Gravity Gas sensors: Preserving calibration

We are building a unit which will use a number (4 so far) of the Gravity gas sensors (SEN0466, SEN0467, SEN0469, SEN0471).

 

We have no calibration equipment, so the factory calibration constants are precious.

 

1) The FAQ mentions a Calibrate operation. Is there something which describes this operation, so we can avoid doing it (even by accident)?2) Supposing we eventually fail with (1), is there a way to read out the calibration constants so we can restore them in case of a mishap?

 

Thanks.