CERN/EF/EHS/TE 78-8 12 June 1978 AGM/fv
REFERENCE CODE FOR LABELLING EQUIPMENTS IN EHS
In view of standardizing the numbering of EHS equipments and in
O'l'der to make sure that identical apparatus has the same coding, this
note defines the typ.ical structure of labels which should be used, It
indicates the already existing elements of the dictionary which will have
to be updated by the designers, according to their needs.
l, IDENTIFICATION CODE
It includes 7 charactexis divided into 3 subsets:
2 characters (letter followed by letter or digit) defining the
system:
Ex. Ml superconducting magnet
BC cameras on R.CBC
2 letters. specifying either the element or the type of
measurement,
Ex, pp primary puanp
LE level measurement
3 digits which have to be chosen by the designer in order to
complete the code.
2. DICTIONARY TO BE USED FOR EHS EQUIPMENT
2.1 System and sub-system
The two characters used for defining the system and sub-system are
identical to those used for cable numbering (ref. 1) after a recent
revision of the original proposal.
)
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Table 1 shows the matrix of possible combinations. The vertical
entry indicates the first letter, the horizontal entry the second letter
or digit, The codes already used by designers of EHS equipment are
shown in the matrix.
2.2 Elements
Some of the elements have already been given a two letter code by
several designers. The same set of characters should be used for
identical equipment installed in other parts of EHS.
According to the needs, one can use a code which defines either the
type of measurement or the apparatus which deals with this signal
(sensor, controller, transducer).
It is indispensable for a given code not to be used with different
equipments. Table 2 gives the list of the combinations of characters
which have already been chosen.
2.3 Numbering
As mentioned earlier, any set of three digits may be selected by
designers, However, if the number of elements is small, it may be
desirable, especially for operation purposes, to define the points of
the installation with a given number and then to associate this number
to the various equipments related to measurements at this point.
Ex. level measurement LE 203
level indicator (same point) LI 203
fault indicator ( II II ) LF 203
level controller ( II II ) LC 203
Moreover, it may be handy to use the most significant digit in
order to distinguish identical equipment in symmetrical positions.
Ex. Strain gauge No 5 on coil No 2: 205
Pneumatic valve No 9 on vacuum system No 1 109
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If no special logic in the numbering is desirable or possible
in view of the total number of elements, the equipm(~nt should he numbered
in a sequential way.
The number of digits should ·,1ot be increased 'beyond J or indices
added in order to allow a more systematic numbe.ring.
2.4 Examples
BV PV 103
(pneumatic valve No 3 in vacuum system No l on RCll~)
Ml SE 205
(strain gauge No 5 on coil No 2 of the superconducting magnet)
3. REMARKS
The aim of proposing an identification system for the EHS
equipment is to simplify the design, operation and maintenance work
by selecting a unique code which may use mnemonics without requiring
an unnecessary length.
The information should appear on the drawings, the synoptics and
the equipment itself. However, the 2 first characters may not be
repeated for each element when there is no ambiguity concerning system
and sub-system. For instance, on a panel dedicated to RCBC vacutnn
system, equipment could be labelled PV103 (pneumatic valve), DP017
(diffusion pump) without repeating the leading BV.
Standard symbols reconnnended by CERN are shown 1H the document
on "normalisation" ref. 100 (75-04).
In the case of duplication of displays for the same measurement in
two different places (ex. platform and control room), it is suggested
to use thP same 7 character code for both and to give complementary
information to indicate that several apparatus exist.
- 4 -
The reference codes which do not yet exist in the dictionary
and which will have to be created during development of the system will
have to be sent to CERN (see attached list of persons) in order to be
filed.
Updatings of the dictionary will be addressed to the different
designers at regular intervals.
B.ef, l• H. Masuch, Cable, connector and reference equipment code
employed for experimental installations in the EHS area,
CERN/EF/EHS/TE 78-4, revised on 12 June 1978.
)
.... 5 .....
ANNEX
List of persona to whom new add~upa to the equipment code
dictionary should be sent and who should be contacted for information
related to this numbering procedure.
A. Guiard-Marigny (EF)
H. Masuch (DD)
K. Rogers (EF)
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