Just curious if anyone out there has some insight that they can share with me on this one. We have a pretty new turbidity meter, which to the best of my knowledge has not had any issues since it was purchased about 2 years ago, not has it needed any type of maintenance, repair ro replacement parts.
Recently we have been having issues with getting the meter to standardize and stay that way. Most of the standards are off by greater than 10% on the first few attempts at analysis, and in the majority of cases they are out on the low side, and the higher the standard, the more the result is off from the target value.
Just today, I cam over and it was not zeroed at all. So I put the zero standard in the well and zeroed it without issues and then it was fine. About 20 minutes later I come back and it has already gotten off again without anyone touching it durring that 20 minute period. The only thing that changed was that I turned it off and then turned it back on.
I am curious (since there is not a great deal going on with a turbidity meter-light and detector) if it is the white light bulb needing to be replaced. Especially since it seems as though the longer the meter has been on, the better its performance becomes and the better it is able to hit the standard at their target values within a 10% SD.
If anyone knows how often the light bulbs need to be replaced or anything at all about how frequently you should replace, cean, etc. any of the parts on this bench top meter, then I would appreciate it. Oh and I have ordered new sample vials to make sure that it is not an issue with the vials being scratched on the outside causing the issues, however they have not yet come in.