Ultralow-Pressure Sensors

Ultralow-pressure sensors are useful in detecting extreme low-pressure readings. e.g., when a small fan is used to exhaust gas from a small industrial furnace, the total amount of pressure is usually less than 1 psi above atmospheric pressure. The sensor to measure this low pressure usually uses a rubber diaphragm that is very sensitive. it's important that the total maximum pressure level is never exceeded or the sensor will be permanently damaged. Other very low pressures are used to set the amount of gas pressure in a regulator where natural gas or propane gas is used to heat a process oven. The total pressure of this gas must be approximately 10 inches of water column, which is about 0.36 psi. This small amount of pressure can't be accurately measured with a traditional sensor, so the ultra low-pressure sensor or a U-tube manometer that is filled with water or mercury must be used.

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