Absolute pressure transmitter APM-2

differential4-20 mAHART

Modular electronic differential pressure transmitter APM-2 is applicable to hydrostatic measure of level in closed tanks, density or phase boundary. The measuring system consists of 3 separate modules – central unit and two absolute pressure transmitters. Level is calculated in central unit basing on measurement from two pressure transmitters. High pressure transmitter measures hydrostatic pressure of liquid in tank, low pressure transmitter measures pressure of gases above the liquid. Differential pressure is calculated in the central unit. With default settings of central unit function of high pressure transmitter is designed for transmitter directly connected with central unit (PC1). User can change this assignment to second transmitter by changing configuration in central unit in local menu or via HART protocol. Measuring points can be several dozen meters apart. The casing of central units is made of aluminium alloy cast or stainless steel with degree of protection IP66 or IP67 equipped with local display and buttons for configuration. Measuring element of each of absolute pressure transmitters is piezoresistant silicon sensor separated from the medium by diaphragm and manometric liquid. Process connection of absolute pressure transmitters can be diaphragm seal or threaded flush connection. By using diaphragm seals transmitters can be used for measurement of contaminated medium, medium with high viscosity, very hot or very cold medium or medium where sanitary process connection is needed. Electronic units of pressure transmitters are closed in sealed stainless steel casings with degree of protection IP67.