Level Gauge and DP Level

Yes.

Figure out which one is right and fix the other one.

Once again, in keeping with CR4 style, a truly pathetic first post.

The difference in readings between two instruments can probably be explained, I've spent a lifetime in process instrumentation doing so, but only after an analysis of an extensive amount of data.

An analysis can't even begin because of the lack of the most basic information, for instance, what technology the claimed 'level gauge' is, to say nothing of the lack of critical data like

- actual reading values at various levels (all 3 readings - DP, 'level' and a physical tape), preferably with a readable trend graph of the first two over some time period)

- brand, model number and details of sensors

- what the 'readout' comes from and how the readout is configured

- range and associated configuration data for the sensors

- details for DP: HI side attached to _____, Low side attached to ______

- photos of the physical installation of the sensors

- scaling factor configuration data for the receiver device for the DP signal

- tank shape and material of construction

- elevation dimensions for mounting of sensors and associated elevation level points for the

medium (defines what is expected measurement points)

- measured medium in tank and its characteristics, temperature

- wet leg fill medium and details of its installation

- atmospheric blanket medium and its pressure

- what constitutes the claimed 'calibration' [the word itself is meaningless in the original context]

In the absence of any meaningful data, I have to ask, why 2 level sensors?

What's the history that a 2nd sensor was added? If the first one was not believed to be true, why would the addition of a 2nd measurement expected to match the first unbelievable sensor? How do you get a believable to match an unbelieveable? Why would you even expect that to happen?

Let the speculation begin, it'll amuse us all.

We already have "barometric pressure". I'll throw in "loose fitting", how's that for an answer?