Problems with Level Measurement Using Displacer Sensor

S

Thread Starter

Shamsuddin

Dear All,

Fisher 249B with DLC 3010 is installed to measure level of liquid/condensate hydrocarbon of SG 0.51 at process pressure of 700 psi and temperature that varies from 80 degree f to 100 Degree f.

Problem is the PV drift in night from zero to 30 percent while actual level in glass gauge is zero.

What we have done is, PV trimmed zero and calibrated sensor (min/max and two point) with water, and it performs well with water. checked transducer card and electronic card of dlc 3010 and found o.k. (even we replaced dlc 3010 but no change. we don't have new displacer and deriver rod) checked plc input channels and cable and found them o.k. as well.

But problem still persists.

Any help shall be appreciated please.
Shams
 
It's hard to imagine a simple device like that drifting so far, is it possible it's temperature related? Perhaps try to warm it and see if it drifts back.

Are you sure you have the shipping stops off?
 
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