Process Instrumentation
P1 batch 3: knife gate valves, water storage tanks, water wells, cathodic protection and instrumentation cable now owned; bare-text mentions re-pointed to the new standards
Showing changes from Rev 5
to Rev 6
in Process Instrumentation.
---
title: Process Instrumentation
category: Instrumentation & Controls / Field Instrumentation
toc_depth: 3
description: >
− When to use: Field-mounted measurement instruments and transmitters for the core process variables pressure, level, and temperature, and for general-purpose process measurement, on industrial, process, and water/wastewater (WTP/WWTP) projects. Covers gauge, absolute, and differential pressure transmitters; hydrostatic, radar (non-contact and guided-wave), ultrasonic, and float level instruments; RTD and thermocouple temperature elements with thermowells and transmitters; signal and output types (4-20 mA with HART, and digital fieldbus options); accuracy and turndown; wetted materials and process connections; ambient and hazardous-area (Class/Division and Zone, intrinsic safety) ratings; local indication; and instrument tagging and loop identification per ANSI/ISA-5.1. Reference loop integration to [[sync/control-systems-integration]] and signal wiring to [[sync/conductors-and-cables]].
+ When to use: Field-mounted measurement instruments and transmitters for the core process variables pressure, level, and temperature, and for general-purpose process measurement, on industrial, process, and water/wastewater (WTP/WWTP) projects. Covers gauge, absolute, and differential pressure transmitters; hydrostatic, radar (non-contact and guided-wave), ultrasonic, and float level instruments; RTD and thermocouple temperature elements with thermowells and transmitters; signal and output types (4-20 mA with HART, and digital fieldbus options); accuracy and turndown; wetted materials and process connections; ambient and hazardous-area (Class/Division and Zone, intrinsic safety) ratings; local indication; and instrument tagging and loop identification per ANSI/ISA-5.1. Reference loop integration to [[sync/control-systems-integration]] and signal wiring to [[sync/instrumentation-and-control-cable]].
Not intended for: Flow rate and totalized flow measurement (magnetic, Coriolis, vortex, differential-pressure flow, ultrasonic flow) — see [[sync/flow-measurement]]. Water-quality and analytical measurement (pH, ORP, conductivity, dissolved oxygen, turbidity, chlorine) — see [[sync/analytical-instrumentation]]. Ambient gas detection — see [[sync/gas-detection-systems]]. Final control elements and the devices that move the process (control valves, actuators, positioners) — see [[sync/control-valves-and-actuators]]. The controller and logic solver that receives these signals ([[sync/programmable-logic-controllers]]); the operator interface and supervisory layer ([[sync/scada-and-hmi-systems]]); the control panels that house I/O and power supplies ([[sync/industrial-control-panels]]); and the field network infrastructure ([[sync/process-control-networks]]).
…7 unchanged lines
## The boundary of work under this standard is the field instrument itself, from the process connection (the tap, thermowell, or nozzle at the pipe or vessel) through the transmitter signal-output terminals. {note}
−## The signal wiring downstream of the instrument terminals is covered by [[sync/conductors-and-cables]], and the loop's termination, power, and I/O assignment by [[sync/control-systems-integration]]. {note}
+## The signal wiring downstream of the instrument terminals is covered by [[sync/instrumentation-and-control-cable]], and the loop's termination, power, and I/O assignment by [[sync/control-systems-integration]]. {note}
## The measured process variable, its range, and the instrument location are determined by the contract drawings and the instrument index. {note}
…674 unchanged lines
## Electrical Connection and Grounding {toc}
−### Signal wiring shall be installed per [[sync/conductors-and-cables]], using twisted shielded pair for analog and fieldbus signals, with the shield grounded at one end only (typically at the control system) to prevent ground-loop current.
+### Signal wiring shall be installed per [[sync/instrumentation-and-control-cable]], which governs the cable construction, the shield, and where the shield is grounded.
### Instrument grounding and bonding shall conform to [[sync/grounding-and-bonding]], and conduit and raceway to [[sync/raceways-and-conduit]].
…58 unchanged lines
### The spare-parts list with manufacturer part numbers shall be included in the closeout documentation.