreviouspage.
 Protectthesensorfromexcessiveelectricalspikesbyisolatingthepower,wheneverpossible.
 Thesensormaterialsmustbechemicallycompatiblewiththeliquidstobemeasured.
 Designafail‐safesystemforpossiblesensorand/orpowerfailure.
 NeverusethesensorinenvironmentsclassifiedasHazardous.
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