loop diagram

Document Type Information
Details and background about this document type.
Description
A diagram showing details all elements of a control loop, from sensing element through to controlling element, and cabling and wiring details for the associated instruments. Includes junction box, marshalling cabinet and control panel terminations and power supply details.
Synonyms
  • CFIHOS ID
    CFIHOS-70000205
Equipment
Equipment that requires this document type.

A mechanical controller that is using pneumatic components to execute its function.

A pilot switch the actuating system of which is operated by a moving part of a machine, when this part reaches a predetermined position.

A transmitter that is producing a standardized output signal dependent of a received input signal from a position detector.

Elements like impellers rotating by the pressure of the fluid in a closed conduit to measure the flow of a liquid.

A flow transmitter specially designed to convert the signal from a positive displacement flow meter into a standardized electrical output signal.

An analysing instrument intended to determine the pour point of a fluid, i.e. the lowest temperature at which an oil or other liquid will pour under given conditions.

A detecting element intended to sense pressure.

A gauge intended to measure and display a representation of a measured pressure.

A regulator that is controlling/regulating the pressure in a system.

A functional switch that (usually) turns an electrical circuit on or off when the pressure level reaches a pre-set value.

A signal converter that is intended to convert a pressure input signal to DC output signal.

A transmitter that is producing a standardized output signal dependent of a received input signal from a pressure element.

A detecting element that is intended to sense proximity.

A position switch that is operated without mechanical contact with the moving part.

tag class

A manual control switch that is intended to switch when you push or touch the button.

An element intended to determine a level based on high frequency electromagnetic waves.

A level transmitter that is producing a standardized electrical output signal based on the input signal from a radar type level sensor.

A personal radiation monitor is a device that detects the presence of any radiation sources.

A level transmitter that is producing a standardized electrical output signal based on the input signal from radioactive level measurements.

A process instrument that records values represented by the input signal(s).

An analyser intended to determine the oxidation and reduction capability of material.

tag class

A pressure transmitter where pressure is applied to one side of the sensor while the other side is open to atmosphere. The transmitter generate standardized output signal representing the measured value.

tag class

A physical object that can be any electrical device, usually incorporating an electromagnet, whereby a current or signal in one circuit can open or close another circuit.

A temperature sensing element that operate on the principle of changes in electrical resistance of pure metals (sintered semiconductor material) and are characterized by an almost linear positive change in resistance with temperature.

Registers
Registers where this document type is included.
A collection of all instrument set points and/or alarms. Each instrument having an alarm or trip function is listed. Alarms and settings are given as percentages of transmitter range and in engineering units, together with transmitter range, location of the annunciation point, cabinet, identification and relevant P&IDs/PEFS or logic drawing.
An authoritative collection of values with a relationship to instrumentation. The columns of this collection is specified and controlled.