*D

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

D: Digital / Differential / Drain (context dependent)
DA: Data Acquisition / Differential Alarm
DAC: Digital-to-Analog Converter
DAE: Data Acquisition Equipment
DAM: Data Acquisition Module
DAP: Differential Alarm Pressure
DAS: Data Acquisition System
DAT: Data Analyzer Transmitter
DB: Dead Band / Database / Double Block
DBB: Double Block and Bleed
DBC: Dead Band Controller
DBD: Double Block Device
DBP: Differential Back Pressure
DC: Direct Current
DCA: Data Concentrator Assembly
DCC: Digital Control Cabinet
DCI: Digital Control Interface
DCM: Digital Control Module
DCS: Distributed Control System
DCT: Digital Control Transmitter
DD: Drain Device / Differential Device
DDD: Digital Display Device
DDP: Differential Design Pressure
DE: Differential Element / Drive End
DEA: Differential Element Assembly
DEM: Demand
DF: Draft Fan / Differential Flow
DFC: Differential Flow Controller
DFD: Data Flow Diagram
DFM: Digital Flow Meter
DG: Differential Gauge
DGA: Dissolved Gas Analysis
DGM: Digital Gauge Meter
DH: Differential Head
DHP: Differential Head Pressure
DI: Digital Input / Differential Indicator
DIC: Digital Input Card
DIF: Differential
DIM: Digital Input Module
DIN: Deutsches Institut für Normung / Digital Input
DIP: Dual In-line Package / Differential Pressure
DIR: Direction
DIS: Discrete Input System
DL: Dead Level / Data Logger
DLC: Data Logging Controller
DLI: Differential Level Indicator
DLT: Differential Level Transmitter
DM: Digital Meter / Density Meter
DMC: Digital Motor Controller
DMP: Differential Measurement Point
DN: Diameter Nominal
DO: Digital Output / Dissolved Oxygen
DOC: Digital Output Card
DOD: Depth of Discharge
DP: Differential Pressure / Dew Point
DPC: Differential Pressure Controller
DPD: Differential Pressure Detector
DPI: Differential Pressure Indicator
DPL: Differential Pressure Level
DPS: Differential Pressure Switch
DPT: Differential Pressure Transmitter
DR: Drain / Data Recorder
DRC: Data Recorder Controller
DRI: Data Recorder Indicator
DRM: Data Recording Module
DS: Drain System / Disconnect Switch
DSC: Digital Signal Converter
DSD: Digital Shutdown Device
DSI: Digital Status Indicator
DSM: Digital Signal Module
DSS: Decision Support System
DT: Digital Transmitter / Drain Trap
DTC: Digital Temperature Controller
DTD: Digital Trip Device
DTS: Distributed Temperature Sensing
DU: Display Unit
DVC: Digital Valve Controller
DVM: Digital Voltmeter
DW: Drain Water
DWP: Dew Point
DX: Direct Expansion
DZ: Dead Zone