*X

Here’s a list of Instrumentation abbreviations starting with the letter “X”, commonly used in P&IDs, datasheets, control systems, and field instrumentation.

X: Exchanger / Transducer / Auxiliary (context dependent)
XA: Exchanger Alarm / Auxiliary Alarm
XAC: Exchanger Alarm Controller / Auxiliary Alarm Controller
XAM: Exchanger Alarm Module / Auxiliary Alarm Module
XB: Exchanger Bus / Auxiliary Bus
XBC: Exchanger Bus Controller / Auxiliary Bus Controller
XC: Exchanger Controller / Auxiliary Controller
XCA: Exchanger Control Assembly / Auxiliary Control Assembly
XCC: Exchanger Control Cabinet / Auxiliary Control Cabinet
XCD: Exchanger Control Device / Auxiliary Control Device
XCM: Exchanger Control Module / Auxiliary Control Module
XCP: Exchanger Control Panel / Auxiliary Control Panel
XCS: Exchanger Control System / Auxiliary Control System
XD: Exchanger Device / Auxiliary Device
XDC: Exchanger Device Controller / Auxiliary Device Controller
XDD: Exchanger Detection Device / Auxiliary Detection Device
XE: Exchanger Element / Auxiliary Element
XF: Exchanger Flow / Auxiliary Flow / Filter
XFC: Exchanger Flow Controller / Auxiliary Flow Controller
XFD: Exchanger Flow Device / Auxiliary Flow Device
XFM: Exchanger Flow Meter / Auxiliary Flow Meter
XG: Exchanger Gauge / Auxiliary Gauge
XH: Exchanger High / Auxiliary High
XI: Exchanger Indicator / Auxiliary Indicator
XIC: Exchanger Indicating Controller / Auxiliary Indicating Controller
XIM: Exchanger Interface Module / Auxiliary Interface Module
XL: Exchanger Low / Auxiliary Low
XLA: Exchanger Low Alarm / Auxiliary Low Alarm
XLC: Exchanger Low Controller / Auxiliary Low Controller
XLD: Exchanger Low Device / Auxiliary Low Device
XLI: Exchanger Low Indicator / Auxiliary Low Indicator
XLT: Exchanger Low Transmitter / Auxiliary Low Transmitter
XM: Exchanger Module / Auxiliary Module
XMC: Exchanger Module Controller / Auxiliary Module Controller
XN: Exchanger Node / Auxiliary Node
XO: Exchanger Output / Auxiliary Output
XOC: Exchanger Output Controller / Auxiliary Output Controller
XOM: Exchanger Output Module / Auxiliary Output Module
XP: Exchanger Point / Auxiliary Point
XPC: Exchanger Point Controller / Auxiliary Point Controller
XPD: Exchanger Pressure Device / Auxiliary Pressure Device
XPI: Exchanger Pressure Indicator / Auxiliary Pressure Indicator
XPT: Exchanger Pressure Transmitter / Auxiliary Pressure Transmitter
XR: Exchanger Recorder / Auxiliary Relay
XRC: Exchanger Recorder Controller / Auxiliary Relay Controller
XRD: Exchanger Relay Device / Auxiliary Relay Device
XS: Exchanger Switch / Auxiliary Switch
XSC: Exchanger Switch Controller / Auxiliary Switch Controller
XSD: Exchanger Shutdown Device / Auxiliary Shutdown Device
XSI: Exchanger Status Indicator / Auxiliary Status Indicator
XSM: Exchanger Signal Module / Auxiliary Signal Module
XT: Exchanger Transmitter / Auxiliary Transmitter
XTC: Exchanger Temperature Controller / Auxiliary Temperature Controller
XTD: Exchanger Trip Device / Auxiliary Trip Device
XTI: Exchanger Temperature Indicator / Auxiliary Temperature Indicator
XTT: Exchanger Temperature Transmitter / Auxiliary Temperature Transmitter
XV: Exchanger Valve / Auxiliary Valve
XVC: Exchanger Valve Controller / Auxiliary Valve Controller
XVM: Exchanger Valve Module / Auxiliary Valve Module