We have a natural gas well we drilled 31 years ago, it is just 
sufficient to heat the house including  the garage, a small greenhouse, 
hot water, kitchen, and clothes dryer. The PIC monitors the well head, 
and regulated pressures and the enclosure temperature. The gas has a 
water vapor dew point just below freezing, so it is important to know if 
the heat fails. The well is 1000 feet deep, with 180 feet of steel 
casing pipe, and the rest is bare hole. The PIC communicates via. fiber 
optic to RS-485 to a PLC that manages a standby generator. Items 
controlled with the PLC include changing the house heat from natural gas 
to electric resistance heat if the well pressure is low which might 
happen once or twice a year with having to pay for $30 electric. The 
generator can run gasoline, natural gas or propane (no tank at this 
time, but have tested) and switch under load automatically.

Jim Korman wrote:
> Carl Denk wrote:
>   
>> Controlled opening not good idea. The Enclosure is 200 feet from house, 
>> in the middle a mowed grass area. The only time needing to open the 
>> aluminum box (which accessible once the enclosure is removed) is if 
>> there is a problem with the PIC's board itself including the temperature 
>> sensor. The pressure sensors, and wall wart can all be unplugged from 
>> aluminum box mounted sockets. This could happen at any time (granted 
>> probably rarely)  day or night, sun, rain, or snow. And then I probably 
>> want to get things back together quickly and get back inside.
>>
>> Right now my game plan is to coat the boards, less the DIP socket tops 
>> with catalyzed clear urethane, make a little packet of silica gel, dry 
>> it, and put things back together.
>>   
>>     
> May I ask what pressure you are measuring?
>
> Jim
>   
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