What to log (and how often)

Daily (shift start & end):

  • O₂ (ppm), dew point (°C), pressure (mbar)
  • Transfers: count & which antechamber used
  • Solvent events: open containers, heavy use, trap changes

Event-based:

  • Regeneration start/stop, max temp/flow, result
  • Leak-rate test results (weekly/quarterly)
  • Sensor checks (zero/span or cross-check)

Keep one page: numbers + short notes (e.g., “3× large transfers; cold trap swapped”).

Practical alarm setpoints (tune to your process)

  • O₂ high-warn: 5 ppm → high: 10 ppm
  • Dew point warn: −35 °C → high: −30 °C
  • Pressure low: < +2 mbar → high: > +15 mbar (relief valve crack ~ +10–15)
  • Antechamber discipline: flag if cycles < 3 before inner door
  • Sensor health: stale/no data > 15 min → comms alarm
  • Plot 7-day moving average for O₂ & dew point; overlay daily min/max.
  • Rising dew point with flat O₂ → suspect solvent vapor.
  • Both rising together → leak or purifier.
  • Pressure variance up → check PID/flow or glove handling.

When an alarm fires (90-second playbook)

  1. Check pressure is within +3–8 mbar (stability first).
  2. Look at the last transfers: was the antechamber equalized? If not, fix SOP.
  3. Solvent check: lids on, traps cold/charcoal refreshed.
  4. Sensor sanity: quick 2-point for O₂ (zero + air/span) or cross-check dew point.
  5. If still high: run a short purge; schedule regen if trends say it’s due.
  6. Document what you did and how the numbers moved.
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Older Glove Box Feedthroughs & Ports: What to Specify (Power, Gas, Vacuum, Data)