The vibration puck that only lies in the afternoon
A rooftop compressor looked healthy at 08:00 and wild at 15:00. The bearing was fine. The puck was cooked.
Field notes
Short records from visits. They name hardware and weather, not slogans.
When the gateway sleeps through the pump cycle
A lift-station pump ran at 02:10 every night. The gateway’s buffer was set to flush at dawn. The night never existed in the file.
A level float full of last year’s leaves
A tank reported ‘high’ for eleven days. The liquid was normal. The float was a nest.
What to put in the escort brief before we arrive
A useful escort brief is one page: hazards, keys, which cabinets stay closed, and who can isolate a circuit.
Sensor drift versus a loose ferrule
Slow temperature rise on a dryer looked like ageing of the RTD. It was a ferrule that a fitter had left a quarter-turn shy.