TWP/AERI/C2 - Instrument maintenance, Sensor failure, hatch stuck

The rain sensors tell the hatch when to close so that the optical 
components are protected
                 from the weather.  When the rain sensors become either dirty or covered 
with salt spray, a 
                 hatch event is triggered. When dirty, they will give a low reading even 
when there is no rain.

                 Error flags also indicated the hatch was stuck in an intermediate 
position, neither open 
                 nor closed.  

                 The hatch closed under sunny conditions due to failure of the electronics 
of the hatch. No 
                 atmospheric spectral data are produced under this condition, which is 
equivalent to a rain 
                 condition.

null
                 closed and only use data when the hatch was open.

• Rain sensor analog output(rainSensorIntensity)
• Boolean with negative error conditions: 1:Open 0:Closed -1:Fault -2:Outside
  Valid Range -3:Neither Open Nor Closed(hatchOpen)