from the Instrument department...
Calibration of Level transmitter (displacer type)
Application Questions and Problems topic
Posted by Wasim Ullah Khan on 26 September, 2003 - 5:01 pm
How do we calibrate a level transmitter(displacer type)in interface level. Lets say specific gravity of water/condensate=1/0.7

Posted by Craig on 28 September, 2003 - 3:11 pm
Interface level can be tricky I assume you are using ultra sonics with a target attached to the displacer and the displacer will obviouly float on the water level inter face. To do this the float should be filled to allow it to float on the water. THe range is then set by the height the water level rises. A second unit can also be used to float on the condensate in a similar manner to get a more accurate reading. This system works well given that no drastic changes in SG occur

Posted by sandeep datar on 29 September, 2003 - 11:23 pm
If u r using a typical 4-20 MA O/P inst with a displacer float, then fill the chamber (100%) with higher density liquid. Adjust 4 MA. Then fill chamber with lower density/equiv. liquid (100%) and adjust 20 MA.

Posted by Anonymous on 22 January, 2004 - 2:39 pm
this is to be done in the reverse way.

Posted by Anonymous on 28 June, 2004 - 8:56 am

First you want to fill with lower specific gravity liquid (Condensate) up to given range level and then adjust for zero that means 4mA , and after that drain that codensate and now filled with water up to given range and adjust for span that means 20 mA.

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