*N

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

N: Nitrogen / Network / Normal (context dependent)
NA: Normal Alarm / Nitrogen Analyzer
NAC: Normal Alarm Controller / Nitrogen Analyzer Controller
NAM: Normal Alarm Module
NB: Network Bus / Normal Block
NBC: Network Bus Controller
NC: Normally Closed / Network Controller
NCA: Network Control Assembly
NCC: Network Control Cabinet
NCD: Network Control Device
NCM: Network Control Module
NCP: Network Control Panel
NCS: Network Control System
ND: Nitrogen Detector / Network Device
NDC: Nitrogen Detector Controller / Network Device Controller
NDD: Nitrogen Detection Device / Network Device Device
NDS: Network Detection System
NE: Network Element / Nitrogen Element
NF: Network Filter / Nitrogen Filter
NG: Natural Gas / Network Ground
NH: Nitrogen Heater / Normal High
NI: Network Indicator / Nitrogen Indicator
NIC: Network Indicating Controller
NIM: Network Interface Module
NL: Normal Level / Network Level
NLA: Normal Level Alarm
NLC: Normal Level Controller
NLI: Normal Level Indicator
NLT: Normal Level Transmitter
NM: Network Module / Nitrogen Module
NMC: Network Module Controller
NN: Network Node / Nitrogen Node
NO: Normally Open / Network Output
NOC: Network Output Controller
NOM: Network Output Module
NP: Network Point / Nitrogen Point
NPC: Network Point Controller
NPD: Nitrogen Pressure Device / Network Pressure Device
NPI: Nitrogen Pressure Indicator / Network Pressure Indicator
NPT: Nitrogen Pressure Transmitter / Network Pressure Transmitter
NR: Network Recorder / Nitrogen Relay
NRC: Network Recorder Controller / Nitrogen Relay Controller
NRD: Network Relay Device
NS: Network Switch / Nitrogen Switch
NSC: Network Switch Controller
NSD: Network Shutdown Device
NSI: Network Status Indicator
NSM: Network Signal Module
NT: Network Transmitter / Nitrogen Transmitter
NTC: Network Temperature Controller / Nitrogen Temperature Controller
NTD: Network Trip Device / Nitrogen Trip Device
NTI: Network Temperature Indicator
NTT: Network Temperature Transmitter
NV: Network Valve / Nitrogen Valve
NVC: Network Valve Controller / Nitrogen Valve Controller
NVM: Network Valve Module