Sensorcon CO erratic readings

[wKkaY]

Recently I bought a sensorcon CO monitor. The day it arrived, it read zero in my house, and 5ppm from my pony tank - I was quite pleased to see it working!

Two weeks later, I'm on a dive trip and it reads 30-50 ppm in the room, on the beach, at sea etc.

After some troubleshooting I think that it might something in my save-a-dive box that's causing it. Taking it out of the box overnight made it drop to ~5ppm.

My box contains a bunch of stuff like. Bungee cord, zipties, orings, cave line, mouthpiece, tools (scissors/wrench/multitool), silicone lube, sharpie, spray bandage, iodine, bandaid, panadol.

Which of these is most likely to cause the erratic reading?

 

[Jcp2]

http://s7d9.scene7.com/is/content/m...-MC_COSensor_InfluenceofAlcohols_VOCsHydrogen

It could be any one of the plastic/rubber products off gassing VOC or the spray bandage leaking alcohol vapor.

 

[Altamira]

I keep my Sensorcon in double zip locked bags (one inside of the other), with as much air removed as possible, when I am not using it. I test it inside of the bags before storing to insure I have not trapped any CO in the bag. So far no problems.

 

[Brilig]

I use a Sensorcon Inspector. I read somewhere that a temperature swing can throw it off. The instructions say that exposure to heat and humidity can damage the sensor. I wouldn't just toss it in the save a dive box loose. I store mine at home in a desk draw because I own my own tanks and test them at home after filling.
If I were to take the Sensorcon diving in order to test rental tanks on a dive boat I would store it in a small Otterbox or zip-lock bag even though that's a bit extreme.
The thing is waterproof but long term damp storage combined with heat can damage the sensor.

 

[wKkaY]

Ok so I've owned this a year now. I've been transporting it in a ziplock bag in my backpack, instead of chucking it into the same mask box as my save-a-dive kit (and then into a suitcase). I haven't had false positive readings for awhile now.