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in my plant 100% feedwater control v/v is air to close but due to instrument air fail,the valve opens but instead of drum level high its get tripped in low low drum level.the urv of level tx is 0 and lrv is -800.pls tell me the reason. for such behaviour.
1 4407i have steam drum height 1000mm. and i want to placed the transmitter below the tap.how i calculate.
OEG,
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