Quality Carbon Monoxide Detectors for Scuba Cylinders

[bpodbielski]

Haven't seen anyone recommend this one yet, but take a look at OxyCheq Expediton CO analyzer.

This comparison was interesting for me:

CO Analyzer Comparison​
​	OxyCheq Expedition CO​	Analox EII CO​
Price​	$400 MSRP​	$355 MSRP​
Replacement Sensor​	$140.00 MSRP​	$240 to $250 (MSRP / Exchange rate)​
Alarm​	Sounds @ 10 PPM +/-1 PPM​	No Alarm​
Measurement Range​	0-100 PPM​	1-50 PPM​
Sensor Life​	3.5 + Years​	2 years​
Sensor Accuracy​	+/- (1% FS + 1% value)​	+/- (1% FS + 5% value)​
Sensor Drift​	Less than 0.5 ppm Annually​	6.0 ppm Annually​
Calibration*​	When New Sensor Installed or 3.5 years.​	Every time used – Prior to every dive with Bump Test​
Hydrophobic Membrane​	Yes​	No (None Noted)​
Bump Test Required for Calibration​	No​	Yes ($80 USD) Valid for only 20 Bump test (uses)​
Temperature Compensated​	Yes​	No (Not noted or found)​
Power​	3 ea AAA​	1 ea 9V​
Battery Replacement​	2-3 years (Occasional Use) 1 year (Inline Compressor Use)​	1 year​
Display​	3 Digits​	2 Digits​
Warranty (Sensor)​	1 year (prorated)​	1 year (prorated)​
Hand Held​	Yes​	Yes​
Compressor Inline Use​	Yes​	No​
Continuous Use​	Yes​	No​
Flow Restrictor (s)​	Yes (Optional / Recommended)​	No (No Options)​
Purchase price​	Analyzer $400 (MSRP) w/ Case Optional Restrictor: $40.00 Total: $440.00​	Analyzer: $355.00 (MSRP) (No Case) Bump Tester: $80.00 (20 dives) Total: $435.00​
1 Year Expense​	None​	Bump Tester: $80 (20 dives) Battery: $1.50 - $3​
2 Year Expense​	Batteries $2 - $4​	Sensor: $240.00 Bump Tester: $80.00 (20 dives) Battery: $1.50 - $3​
3 Year Expense​	None​	Bump Tester: $80 (20 dives) Battery: $1.50 - $3​
4 Year Expense​	Sensor $140.00 (3.5 – 4 years) Calibration: ~ $55 Batteries $2 - $4​	Sensor: $240.00 Bump Tester: $80.00 (20 dives) Battery: $1.50 - $3​
Total Cost Over 4 years​	$600.00 (w/o Flow Restrictor) Does not include batteries ($4 - $8)​	$1235.00 Does not include batteries ($6 - $12)​

Cave Adventurers - OxyCheq Expedition Carbon Monoxide Analyzer w/ Alarm - Marianna, Florida USA - Never Undersold!

OxyCheq Expedition Carbon Monoxide Analyzer w/ Alarm

www.caveadventurers.com

 

[BoltSnap]

Haven't seen anyone recommend this one yet, but take a look at OxyCheq Expediton CO analyzer.

This comparison was interesting for me:

​

CO Analyzer Comparison​
​	OxyCheq Expedition CO​	Analox EII CO​
Price​	$400 MSRP​	$355 MSRP​
Replacement Sensor​	$140.00 MSRP​	$240 to $250 (MSRP / Exchange rate)​
Alarm​	Sounds @ 10 PPM +/-1 PPM​	No Alarm​
Measurement Range​	0-100 PPM​	1-50 PPM​
Sensor Life​	3.5 + Years​	2 years​
Sensor Accuracy​	+/- (1% FS + 1% value)​	+/- (1% FS + 5% value)​
Sensor Drift​	Less than 0.5 ppm Annually​	6.0 ppm Annually​
Calibration*​	When New Sensor Installed or 3.5 years.​	Every time used – Prior to every dive with Bump Test​
Hydrophobic Membrane​	Yes​	No (None Noted)​
Bump Test Required for Calibration​	No​	Yes ($80 USD) Valid for only 20 Bump test (uses)​
Temperature Compensated​	Yes​	No (Not noted or found)​
Power​	3 ea AAA​	1 ea 9V​
Battery Replacement​	2-3 years (Occasional Use) 1 year (Inline Compressor Use)​	1 year​
Display​	3 Digits​	2 Digits​
Warranty (Sensor)​	1 year (prorated)​	1 year (prorated)​
Hand Held​	Yes​	Yes​
Compressor Inline Use​	Yes​	No​
Continuous Use​	Yes​	No​
Flow Restrictor (s)​	Yes (Optional / Recommended)​	No (No Options)​
Purchase price​	Analyzer $400 (MSRP) w/ Case Optional Restrictor: $40.00 Total: $440.00​	Analyzer: $355.00 (MSRP) (No Case) Bump Tester: $80.00 (20 dives) Total: $435.00​
1 Year Expense​	None​	Bump Tester: $80 (20 dives) Battery: $1.50 - $3​
2 Year Expense​	Batteries $2 - $4​	Sensor: $240.00 Bump Tester: $80.00 (20 dives) Battery: $1.50 - $3​
3 Year Expense​	None​	Bump Tester: $80 (20 dives) Battery: $1.50 - $3​
4 Year Expense​	Sensor $140.00 (3.5 – 4 years) Calibration: ~ $55 Batteries $2 - $4​	Sensor: $240.00 Bump Tester: $80.00 (20 dives) Battery: $1.50 - $3​
Total Cost Over 4 years​	$600.00 (w/o Flow Restrictor) Does not include batteries ($4 - $8)​	$1235.00 Does not include batteries ($6 - $12)​

Cave Adventurers - OxyCheq Expedition Carbon Monoxide Analyzer w/ Alarm - Marianna, Florida USA - Never Undersold!

OxyCheq Expedition Carbon Monoxide Analyzer w/ Alarm

www.caveadventurers.com

This one has been out of stock for a very long time "DUE TO SUPPLY CHAIN ISSUES."

Expedition CO Analyzer w/ Alarm ... OUT OF STOCK DUE TO SUPPLY CHAIN ISSUES

Expedition Carbon Monoxide Analyzer with Alarm. Compact and fits in your hand Range: 0-100 ppm Accuracy: +/- 2 ppm Alarm: Alarm sounds @ 10 ppm (+/- 1ppm) Sensor: Galvanic (Replaceable) Cost to Replace Sensor: ($140 MSRP) Response Time: 95% @ 10 seconds (May very in extreme temperatures) Sensor...

www.oxycheq.com

 

[grf88]

I bought an Analox CO meter when they first introduced them but unfortunately they discontinued support and replacement sensors became exorbitant. It may very well have saved my son's life however when we discovered 80ppm in his tank on a dive trip. Since then I have used the Sensorcon and used the flow restrictor from the Analox with it. The Sensorcon is sensitive to flow and pressure but if it reads zero no need to check further. If it doesn't read zero then use the bag method.

 

[DandyDon]

Do we need to test every cylinder or just nitrox?

Every tank, otherwise you're gambling.

Where's @DandyDon? I'm surprised he hasn't chimed in here yet on this one.

Well, the thread is going well without me. I am a CO fanatic but not an expert.

Analox EII CO

Obsolete.

The Sensorcon is sensitive to flow and pressure

Yeah, that's why I use a gallon ziplock, the ones with the handles for easy closing. You still gotta avoid motor fumes.

 

[LFMarm]

I use this one (Carbon Monoxide Meter | USA NIST Calibration) fed with a DiveSoft flow limiter (Divesoft Professional Flow Limiter MK2 DIN G/58) that I also use for my trimix analyzer. You can replace the whole analyzer every 2 years for less than half the cost of a sensor from other manufacturers.

Even very small concentrations of CO can be fatal for deep CC dives. I have been checking every tank, including those for shallow OC dives, since getting the analyzer. Luckily all my readings have been <5 ppm so far (vast majority 0 ppm).

 

[LFMarm]

I recommend reading this article from DAN to anybody who questions the importance of CO analyzing: Carbon Monoxide Safety

Even small amounts at the surface can have very significant effects at depth. Here is the example for a gas with 10 ppm at the surface. It becomes high as of 30 m and dangerous as of 60 m.