tailieunhanh - flame safeguard control phần 10

đạt đến một tốc độ quy định. Chuyển đổi có thể được sử dụng trong đường hoặc các mạch điện áp thấp. Chuyển mạch Honeywell buồm có sẵn để sử dụng trong các hệ thống tên bảo vệ an toàn được liệt kê trong Bảng VI al cuối của giây Để biết thêm chi tiết, tham khảo fa-các chỉ thị tion tờ tor các thiết bị chuyển mạch cánh buồm. | eiẩOSSÃRM a ABSOLUTE PRESSURE lhe sum of gauge pressure plus atmospheric pressure. Absolute pressure can be zero only in a perfect vacuum. actual body RATING-see VALVE BODY RATING. ACỊUATOR-a controlled motor relay or solenoid In which the electric energy is converted into a rotary linear or switching action. An actuator can effect a change in the controlled variable by operating the final control elements a number of times. Valves and dampers are examples of mechanisms which can be controlled by actuators. Also see PROPORTIONAL SPRING RETURN and TWO-POSITION ACTUATORS. AIR - the elastic invisible mixture of gases that surrounds the earth atmosphere. Also see AMBIENT ATOMIZING. COMBUSTION. COMPRESSED EXCESS. INDUCED PREHEATED PRIMARY SEAL SECONDARY AND VENTILATION AIR. AIR-ATOMIZING OIL BURNER-see ATOMIZING OIL BURNER. AIR CHANGE a complete replacement of all the air in the combustion chamber and breeching of a furnace or boiler. AIRFLOW SWITCH-a controller used to prove proper air movement through a combustion chamber by measuring windbox or breeching pressure or by measuring air velocity sail switch . Also see LOCKOUT and RUNNING INTERLOCKS. . Al R-FUEL RATIO the ratio of the weight or volume of air to fuel measured in the same units under the same conditions. The optimum air-fuel ratio is the minimum ratio that will provide complete combustion of the fuel with enough excess air to maintain a stable flame envelope. Also see STOICHIOMETRIC AIR-FUEL RATIO. AIR HEATER an Indirect-fl red. vented appliance intended to supply heated air for space heating and other purposes but not Intended for permanent installation. AIR REGISTER a burner mounting which may admit secondary air to the combustion space. AIR RICH-the air-fuel ratio supplied to a furnace that provides more air than the optimum ratio. AIR SHUTTER-an adjustable device for varying the size of the air Inlet or inlets regulating primary and or secondary air. An air shutter may be automatically or manually .