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.
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An instrument panel dedicated to a particular system.

A detector intended to detect temperature.

A detecting element intended to sense temperature.

A gauge that is intended to measure and indicate a temperature.

A physical object that detects temperatures; records, modifies and/or displays or performs a combination of these activities.

A regulator that is intended to keep a temperature within certain boundaries.

A functional switch that is intended to give an on or off signal when the temperature have reached a pre-set value.

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

An analysing instrument that is intended to determine a physical property that is named thermal conductivity.

An element which uses the principle of thermal conductivity to measure volume flow rate.

A velocity flow meter which uses the principle of thermal conductivity to measure volume flow rate.

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A pair of electrical conductors of dissimilar materials, joined at one end (the measuring or hot junction), which produces an electromotive force (e.m.f.) due to the Seebeck effect in a circuit formed by connecting the other ends of the dissimilar materials used (the reference or cold junction) to a device for measuring e.m.f. Def. acc. to IEC 902 1987.

tag class

A physical object that is a pressure-tight receptacle adapted to receive a temperature sensing element, provided with external threads or other means for pressure-tight attachment to a vessel or pipe.

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A timepiece that measures a time interval and signals its end; a time-switch.

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A physical object that is an element that receives a process variable signal from a sensor and converts it into an output signal.

A pilot switch intended to create a switch action at a pre-set value.

A velocity flow meter that uses a multi bladed rotor to measure fluid flow rate in units of volumetric flow through a closed conduit.

A transmitter specially designed to convert the signal in a turbine meter into a standardized output signal.

A velocity flow meter that measures the velocity of a flow by measuring the time difference between an ultrasonic pulse sent in the flow direction and an ultrasound pulse sent opposite the flow direction.

A flow transmitter providing electrical outputs that are proportional to the flow inputs from an ultrasonic flow meter.

An element intended to determine a level based on ultrasonic sound waves.

A level transmitter that is using ultrasonic sound to continuously monitor the level of a liquid or particulate matter in a tank or vessel.

A differential pressure flow meter that uses a v-cone as the restriction body in the flow stream.

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A fluid regulator that can be used to control (i.e. permit, obstruct, regulate or divert) a fluid stream.

An analyser intended to determine a vapor pressure.

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.