Instrument identification tag

• AIT: Analytical Indicator Transmitter (eg oxygen concentration analyzer with built-in display of oxygen percentage)
• ESL : Voltage switch, low (a switch used to detect under-voltage conditions in an electrical power system)
• FFI : Flow Ratio Indicator (a device that indicates the ratio between air and fuel for large industrial engines)
• FIC: Flow Indicating Controller (and is a controller designed to indicate flow to a human operator)
• HC: Hand controller (and is a device that allows a human operator to set a control signal to some desired level, usually to operate a valve or other final control element)
• JQR: Power totalizing recorder (eg watt-hour recorder, tracking total energy used)
• LSHH: level switch, high-high (for example, a level-sensing switch designed to detect dangerously high liquid levels and initiate an automatic shutdown in that event)
• LT: Level Transmitter (and is a device that detects liquid level and reports that level in some analog or digital form)
• PIT: Pressure Indicating Transmitter (example Rosemount Model 3051 Pressure Transmitter with built-in display of measured pressure)
• PDT: Pressure Differential Transmitter (and is a pressure transmitter designed and installed to sense the pressure difference between two points in a fluid system)
• PV: Pressure valve (and is a control valve installed in a loop where the process has variable pressure)
• TE: Temperature element (and is a sensing element used to directly detect the temperature of the process material; e.g. thermocouple, thermistor, field-bulb, bimetallic spring)
• TKAH : Temperature Change Alarm, High (and is an alarm device when the rate of temperature change exceeds a pre-set limit)
• TV : Temperature valve (and there is a control valve installed in the loop where the process changes temperature)
• TY : Temperature Converter (Example of I/P Transducer in Temperature Loop)
• VSH : Vibration Switch, High (and is a switch used to detect high level vibration on a piece of machinery)
• ZXI, ZYI, and ZZI : Position indicators for the X, Y, and Z axes, respectively (three-axis position indicators for CNC machine tools).