An old thread of mine but one that is still causing me headaches, lol.

But, I was browsing though some other threads and came across this....

Quote Originally Posted by Matthias View Post
We found out that all issues with bad probe readings (in most cases redox, in rare cases pH and cond.) had been produced through other devices or bad probes, as far as I know all issues had been solved.
In my opinion an isolator is pointless, for this this reason the development and production (which costs a lot of money initially) hasn`t a high priority anymore at the moment.

This could help:
- if the probe is defective (too old) replace it
- if you have an ungrounded ProfiLux power supply the use of a grounded power supply may help to eliminate the interferences from the Tunze pumps (the latest ProfiLux are shipped with a grounded PSU as standard in order to get rid of problems with noise from 3rd party products)
I have found that by grounding my Profilux, not on purpose but by having the USB lead connected to a PC which is grounded the fault goes away, so it looks like I need a grounded PSU to fix my fault.

Are you able to supply one guys or should I contact Steve here in the UK.

Thanks

ps, Steve will be pleased as I have borrowed his P3 to eliminate the unit, he can have it back now. (hopefully the PSU will fix my fault)


pps, as Matthias knows I am running VorTechs, so this could be the source of the 'noise'.