In close vessel/ drum why we use d.p. transmitter of -ve
range i.e. (-)500 to 0 mmwc.
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Answer Posted / venbha123
If the LP leg of the transmitter is kept dry, steam may get condensed in the LP leg because of which the level indication may be wrong. Hence We are using wet leg for LP side of the transmitter, which is initially filled with pure water. When the drum is at zero level, the pressure difference is only the head pressure acting on the LP side - that is 100% level head at LP side. Normally in DP transmitter the HP side pressure will be more than the LP side. In this case since the pressure in the LP side is more than the pressure in HP side the range is mentioned as negative. At 100% level both the head pressures at HP & LP are the same, the DP becomes zero. Therefore the range is mentioned as: from negative value to zero.
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