Leybold Vakuum PEC050 is a high‑accuracy vacuum pressure transducer used to monitor industrial vacuum systems; it typically outputs either analog (4–20 mA) or digital (Modbus/RS‑485) signals and includes an internal microprocessor for calibration and self‑diagnostics. Common failure modes on this class of sensors include drift in the sensor output due to contamination or aging of the Pirani element, loss of signal caused by broken wiring or connector corrosion, and power supply voltage spikes that damage the electronics board. First‑check diagnostics should verify the 24 V DC input and ensure it is within ±5 % tolerance; inspect all connectors for signs of oxidation or mechanical wear; and read any error codes via the sensor’s diagnostic port (e.g., Modbus fault registers) to identify internal faults.[oss-gpt-20b]