Flowline LU78 EchoSwitch Manual de usuario descargar pdf (Pagina 5)

RevA MN300282 5of34

SAFETYPRECAUTIONS(cont.) StepThree

MakeaFail‐SafeSystem:Designafail‐safesystemthataccommodatesthepossibilityofswitchand/orpower

failure.FLOWLINErecommendsthe useofredundant backupsystemsandalarmsinadditiontothe primary

system.Addingaredundanthigh levelfloatswitchto thesystemisacost  effectivemeanstoprevent costly

tankoverflows.

The switch has (3) relay channels.Normally open (NO) or normally closed (NC) operation is user selected

basedonthedesiredsystemcontrolandfail‐safelogicwhentheultrasonicinstrumentlossesitsreturnsignal

due to situations such as foam or condensation in the tank.Always design a fail‐safe system that

accommodates for the possibility of functional and/or power failure to the instrument.The "normal" relay

stateiswhere therelaycoilisde‐energizedandtherelayindicatorisOFF.Therefore,ifpoweriscutOFFtothe 

switch it will  de ‐energize the relay. Make sure that the de‐energized state is the safe state in your system

design.Assuch,ifswitchpowerislost,apumpwillturnOFFifitisconnectedtothenormallyopensideofthe

relay.

Flammable,ExplosiveorHazardousApplications:EchoSwitch®shouldnotbeusedwithinclassified

hazardousenvironments.

Components:EchoSwitch®isofferedinthreedifferentmodels.Dependingonthemodelpurchased,youmay

ormaynothavebeenshippedallthecomponentsshownbelow.

 EchoSwitch®

P/N Max.Range DeadBand Enclosure Thread

LU74‐5004

LU74‐5064

18.0’(5.5m) 8”(20cm) Type4X

2”NPT

2”G

LU77‐5004

LU77‐5064

9.8’(3m) 4”(10cm) Type4X

1”NPT

1”G

LU78‐5004

LU78‐5064

26.2’(8m) 8”(20cm) Type4X

2”NPT

2”G

 Viton®Gasket

o Part#200128forLU77series

o Part#220129forLU74orLU78series

 QuickStartGuide





1 2 3 4 5 6 7 8 9 10 ... 33 34

Sin comentarios

Flowline LU78 EchoSwitch Manual de usuario Pagina 5