Final answer:
The manifold gauge is used to measure and indicate the pressure in a system, such as the pressure in an air conditioning system or a refrigeration system. It consists of two pressure gauges, one for high pressure and one for low pressure, as well as valves and hoses for connecting to the system. The gauges are calibrated to zero when the pressure is known to be atmospheric pressure.
Step-by-step explanation:
The manifold gauge is used to measure and indicate the pressure in a system, such as the pressure in an air conditioning system or a refrigeration system. It consists of two pressure gauges, one for high pressure and one for low pressure, as well as valves and hoses for connecting to the system. The high-pressure gauge measures the pressure of the refrigerant when it is compressed, while the low-pressure gauge measures the pressure of the refrigerant when it is expanded.
The manifold gauge is calibrated by setting the gauges to zero when the pressure is known to be atmospheric pressure. This can be done by connecting the hoses of the gauge to an open container and adjusting the gauge readings to match atmospheric pressure. Once the gauges are calibrated, they can be used to measure the pressure in a closed system and provide accurate readings.