Unit 1 Test 1 Study Flash Cards Instruments.docx

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Front  ------------------------ ------------------------ ------------------------       Back +-----------------------+-----------------------+-----------------------+ | Float | Sight Glass | D/P Cell | | | | | | Measures level, | Measures level and | Measures level by | | hollow ball that | contains process in | taking the | | rises at surface. 2 | glass. Serves as a | differential | | position. | window into the | pressure. The bottom | | | process. | is smaller than the | | | | transmitter version. | +=======================+=======================+=======================+ | Displacer | Orifice | Venturi | | | | | | Measures level by | Flow measurement. | Used in low flow | | taking the | Bevel faces | measurement and gives | | differential | downstream, as the | you the most accurate | | pressure. As the | volume goes up the | reading. Displacement | | level moves up it | pressure goes down. | is smooth. Creates | | displaces the arm | Ex. Like putting | pressure drop but | | (buoyancy). | finger over end of a | minimizes pressure | | | garden hose. | loss. | +-----------------------+-----------------------+-----------------------+ | Rotameter | Thermometer | Thermocouple, RTD, | | | | and Thermocouple | | Measures small flow | Most common type is | produce an output | | and works with | J. | signal in millivolts. | | gravity. Common in | | Thermo-well | | seal pumps and | | | | analyzers. Example | | Measure temperature. | | seal flush. | | The RTD measures in | | | | ohms while the | | | | hermos-well is the | | | | protective device. | +-----------------------+-----------------------+-----------------------+ | Pyrometer | Infrared | Pressure Gauge | | | | | | Portable handheld | Measures only above | Local analog pressure | | thermometer. Portable | absolute temperature | measurement that can | | thermocouple. | zero and can only | have one of three | | | measure the surface | devices inside: | | | of liquids and can | bourdon tape, bellows | | | only read within | (accordion) and | | | 100ft. Usually used | diaphragm (corrosive | | | to measure temp or | or viscous material). | | | rotating equipment. | | +-----------------------+-----------------------+-----------------------+ | Pressure Transmitter | Delta P Transmitter | Manometer | | | | | | Pneumatic electronic | Most common in float | Found on furnaces and | | digital that controls | and level, high in | want it slightly | | | and low out. | negative on furnace | | | | or blower side. | | | | Oldest type of | | | | measuring devices | | | | used today. | +-----------------------+-----------------------+-----------------------+ Back Adjusted +-----------------------+-----------------------+-----------------------+ | D/P Cell | Sight Glass | Float | | | | | | Measures level by | Measures level and | Measures level, | | taking the | contains process in | hollow ball that | | differential | glass. Serves as a | rises at surface. 2 | | pressure. The bottom | window into the | position. | | is smaller than the | process. | | | transmitter version. | | | +=======================+=======================+=======================+ | Venturi | Orifice | Displacer | | | | | | Used in low flow | Flow measurement. | Measures level by | | measurement and gives | Bevel faces | taking the | | you the most accurate | downstream, as the | differential | | reading. Displacement | volume goes up the | pressure. As the | | is smooth. Creates | pressure goes down. | level moves up it | | pressure drop but | Ex. Like putting | displaces the arm | | minimizes pressure | finger over end of a | (buoyancy). | | loss. | garden hose. | | +-----------------------+-----------------------+-----------------------+ | Thermocouple, RTD, | Thermometer | Rotameter | | and Thermocouple | | | | | Most common type is | Measures small flow | | Thermocouple produce | J. | and works with | | an output signal in | | gravity. Common in | | millivolts. | | seal pumps and | | Thermo-well | | analyzers. Example | | | | seal flush. | | Measure temperature. | | | | The RTD measures in | | | | ohms while the | | | | thermo-well is the | | | | protective device. | | | +-----------------------+-----------------------+-----------------------+ | Pressure Gauge | Infrared | Pyrometer | | | | | | Local analog pressure | Measures only above | Portable handheld | | measurement that can | absolute temperature | thermometer. Portable | | have one of three | zero and can only | thermocouple. | | devices inside: | measure the surface | | | bourdon tape, bellows | of liquids and can | | | (accordion) and | only read within | | | diaphragm (corrosive | 100ft. Usually used | | | or viscous material). | to measure temp or | | | | rotating equipment. | | +-----------------------+-----------------------+-----------------------+ | Manometer | Delta P Transmitter | Pressure Transmitter | | | | | | Found on furnaces and | Most common in float | Pneumatic electronic | | want it slightly | and level, high in | digital that controls | | negative on furnace | and low out. | | | or blower side. | | | | Oldest type of | | | | measuring devices | | | | used today. | | | +-----------------------+-----------------------+-----------------------+