Level transmitters discrepancy

[Sabeur]

Dear All,
I'm C&I engineer working on Level transmitters Trouble shooting. The problem that:
I have level transmitters mounted on the same vessel at the same height but presenting some discrepancies.
I explain more the situation:
Each vessel has two DP level transmitters , same model ( Rosemount ): One for the safety and the other for control.
I will be very thankful if you give me your ideas and views concerning this.

Best Regards,

[bitmap]

Hi,

is the lower pressure port at the same pressure in both transmitters?
The span, LRV and URV of the transmitters is the same?

regards,

[amshah]

Hi,

is the lower pressure port at the same pressure in both transmitters?
The span, LRV and URV of the transmitters is the same?

regards,

If everything is same then check, mounting zero.

your problem will be solved.

[Sabeur]

Thanks every body for your help,
@ bitmap:
not all of them having the same pressure tapping points.
But the problem consists that the given values are not adequate. I explain, when LT01 displays 50% the other must dispaly 30% (theoretically) but really it displays 15% for example.