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  Measurement, Test and Calibration

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Lurker (<10 Posts)

Posts: 4
From:Warri, Delta state, Nigeria
Registered: Aug 2000

posted 21 August 2000 11:11 AM     Click Here to See the Profile for VALENTINEO   Click Here to Email VALENTINEO     Edit/Delete Message   Reply w/Quote
Does preventive maintenance have any positive effect on smart transmitters? or should they be run to failure and replaced?

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Jerry Eldred
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Posts: 136
Registered: Dec 1999

posted 21 August 2000 11:55 AM     Click Here to See the Profile for Jerry Eldred   Click Here to Email Jerry Eldred     Edit/Delete Message   Reply w/Quote
I have heard both sides of this issue. This is, again, an issue where you need to evaluate the transmitters performance against the process or application tolerances. If the unit will drift out of an acceptable tolerance limit and still be operating properly (other than the tolerance drift), then there is certainly value, as you need to be sure that the readings it gives you are accurate enough for your need. There are applications, also, where transmitter accuracy is not important, and an inaccurate reading is not important to the correct performance of the process being monitored. Those questions will need to be answered before making such a decision.

The other issue is unstable operation. I certainly won't be the one to give someone an excuse to save moneyt by not doing correct maintenance. It could well be (in some applications) that accuracy is not an issue, but unstable operation is still important. In those cases, maintenance is still important, but for other reasons. I don't believe there is a single correct answer to this. Each application needs to be evaluated to determine how much change in the transmitter's readings and feedback is acceptable. The implications of an incorrect reading from the transmitter must be evaluated, and determination made as to what amount of error can be tolerated. How often, and what type of maintenance is performed must be based on the answer to that evaluation.


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