Automation System
There are several procedures you can implement to provide maximum security. The most important of these is:

None of these
Verify the reputation of the people installing your system
do not allow unbonded service people to work on your equipment
run regular simulated tests using TARP (testing of Applications Recovery Planes)
do not leave training manuals unsecured

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Automation System
Pressure sensors:

use capacitive variations to sense pressure
None of these
use an aneroid chamber with a variable resistance output
All of these
use the piezoresistive effect in strain gauge sensors

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