Best Portable CO Detectors for Pilots: Tested Picks, Panel Placement & Care
Carbon monoxide is a colorless, odorless, and lethal threat in any piston aircraft cabin. With the NTSB urging pilots to adopt active alerting detectors, choosing the right device is a critical safety decision. To help you make the right choice, our team of experienced pilots put the top portable CO detectors to the test in real-world cockpit conditions. This guide provides our unbiased 2026 picks, shows you the FAA-researched best location for mounting, and covers the essential maintenance to keep you safe on every flight.
Carbon monoxide (CO) is a silent killer in general aviation. This colorless, odorless gas can quickly incapacitate a pilot, often from a tiny, undetected exhaust leak. After a series of accidents, the NTSB urged the FAA to require active, alerting CO detectors in GA, because passive "spot" cards are easy to miss under workload.
This guide cuts through the noise. We will show you which detectors we trust, exactly where to mount one, and how to maintain it for reliable protection.
Quick answer: For an alerting cockpit CO detector, our top overall pick is the Sensorcon AV8 Inspector Pro ($194), which adds a vibration alert, adjustable alarm set-points, and a 24-hour exposure readout for multi-leg days. The Sensorcon AV8 Inspector ($164) is the best value, with the same electrochemical sensor and set-and-forget preset alarms. Add an ASA spot card as a low-cost passive backup.
Our Top Picks: Quick Comparison
Note: The 35/200 ppm alarm points align with NIOSH occupational guidance (REL 35 ppm TWA; 200 ppm ceiling). They are not an FAA or NTSB "standard." Prices shown are current at Pilot Mall as of July 2026 and may change.
| Model | Price | Best For | Low/High Alarm (ppm) | Vibration | 24-hr TWA | Calibration | Bracket |
|---|---|---|---|---|---|---|---|
| Sensorcon AV8 Pro | $194 | Overall Performance | 35 / 200 adjustable (adjustable) | Yes | Yes | Every 6 months | Included* |
| Sensorcon AV8 | $164 | Best Value | 35 / 200 (preset) | No | No | Every 6 months | Included* |
| ASA Spot Detector | $4.45** | Essential Backup | N/A (color change) | No | No | N/A | Adhesive |
*Bracket included; mounting hardware not included. **ASA spot card availability is limited; check the product page for current stock.
Why Active Alerting is a Cockpit Essential
Investigators and safety bodies advocate active aural and visual alerting because it breaks through cockpit workload. The NTSB has repeatedly pushed the FAA to require detectors with active alerts in GA (most recently in its 2022 safety recommendation report, which cited 31 CO accidents between 1982 and 2020, 23 of them fatal). The UK Civil Aviation Authority went further: since January 2025 it requires a functioning active CO detector aboard many piston-engine aircraft when carrying passengers who do not hold a recognized pilot qualification. Use passive cards only as a secondary layer.
Detailed Product Reviews
Sensorcon AV8 Inspector Pro, Best Overall ($194)
The Pro is our top choice when you want maximum situational awareness. The vibration alert is invaluable in loud cockpits where a beep can be missed.
- Standout features: Triple alerting (beeper, LEDs, vibration), adjustable low/high alarms, and a 24-hour TWA exposure readout for multi-leg days. Panel bracket included.
- Care and maintenance: Calibrate every 6 months. An end-of-life (EOL) icon appears at about 2 years; each successful calibration extends service by roughly 180 days while the sensor remains healthy.
- Battery: CR123A (user-replaceable); typical life up to about 2 years depending on alarms.
Sensorcon AV8 Inspector, Best Value ($164)
Same core electrochemical sensor and loud alerts as the Pro, with preset alarms ideal for most pilots.
- Why pilots pick it: Set-and-forget factory alarms (35 ppm low / 200 ppm high), MAX-hold (peak) reading, 2-year warranty, and a panel bracket in the box.
- What you give up: No vibration alert, no custom alarm set-points, no TWA display.
ASA Carbon Monoxide Detector (Spot Card), The Essential Backup ($4.45)
A battery-free indicator that darkens in the presence of CO. It is not a primary detector, but it is a simple, visible backup layer for a few dollars.
- Good to know: Service life is 12 months after opening; typical 3-year unopened shelf life.
- Placement tip: Avoid harsh direct sunlight, which can bleach the spot.
- Availability: Stock on the spot card is limited. If it is sold out, browse the CO detectors collection or pair a Sensorcon with any aviation spot card you already own.
Where to Mount Your Detector in a C172 & PA-28
Do not just clip it anywhere. FAA-sponsored flight tests found the instrument panel had the highest probability of catching elevated CO across the cabin. For better capture of cabin events, set your low alarm near 35 ppm; this improves detection of 50 ppm or more anywhere in the cabin.
- Recommended: Mount the electronic detector on the panel with the sensor inlet unobstructed.
- Backup: Place any spot card within your normal instrument scan.
Frequently Asked Questions (FAQ)
What should I do if my CO alarm goes off in flight?
Act immediately: turn OFF cabin heat, open all fresh-air vents, consider oxygen if available, advise ATC as needed, and land as soon as practical. Do not fly again until an A&P inspects the exhaust, heat exchanger, firewall and seals.
Can I use a cheap home CO detector in my airplane?
Not recommended. Residential units listed to UL 2034 are intentionally insensitive at low levels (for example, no alarm at 30 ppm; an alarm at 70 ppm can be delayed 60 to 240 minutes) to reduce nuisance trips in homes. They are optimized for home environments, not vibrating, sun-heated cockpits. Choose an aviation or industrial unit with real-time ppm and active alerts.
How often do I need to calibrate my Sensorcon?
Every 6 months. Expect an EOL indicator at about 2 years; a successful calibration clears EOL for about 180 days at a time while the sensor remains healthy.
Complete Shopping Checklist
- Primary detector: Sensorcon AV8 Inspector Pro ($194) or AV8 Inspector ($164).
- Backup: ASA Spot Card ($4.45, availability permitting).
- Extras: Spare CR123A battery, alcohol wipes for the sensor inlet, and a small panel-mount hardware kit (for example, #6 or #8 machine screws, washers, nyloc nuts).
- Browse all: Pilot Mall CO Detectors.
About the author: Neil Glazer is a commercial pilot (multi-engine and instrument rated) and the owner of Pilot Mall. He flies piston singles regularly and has tested cockpit CO detectors in real general-aviation conditions. Questions about CO protection for your aircraft? Reach the Pilot Mall team, who fly and use this gear too.
