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
run regular simulated tests using TARP (testing of Applications Recovery Planes)
do not leave training manuals unsecured
do not allow unbonded service people to work on your equipment

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Automation System
A venturi tube:

can be used to measure gas or liquid flow rates
is extremely difficult to use
None of these
is made only of metal
measures the presence of a liquid

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