What Your CO Reading Means
What Your CO Reading Means
A plain-English guide to the numbers on your VASAIKO HD16 — what is normal, what deserves a second look, and what to do next.
This is clean residential air. The EPA's 8-hour outdoor standard is 9 ppm, so readings here are unremarkable. Nothing to do.
Often from ovens, fireplaces, or a car idling in an attached garage. Ventilate the space and re-check in ten minutes. A reading that stays elevated with no obvious source deserves a technician's visit.
Ventilate and move everyone — including pets — to fresh air. If a UL-listed CO alarm sounds, get out and call 911. That instruction never changes, and a monitor does not replace it.
Good to know
- Gas stoves commonly produce brief readings of 5–15 ppm even when working properly (EPA). That is normal operation, not a fault.
- This is a monitor, not a laboratory instrument. Readings are for awareness and trend-watching — not for diagnosis. Accuracy is ±5% across the 0–999 ppm range.
- Keep it away from interference sources that can skew readings: synthetic detergents, alcohol, perfume, heavy dust, water vapour, and cooking fumes.
- Allow 60 seconds for the combustible gas sensor to warm up on first switch-on.
- Plug-in power with a 1,000 mAh battery backup (approx. 8 hours) — enough for a full night in a hotel room, and it keeps working through a power cut.
The difference in one sentence
A UL 2034-listed CO alarm is required to stay silent below 30 ppm — and a display model must read "0" down there. The HD16 shows the live number from the moment CO appears, so you can watch a trend instead of waiting for a threshold. Read why your ceiling alarm shows "0" →
HD16 is a supplemental monitor. It is not a substitute for UL 2034-listed CO alarms or UL 217-listed smoke alarms required by your state or local code. Keep your existing alarms installed and maintained.
Add the missing layer