DPT tansmitter is the abbreviation of differential pressure transmitter. A differential pressure transmitter is a type of instrument used to measure the difference in pressure between two points in a system. It consists of a sensor that measures the pressure at one point, and a reference point that is used to compare the measured pressure to a known value. The transmitter sends a signal to a display or control system, which can be used to monitor and control the pressure within the system. Differential pressure transmitters are commonly used in a variety of applications, including HVAC systems, process control, and fluid flow measurement.