International Standard @) 3511/2 0 a 4 4g& INTERNATIONAL ORGAN,ZAT,ON ~ORSTANDARDIZATION~ME~~YHAPO~HAfl OPrAHH3AUMR nOCTAH,lAPTM3A,,W, ORGANISATION INTERNATIONALE DE NORMALISATION Process measurement[.]
0 International Standard @) 3511/2 a4g& INTERNATIONAL ORGAN,ZAT,ON ~ORSTANDARDIZATION~ME~~YHAPO~HAfl OPrAHH3AUMR nOCTAH,lAPTM3A,,W,-ORGANISATION INTERNATIONALE DE NORMALISATION `,,,,,`,```,,`,,`,```,,,````,`-`-`,,`,,`,`,,` - Process measurement control functions and - Symbolic representation instrumentation Part 2: Extension of basic requirements Fonctions et instrumentation pour la mesure Partie 2: Extension des principes de base First edition G3 i UDC Descriptors - et la rkgulation des processus industriels - Reprksentation - 1964-07-01 Ref No 744.43 : 62-52 : 003.62 : technical symbolique drawing, graphic symbols, measuring instrument, control devices, adjusting IS0 3511/2-19&l f E) systems r*l Price based on pages Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies) The work of developing International Standards is carried out through IS0 technical committees Every member body interested in a subject for which a technical committee has been authorized has the right to be represented on that committee International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work Draft International Standards adopted the member bodies for approval before the IS0 Council committees are circulated as International Standards to by International Standard IS0 3511/2 was developed by Technical Committee ISO/TC Technical drawings, and was circulated to the member bodies in May 1963 10, It has been approved by the member Australia Austria Belgium Brazil Czechoslovakia Germany, F.R No member body expressed by the technical their acceptance bodies of the following India Italy Japan Netherlands Norway Poland disapproval countries: Sweden Switzerland United Kingdom USA USSR of the document This part of IS0 3511 was developed by sub-committee 3, Graphicalsymbols forinstrumentation The symbols are intended to be used to represent functions and, in special cases, equipment on technical drawings such as schematic diagrams or process flowdiagrams However, this field of engineering is closely related to electrical instrumentation dealt with by IEC/TC 65 or in part by IECYSC 3A For this reason there has been close coordination in a joint working group and the results were accepted by members of IS0 and IEC `,,,,,`,```,,`,,`,```,,,````,`-`-`,,`,,`,`,,` - International Printed Organization in Switzerland for Standardization, 1984 l INTERNATIONAL IS0 3!511/2-1984 STANDARD (E) Process measurement control functions and - Symbolic representation instrumentation Part 2: Extension of basic requirements Introduction The symbols are used on piping and engineering line diagrams This International Standard has been devised to provide a universal means of communication among the various interests involved in the design, manufacture, installation and operation of measurement and control equipment used in the process industries Requirements within the industries recognition of this, this International four parts, as follows: vary considerably; Standard is presented of basic requirements Part 3: Detailed diagrams symbols Part 4: Basic symbols shared display/control The four parts together instrument for process computer, functions 1) are intended interconnection interface, and The definitions IS0 3511 of application This part of IS0 3511 is an extension of part 1, which to identification of instrument functions is lirnited At present at the stage definition apply to this part of also applies: Examples : Where a direct-connected pressure transmitter has an integral pressure-sensitive element, the combined element and transmitter assembly shall be tagged PT Where an external pressure cell is connected to a transmitter, the pressure cell shall be tagged PE and the transmitter shall be tagged PT Letter code Identifying letters The function of the instrument included within the instrument 4.2 This part of IS0 3511 includes additional symbols and is intended for the communication of measurement and control functions among instrument specialists and other engineers involved with vessels, piping, layout design and operation 1) given in IS0 3511/ equally 3.1 sensing element: That part of an instrument loop that first senses the value of a process variable and that assumes a predetermined and intelligible state or output 4.1 and field sym- NOTE - The sensing element may be separate from or integral with another functional element of a loop, but should be given an individual tag number only if it is separate to: b) provide standard symbolic representation for process measurement control functions and instrumentation These symbols are not intended to replace graphical symbols for electrical equipment as contained in IEC Publication 117 Scope graphical Definitions The following a) meet the requirements of those who, possibly employing more sophisticated measurement and control means, may wish to depict such aspects as the measurement techniques embodied in a particular instrument, or the means - hydraulic, pneumatic, electrical, mechanical used for its actuation; Reference IEC 117-15, Recommended graphical symbols; bols - Part 15: Binary logic elements Part 2: Extension diagrams in in Part : Basic requirements (directed towards the needs of those employing comparatively simple measurements and control means) for and instrumentation Basis for the letter shall be defined symbol circle by a letter code code The letter code is built up similarly to the letter code for basic symbols given in IS0 3511/l but the table extends the letters available for use of draft IS0 3511/2-1994 (E) Table - Letter code for identification NOTE - Entries in normal type are identical with the entries in the table of IS0 of instrument 3511i Entries functions in italics the supplementary integrating or summating symbols `,,,,,`,```,,`,,`,```,,,````,`-`-`,,`,,`,`,,` - indicate Integrate or totalize ultifunction unit uvre, element, W Weight X Unclassified Y User’s actua tlng correcting or force variables31 choices] A note shall be added Unclassified functions cathode-ray tube) Computing I I I upper case lerters snail De usea for tne measured or rnmatrng variable and succeeding letters preferred for modifiers, but lower case letters may be used if this facilitates understanding 2) unspecified to specify the property Emergency for display or output relay, (for example relay or safety acting function Upper case letters are measured, 3) Where a user has a requirement for measured or initiating variables to which letters have not been allocated and are required for repetitive use on a particular contract, the letters allocated to “User’s Choice” may be used provided that they are identified or defined for a particular measured or initiating variable and reserved for that variable Where a user has a requirement for a measured or initiating variable that may be used either once or to a limited extent, the letter X may be used provided that it is suitably identified or defined 4) The letter U may be used instead NOTE - Where it is necessary ters may be used, for example of a series of first letters where a multiplicity of inputs representing dissimilar variables feed into a single to denote HIGH or LOW, the qualifying letters H or L may be used in association with the instrument symbol for deviation, for rate of change, but these shall be defined on the drawing rather than in the table unit Other let- IS0 3511/2-19&I Instrument 5.1 Electrical 5.2 Pneumatic signal lines (A) Hydraulic Nozzle 6.1.4 Variable area meter 6.1.5 Turbine meter 6.1.6 Volume meter (L) I L Capillary ” A V 5.5 6.1.3 tube A I\ I L 5.4 Venturi (El h I, 5.3 6.1.2 `,,,,,`,```,,`,,`,```,,,````,`-`-`,,`,,`,`,,` - Conducted radiation (radio waves, Primary elements, correcting and actuating elements visible light) 6.1.1 Flow Orifice primary general Y FQ elements 6.1.7 plate - elements, NOTE - In cases where it is necessary to use detail symbols in functional diagrams the symbols should be as given In IS0 3511!3, slmplifying if possible Examples are as follows 6.1 (E) Any other flow primary element [I F 3511/2-19&l 6.2 Level 6.2.1 (E) instrument Integrally 6.2.6 connections mounted instrument, for example Level control valve - mechanical linkage welded-on `,,,,,`,```,,`,,`,```,,,````,`-`-`,,`,,`,`,,` - IS0 tvw P 6.2.2 Instrument float type 6.2.3 instrument displacer type 6.2.4 with single connection, with two connections, Tank gauge-float 6.3 for example for example internal Tank gauge-float self-actuated Pressure regulator with internal tap 6.3.2 Pressure regulator with external tap 6.3.3 Differential-pressure external regulator with external taps type type, Actuating (where it is desired 6.4.1 Diaphragm elements to show the type of actuating top-mounted x regulators, 6.3.1 6.4 6.2.5 Pressure actuator f element) IS0 3511/2-1984 Diaphragm 6.4.3 Rotary actuator, motor pressure-balanced 6.4.7 Solenoid actuator with reset (remote electrical) actuator P M 6.4.4 Solenoid actuator (Preferred side relationship Local control panels Instruments on local control tional horizontal line across panels can be specified the symbol by an addi- Q I:21 The particular panel can be identified symbol, for example: by a note alongside Pressure indicator compressor panel 6.4.5 Piston actuator (Preferred side relationship Flow recorder vices panel 1:2) Signal modifiers, `,,,,,`,```,,`,,`,```,,,````,`-`-`,,`,,`,`,,` - 6.4.2 (E) the on the on the ser- analogue Lower case letter designations (for example al, an) are standardized values of signals, shown for descriptive purposes only They are not part of the symbol Other arithmetic functions may be similarly treated Upper case letters (for example Z) represent signals without specific values 6.4.6 Solenoid actuator with reset (manual) 8.1 Addition For example, Y c H s - flow al a2 a3 signals ,a1 +a2+a3 IS0 3!511/2-1984 (E) 8.2 Root extraction (square For example, flow 8.6 root) For example, signal 8.3 Limitation of output when a hand-set reached (same as selecting lower signal) For example, temperature Low-signal controller high-limit selector pressure signals when when al > a2 then Z = a2 al < a2 then Z = al 8.7 Reversing value is signal ahen al < a2 then Z = al Jvhen al > a2 then Z = az For example, relay pressure signal Z = -a a 3.4 Limitation of output eached (same as selecting when a hand-set higher signal) For example, controller when when temperature signal low-limit value is 8.8 Volume For example, signal 1:I Gain or attenuation For example, High-signal For example, when when level controller al < a2 then Z = a2 al > a2 then Z = al 8.9 8.5 booster flow selector pressure relay signals 0,75 signals al a2 then Z = al al ( a2 then Z = a2 - 3a IS0 3511/2-19&l 8.10 Characterizing For example, flow 10 Action signals relay f (x1 Digital-to-analogue or analogue-to-digital signal con- verter For example, signals on analogue signal When signal 8.11 of binary (E) pressure an input analogue signal A is influenced 13, the output analogue signal Z can by a binary a) retain the last value; or b) assume a predetermined minimum value; or c) assume a predetermined maximum value; or d) assume some other predetermined value This may occur in both the l-state and the O-state of the binary signal Diagrams are shown with electrical signals but are otherwise typical for all signals signals Where “A” “Z”, etc., appear in the examples, they are not a part of the symbol They are there for clarity of the symbol a (digital) 10.1 AID 8.12 On-off For example, output signal four temperature analogue input Z 8.13 Bias relay f , + or -, for plus-or-minus adjustability, Binary 10.1.1 Z retains the last momentary flow signal, representing for addition, with adjustable signal with 10.1.2 Z assumes the minimum value 10.1.3 Z assumes the maximum value binary (binary) relays respectively or for subtraction plus or minus bias, k logic The basic elements these shall have IEC 117-15 are “and”, rectangular “or”, “not” and “time lag” and symbols in accordance with B = 0, then there are value relay 1-O - For example, When B = 1, then Z = A When possibilities as follows: (N) 10.1.4 Z assumes (El a predetermined value, 10.2 When B = 0, then Z = A When four possibilities, as follows: 10.2.1 Z retains the last momentary for example 70 % B = 1, then there are value N 10.2.2 Z assumes the minimum 10.2.3 Z assumes the maximum A,, & value value ,’ ~z=1oo% 100% 10.2.4 LLr Z assumes a predetermined value, F for example 70 % = Z=70% 70% `,,,,,`,```,,`,,`,```,,,````,`-`-`,,`,,`,`,,` - IS0 3511/2-19&l