PT717-BA differential pressure transmitter uses advanced micro-silicon solid-state composite sensor, adopts modular design, and consists of sensor module with integrated electronic adaptation unit and amplifier with button control unit.The sensor of PT717-BA differential pressure transmitter is a dual-cavity system with all welded sensor modules, which has an integrated overload diaphragm, an internal differential pressure sensing chip, an internal absolute pressure sensing chip and a temperature measuring element. The absolute pressure sensing chip only feels the pressure on the high pressure side as a reference value for static pressure compensation. The low-voltage side of that differential pressure sen chip is connected with the low-voltage side of the transmit through a capillary tube. The measured process differential pressure is transmitted through the isolation diaphragm and filling liquid.When the differential pressure sensor chip is supplied, the resistance of the micro-silicon solid-state differential pressure sensor chip changes slightly, which further leads to the change of the output voltage of the detection system. The output voltage is proportional to the process differential pressure and is converted into a standard output signal by the adaptation unit and amplifier.