PMD78B

The differential pressure transmitter measures by detecting the pressure difference between two pressure points. The device is connected to different measurement points of the process system through two pressure ports: the high-pressure side (HP) and the low-pressure side (LP). When gas or liquid media act on both sides, the generated differential pressure (ΔP) causes the internal sensing element, such as a metal diaphragm, to deform mechanically. This deformation is converted into an electrical signal through capacitive sensing or resistive strain gauge technology. The signal is then processed by the signal conditioning circuit, including amplification, linearization compensation, and temperature correction. Finally, the transmitter outputs an industrial standard 4–20 mA analog signal or digital signals such as the HART protocol.

Foundamental

PMD78B is one of the members of the new generation Deltabar transmitter family. The transmitter features a rugged and durable design with secure Bluetooth connectivity, allowing remote operation via a mobile device with the dedicated app installed. It supports condition-based maintenance, improving plant availability. The software is also easy to use. Intuitive operation guides help users complete instrument configuration, functional safety tests, and verification tests step by step. Heartbeat Technology provides self-verification and self-monitoring functions, enabling detection of process abnormalities such as blocked impulse lines.