Answer / saif chowdhury

Steam Drum Level Xmt Basically Known as a Wet leg Transmeter. when steam drum Actual level is zero The Transmitter output will be Maximum i.e 20MA.
Calibration procedure:
Normally the range will be very minor in negative MMH20 Or Milibar. Because LO Side tube hold higher pressure than HI Side.
1. Isolate the Both Tapping Point (by operator)
2. Ensure Do not drain the impules tube which is filled water. Because txr zero will shift which will affect proper reading. only for flushing pupose you can drain if the impuls line is pluged then you have to refill the water and make zero again.
3. To calibrate the transmitter close both isolation valve txr manifold.
4. Prepare the 5 steps Calibration Input range.
5. apply the pressure by the vacum pump.
6. After complete the calibration check both condensate pot if filled with water till the neck or water level is proportion the exact tapping point.
7. open isolation Txr Isolation valve from manifold check txr. reading is zero.
8 then proceed to commission the both tapping point block valve or Isolation Valve.
Hope this answer to your question. Good luck !

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