Where must the pressure gauge be installed in LPG systems?

In LPG systems, the pressure gauge must be installed before the pressure regulator. This placement is crucial because it allows for monitoring the pressure of the gas coming directly from the tank before it passes through the regulator. By installing the gauge in this position, technicians can ascertain whether the pressure from the supply is within the appropriate range and ensure safe operation.

If the gauge were placed after the pressure regulator, it would reflect the reduced pressure that is regulated for delivery to appliances, which is important but not useful for assessing tank pressure. Therefore, the gauge's pre-regulator position is essential for safety checks and verifying proper function throughout the LPG system.