The purpose of steam flow meter with temperature and pressure compensation is for when the volume deviate the actual flow compensation will correct the result well. Steam in gas status, the density varies with the changes of temperature and pressure itself. If don’t have the compensation will cause a huge error. Take a example, saturated steam in 1Mpa, when pressure drop to 0.8Mpa, density will reduce 82% compared with default value, if flow meter without temperature and pressure compensation like differential pressure flow meter the reading value will increase 10.4%, for vortex will increase 21.9%. Apparently, it’s essential to have the temperature and pressure compensation.