we regret the problem with this O2 sensor. Here our explication, perhaps you can inform your customer accordingly and this may help him to see if the sensor is really faulty:
There might be a good reason why we come accrosse relatively high amount of Dual Cath Dräger sensor complaints not only from you.
We found out due to market research that hospital staff is not aware to a great extent how to handle especially this type of sensor when they take it out from the machine for various reasons.
When you look at the sensor you found a small foam pouch connected to the golden rings of the sensor. The surface of the foam is graphite mixture. This graphite layer should be connected at all times
to the golden rings of the sensor in order to have a constant short circuit situation of the sensor . This short circuit protects the sensor from too long warm up times when installed in the machine again and incorrect first time calibration. When the sensor is built in the machine there this is done by the machine.
What we found of basically most of the Dual Cath Sensors is that after some time being in ambient air and calibration the sensor works fine again.
Therefore instruct the personnel that once they take out the sensor from the machine the foam piece should be connected with grey graphite surface to the gold rings of the sensor.
By the way this is for all Dual Cath sensors the same due to their production principle.
And one more change:
In the near future we will change our outer packaging from plastic to aluminium cans.