*I

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

I: Indicator / Input / Instrument (context dependent)
IA: Instrument Air / Input Alarm
IAC: Instrument Air Controller / Input Alarm Controller
IAL: Input Alarm Low
IAH: Input Alarm High
IAM: Input Alarm Module
IB: Isolation Barrier / Input Block
IBC: Instrumentation Barrier Controller
IC: Indicating Controller / Instrument Cabinet
ICA: Indicating Controller Assembly
ICC: Instrument Control Cabinet
ICD: Instrument Control Device
ICM: Instrument Control Module
ICP: Instrument Control Panel
ICS: Instrument Control System
ID: Identification / Input Device
IDC: Instrument Data Converter / Input Data Controller
IDI: Input Device Indicator
IDM: Instrument Data Module
IDP: Input Device Point
IE: Instrument Enclosure / Input Element
IF: Input Filter / Interface
IFC: Input Filter Controller / Interface Controller
IFM: Input Flow Module / Instrument Flow Meter
IG: Instrument Gas / Ignition Gas
IHC: Instrument Heater Controller
IHV: Instrument Hand Valve
II: Input Indicator / Intelligent Instrument
IIC: Input Indicating Controller
IIM: Instrument Interface Module
IL: Instrument Level / Input Low
ILA: Instrument Level Alarm
ILC: Instrument Level Controller
ILI: Instrument Level Indicator
ILT: Instrument Level Transmitter
IM: Instrument Module / Interface Module
IMC: Instrumentation Module Controller
IMD: Instrument Module Device
IN: Input / Instrument Node
INC: Input Node Controller
IO: Input / Output
IOC: Input/Output Controller
IOM: Input/Output Module
IP: Instrument Panel / Input Point / Ingress Protection
IPC: Instrument Panel Controller
IPD: Input Pressure Device
IPI: Input Pressure Indicator
IPT: Input Pressure Transmitter
IR: Infrared / Instrument Relay
IRC: Instrument Relay Controller
IRP: Infrared Point / Instrument Relay Point
IS: Intrinsically Safe / Input Switch
ISC: Intrinsically Safe Controller
ISD: Intrinsically Safe Device
ISI: Instrument Status Indicator
ISM: Instrument Status Module
ISV: Instrument Solenoid Valve
IT: Instrument Transmitter / Information Technology
ITC: Instrument Temperature Controller
ITD: Instrument Trip Device
ITI: Instrument Temperature Indicator
ITT: Instrument Temperature Transmitter
IUC: Interface Unit Controller
IUI: Interface Unit Indicator
IV: Isolation Valve / Instrument Valve
IVC: Isolation Valve Controller
IVM: Instrument Valve Module