What precaution should be in place to prevent liquid from going through indirect vaporizers?

The correct precaution to prevent liquid from going through indirect vaporizers is the implementation of an automatic prevention method. This is because indirect vaporizers are designed to convert liquid propane into gas safely and efficiently. The presence of liquid in the vaporization process can lead to malfunctions or potentially hazardous situations.

An automatic prevention method is crucial as it continuously monitors the conditions and adjusts the flow of propane accordingly. This ensures that any liquid that might accidentally enter the vaporizer is effectively diverted or managed before it can cause issues. This system operates without manual intervention, enhancing safety and reliability during operations.

While other options, such as temperature sensors and manual cutoffs, are helpful in monitoring and controlling the system, they do not provide the same level of proactive protection as an automatic prevention method. These alternatives might require timely human action or might not address all potential risks in real-time, whereas an automatic system offers a continuous safeguard.