The Delta P92 is a Halstrup‑Walcher differential pressure transducer that uses a beryllium bronze membrane spring and an integrated bridge sensor to convert pressure differences into a 4–20 mA or 0–10 V output. Common failure modes include membrane fatigue or cracking, corrosion of the measurement capsule, drift in the signal conditioning IC, and loss of power supply isolation due to moisture ingress (IP68 rating). First‑check steps: verify that the unit receives the correct 24 VDC input and that the output signal is within spec; inspect the pressure ports for blockages or leaks; review any error codes on the host controller and confirm proper grounding and shielding of the wiring harness.[oss-gpt-20b]