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We have closed tank 2.5 m height. application level measurement of propane oxide with nitrogen gas. we are using here SITRANS P DSIII DPT with both end remote seal's. we have calibrate this transmitter 0 to 2000 mmwc & zero adj. then fill PO 1130 litter mean. level shall be 213 mm but transmitter displaying 670 mm. please guide.

See pages 12-14 of the manual here:

http://www2.emersonprocess.com/siteadmincenter/PM%20Rosem ount%20Documents/00809-0100-4592.pdf

for description of zero elevation and suppression

examples of the zero/span calculations for remote seal elevated/suppressed zero are shown on pages 17-22 of the manual located here:

http://www2.emersonprocess.com/siteadmincenter/PM%20Rosem ount%20Documents/00809-0100-4002.pdf

Suresh,

Put both end remote seal to the atmosphere, I mean close the block valve and loose the nuts, then see how much mmwc are u sensing.

Use this mmwc for to calculate the range, if you have remote seal and your 4mA point is 0 mmwc maybe are you making a mistake

Regards,
JP