389_389VP.pdf
爱默生389——389vp仪表Thereferencejunctionaidsinthesensor’sresistance
topoisoningionsandhelpsprolongsensor
life.Models389and389VPareprovidedwithatriple
junctionreference,whichprotectsthereferenceelement
frompoisoningions—suchasammonia,chlorine,
cyanides,andsulfides—in
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