*G

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

G: Gas / Gauge / Ground (context dependent)
GA: Gas Analyzer / Gas Alarm
GAC: Gas Analyzer Controller
GAD: Gas Analyzer Detector
GAF: Gas Analyzer Filter
GAL: Gas Alarm Low
GAM: Gas Analyzer Module
GAP: Gas Analyzer Panel
GAS: Gas
GB: Gear Box / Ground Bus
GBC: Gas Booster Compressor
GBD: Gas Blowdown
GBV: Gas Block Valve
GC: Gas Chromatograph / Ground Connection
GCA: Gas Chromatograph Analyzer
GCC: Gas Control Cabinet
GCD: Gas Chromatograph Detector
GCM: Gas Control Module
GCP: Gas Control Panel
GCS: Gas Control System
GD: Gas Detector
GDC: Gas Detection Controller
GDD: Gas Detection Device
GDS: Gas Detection System
GE: Ground Earth
GF: Ground Fault / Gas Filter
GFC: Ground Fault Circuit
GFDS: Gas & Fire Detection System
GG: Gauge Glass
GGI: Gauge Glass Indicator
GH: Gas Heater
GHC: Gas Heater Controller
GI: Gas Indicator
GIC: Gas Indicating Controller
GIM: Gas Interface Module
GL: Gauge Level / Ground Loop
GLA: Gauge Level Alarm
GLC: Gauge Level Controller
GLI: Gauge Level Indicator
GLT: Gauge Level Transmitter
GM: Gas Meter
GMC: Gas Meter Controller
GMD: Gas Measuring Device
GN: Ground Neutral
GO: Gas Outlet
GOV: Governor
GP: Gauge Pressure / Gas Panel
GPC: Gas Pressure Controller
GPI: Gauge Pressure Indicator
GPM: Gallons per Minute
GPR: Gas Pressure Regulator
GR: Gas Regulator / Ground
GRC: Gas Regulating Controller
GRD: Ground
GRP: Gas Reduction Panel
GS: Gas Switch
GSC: Gas Safety Controller
GSD: Gas Shutdown Device
GSI: Gas Status Indicator
GSM: Gas Sensing Module
GT: Gas Turbine / Gas Transmitter
GTC: Gas Temperature Controller
GTD: Gas Trip Device
GU: Gas Utility
GV: Gate Valve / Gas Valve
GVC: Gas Valve Controller
GW: Ground Wire
GX: Gas Expansion