*C

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

C: Controller / Celsius / Contact (context dependent)
CA: Control Alarm / Current Alarm
CAB: Cabinet
CAC: Cascade Controller
CAD: Computer-Aided Design
CAL: Calibration
CAM: Control Air Manifold
CAP: Capacity
CAR: Control Air Regulator
CAS: Control and Alarm System
CAT: Category
CAV: Control Air Valve
CB: Circuit Breaker / Control Block
CBC: Control Bias Controller
CBL: Cable
CBM: Condition-Based Monitoring
CBP: Common Bypass
CC: Control Cabinet / Closed Circuit
CCA: Control Circuit Alarm
CCC: Compressor Control Controller
CCD: Charge-Coupled Device
CCI: Control Circuit Indicator
CCL: Closed-Circuit Logic
CCM: Control/Command Module
CCR: Control Circuit Relay
CCS: Compressor Control System / Closed Control System
CD: Control Device
CDC: Control Data Concentrator
CDD: Control Delay Device
CDI: Capacitive Discharge Ignition
CDP: Critical Design Point
CE: Control Element
CEC: Centralized Equipment Control
CEL: Control Equipment Location
CEM: Continuous Emission Monitoring
CEMS: Continuous Emission Monitoring System
CET: Control Equipment Tag
CF: Control Function / Correction Factor
CFC: Control Flow Controller
CFD: Computational Fluid Dynamics
CFM: Cubic Feet per Minute
CG: Control Gas
CGC: Control Gas Controller
CGM: Control Gas Manifold
CH: Channel / Chemical Heater
CHP: Combined Heat and Power
CI: Control Indicator / Current Input
CIC: Control Indicator Controller
CID: Common Interface Device
CIM: Control Interface Module
CIR: Circuit
CIS: Control Interlock System
CK: Check
CKV: Check Valve
CL: Control Logic / Chlorine
CLC: Closed Loop Control
CLD: Control Logic Diagram
CLP: Closed Loop Process
CM: Control Module
CMC: Central Monitoring Controller
CMF: Coriolis Mass Flow
CMOS: Complementary Metal-Oxide Semiconductor
CMS: Condition Monitoring System
CN: Connector
CNC: Computer Numerical Control
CNP: Control Node Processor
CO: Carbon Monoxide / Control Output
COC: Controller Output Card
COD: Chemical Oxygen Demand
COM: Communication / Common
COP: Coefficient of Performance
COS: Change-Over Switch
CP: Control Panel / Control Point
CPC: Control Pressure Controller
CPD: Control Panel Door
CPE: Customer Premises Equipment
CPI: Corrosion Probe Indicator
CPU: Central Processing Unit
CQ: Control Quality
CR: Control Relay
CRC: Cyclic Redundancy Check
CRD: Control Relay Device
CS: Control Switch / Control System
CSC: Control Sequence Controller
CSD: Control Shutdown
CSF: Control Safety Function
CSL: Control Safety Logic
CSV: Control Solenoid Valve
CT: Current Transformer / Control Transmitter
CTC: Control Temperature Controller
CTD: Control Trip Device
CTS: Control Transfer Switch
CU: Control Unit
CUB: Cubicle
CV: Control Valve / Coefficient of Flow
CVC: Control Valve Controller
CVD: Chemical Vapor Deposition
CW: Cooling Water
CWP: Cooling Water Pump
CWT: Cooling Water Tower
CZ: Control Zone