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BLACK NPD BEAD signal output unstabil

Question asked by cocones on Jan 24, 2019
Latest reply on Dec 17, 2019 by james_jenkins

Hi all,

I all way use white bead for NPD dedectors. When I change to Black bead. ( applyed replacement procedure)

Signal output unstable.

set to 30 pA. start adjust, 30min later complet adjust . But output goes to 15 pA and up to 30 pA. this cycle all ways continuous

h2 : 3 ml 

air: 60 ml

h2 supplay pressure : 1.5 bar

air supply pressure: 3  bar

bead voltage off position : output 2.1pA.

I waiting your advice.


Best regards.