The Drexelbrook 408‑6230‑001 is an RF‑admittance level transmitter used for continuous liquid or slurry measurement in process plants. Common failure modes for this class include loss of signal due to cable corrosion, dielectric breakdown in the probe housing, and internal power supply degradation leading to intermittent operation. First‑check diagnostics should verify that the unit receives proper 24 VDC (or specified) input, inspect all wiring and connectors for corrosion or damage, and confirm that the transmitter’s output (typically 4–20 mA or 0–10 V) is within spec using a calibrated loop calibrator. If available, review any stored error codes via the manufacturer’s diagnostic interface before proceeding with internal component inspection.[oss-gpt-20b]