Hi,
Are you certain that .1 and .3 don't represent 10% and 30%? If not then it sounds dead.
Normal practice would be to test it against Air and calibrate to 20.9 but then also a known reference gas. Maybe you have some 32% around
Some great articles (probably way more than you ever wanted to know) here:
Dive Gear Express® | Official Site | Dive Gear Express®
A relevant quote from the last paragraph of that one "Typical life of an analyzer sensor is somewhere between 24 and 48 months (I've seen plenty of them last 60 months and longer)"
Understanding Oxygen Sensors ADVANCED DIVER MAGAZINE byPaul Raymaekers
useful info from this article on checking the manufacture date of the sensor, keeping in mind that it could legitimately be on the shelf (in the packet) for up to a year after that.
"The production date of sensors is printed on the sensors, in different ways. Two common methods are:
- 3 numbers where the first indicates the last number of the production year, and the 2 others the month (example: 805XXX : 5th month of 2008, or may 2008)
- a letter followed by a number, where the letter indicates the month, and the number the last number of the year (example: A8 : January 2008)"
So based on that, if your manufacture date of the cell is more than 5 or 6 years ago, there is probably zero chance that the cell has any life left.
If you have a multi-meter then you can also check the cell (without the analyser box). they should read about 10mV in Air.
Dean