6--6
50
Use and maintenance manual S20DSP
LETTER IDENTIFICATION OF
THE APPLIANCE
EXAMPLESTYPE OF COMPONENT
G
Generators, feeders Rotating generators
Crystal oscillators
G
Accumulator battery
Rotating or static frequency
converter
Power feeder
GB
GF
GS
H
Signaling Devices Buzzer
Optical signal, indicator light
device
HA
HL
J
K
Relays, Contactors Instant all or nothing relays or
instant contact ors
Bistable relays or interdepen-
dent contactors
(All or nothing contactors with
mechanical contact or perma-
nent magnet etc.)
Contactors
Polarised relays
Reed relays
All or nothi ng timed relays
(timers)
KA
KL
KM
KP
KR
KT
L
Inductors, reactors Inductor
Stop coil
Reactor
L
M
Motors
M
N
Analogue intgrated circuits Operational amplifiers
Hybrid analog/digital ap-
pliances
N
P
Measurement equipment, test de-
vices
Indicator, recorder and inte-
grator measurement devices
Signal generators
P
Q
Power circuit switching appliances Automatic switch
Engine saver switch
Knife switch
QF
QM
QS
R
Resistors Fixed or variable resistor
(rheostat)
R
S
Command or control devices Selector or switch
Button (including electronic
proximity switch)
Numerical all or nothing sen-
sors (single step) of mechan-
ical and electronic type:
--- L i q u i d l e v e l s e n s o r
---Pressure sensor
Position sensor (including
proximity)
---Rotation sensor
--- Te m p e r a t u r e p r o b e
SA
SB
SL
SP
SQ
SR
ST
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General