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1. What are the operation steps for the initial startup of a differential pressure transmitter used to measure steam flow rate after it has been installed? 1) Check whether each isolation valve, pressure guide tube, union, etc. are securely connected ； 2) Check whether the secondary cutting and sewage discharge valves are closed, and whether the balance valve is open ； 3) Open the valve slightly once, then check the pressure guide tube, valve door, union fittings, etc.; if there is no leakage, open the valve fully ； 4) Open the drain valves separately, discharge the waste fluid, and then close the drain valves ； 5) Loosen the screw plug in the differential pressure chamber to remove the air from it ； 6) The differential pressure transmitter can be started only after the pressure guiding pipe is filled with condensed water ； 7) To start the differential pressure transmitter, the positive pressure valve should be opened, the balance valve should be closed, and the negative pressure valve should be opened. 2. What are zero adjustment and zero shift of pressure or differential pressure transmitters? Zero-point adjustment: refers to the adjustment of the zero point when the input pressure or differential pressure is zero, but the output is not zero ； Zero-point migration: refers to the adjustment in which the output is set to zero when the input pressure or differential pressure is not zero. 3. Pressure can be divided into static pressure, dynamic pressure, and total pressure. What is the relationship between them? What pressure does a pressure transducer measure? Total pressure = dynamic pressure + static pressure, and the pressure transducer measures the static pressure.