Low differential pressure transmitters and low cost pressure sensor controller of LEFOO pressure control have a wide application for air-conditioning/ventilation, duct static pressure measurement, filter and flap control, airflow control, cleanroom control, Lab/Fume hood control, airflow control, VAV and fan control, smoke hood control, furnace airflow control, oven pressurization, fluid, level monitoring,  Isolation rooms monitoring, environmental protection, air blower, air cleaning or pneumatic feed lines. energy management systems.