What device is installed during a propane pressure test at the refrigerator?

The device that is installed during a propane pressure test at the refrigerator is a manometer. A manometer is specifically designed to measure the pressure of gases, including propane. In the context of a propane system, it accurately gauges the pressure levels, which is essential for ensuring the system operates within the safe and efficient parameters set by safety regulations.

Using a manometer allows technicians to identify any potential pressure issues within the propane lines connected to the refrigerator. This is crucial for maintaining the proper functioning of propane appliances and for safety checks, as improper pressure levels can lead to malfunctions or hazardous situations.

In this scenario, other devices listed do have their applications but are not suitable for measuring the pressure of a gas in the same way as a manometer. A pressure gauge, while related, can be less precise for specific gas measurements compared to a manometer. Thermometers measure temperature rather than pressure, and flow meters are designed to gauge the flow of gases or liquids rather than their pressure.