3 element boiler drum level?
A three element boiler drum level control senses three variables (elements) which are used to control the water level in a boiler drum. These variables are A.) Level in the drum B.) Feed Flow rate into the drum C.) Steam Flow rate from the boiler. The combination of these three variables helps the automation determine how to best control the feed valve under all load conditions. For propulsion boilers which can rapidly change load the three element regulator is best (compared to a single or dual element) for the compensation of shrink and swell effects on drum level under rapid load changes.
A differential-stress transmitter tailored to furnish a demonstration proportional to a procedure variable inclusive of bypass cost in a line accomplishing fluid or the point of liquid in a tank, the technique fluid being at a temperature markedly at variance with ambient temperature. The transmitter is constituted through severe and espresso stress sensors that are coupled to the stress beam of a stress stability transducer so as that the beam is conscious of the version between sensed severe and espresso pressures derived from the technique variable, the transducer being uncovered to ambient temperature. each and each and every sensor is constituted through a housing having a properly therein coated through a sensing diaphragm and an insert seated in the properly, the face of the insert being spaced from the diaphragm to outline a fill chamber containing hydraulic fluid, the sensor diaphragm being uncovered to the technique liquid, wherein warmth move takes position between the liquid and the hydraulic fluid. The insert is formed of a metallic having a low coefficient of boom relative to the fabrics of the housing wherein alterations in temperature produce variations in the size of the housing relative to that of the insert and resources upward push to variations in the volume of the fill chamber to an volume compen
