MAN Operating Instructions

MAN Diesel & Turbo 5.4

Appendix

Figure 3: Symbols used in functional and pipeline diagrams, 3/4
6680 5.4-02 EN
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Appendix

General

3 (5)

5.4 MAN Diesel & Turbo

Appendix

Figure 4: Symbols used in functional and pipeline diagrams, 4/4

Abbreviations for measuring, control and regulating devices

In system diagrams, measuring, control and regulating devices are marked
with a combination of letters. The components of these letter combinations
have the following meanings:

Letter Letter ... in position 1 denotes Letter ... in position 2 denotes Letter ... denotes
the measured variable/input variable ... the measured variable/input variable ... in position 2 ... n
A the processing in the form of ...
C
—— —— Alarm/limit value alarm
D
E —— —— automatic closed-loop control/
F automatic continuous open-
G loop control
H
Density Difference ——
Appendix
Pick-up/sensor
General
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electrical variable ——

Flow/flow rate Ratio ——

Clearance/length/position —— ——

manual input/manual action —— ——

4 (5) 6680 5.4-02 EN

MAN Diesel & Turbo 5.4

Letter Letter ... in position 1 denotes Letter ... in position 2 denotes Letter ... denotes Appendix
the measured variable/input variable ... the measured variable/input variable ... in position 2 ... n
the processing in the form of ...

I —— —— Display

J —— —— Scanning

K Time —— ——

L Level —— ——

M Humidity —— ——

N freely available —— freely available

O freely available —— visual display/yes or no state-
ment

P Pressure —— ——

Q other quality variables (analysis, Integral/sum ——
material property) except D, M, V

R nuclear radiation —— Registration/storage

S Speed/rotational speed/fre- —— Switching/non-continuous
quency open-loop control

T Temperature —— Measuring transducers

U combined variables —— ——

V Viscosity —— Actuator/valve/Actuating ele-
ment

W Weight/mass —— ——

X other variables —— other processing functions

Y freely available —— Arithmetical operation

Z —— —— Emergency action/securing by
triggering/shutting down

Column 1 Column 2 Column 3 Column 4

Table 1: Abbreviations for measuring, control and regulating devices in functional and piping diagrams

Comment The letter in position 1 represents a variable in the second column of the
table. This can be supplemented by D, F or Q; the meaning then corre-
sponds to the entry in column 3 of the table. Position 2 or 3 of the combina-
tion of letters can be occupied, if required, by letters from column 4. Multiple
designations are possible here. The sequence in which they should be used
is Q, I, R, C, S, Z, A.

It can be supplemented with + (upper limit/on/open) or - (lower limit/off/
closed) but only after O, S, Z and A.

Examples T Temperature Measuring point (without sensor)

TE Temperature Sensor

TZA+ Temperature Shut-off/alarm (when upper threshold is reached)

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Appendix

General
PO Pressure visual display

PDSA Pressure Difference/switching/alarm

6680 5.4-02 EN 5 (5)



MAN Diesel & Turbo 5.5
Brochures
Appendix
Supplementary brochures

We also provide the following in addition to the printed documents in the Vol-
umes "About us“ and 010.290 Engine control and monitoring:
▪ SI units
▪ CoCoS EDS

2007-04-20 - de

Appendix

General

6680 5.5-01 EN 1 (1)