IK
‐
E280
‐
001GB
5
Special
attention
shall
be
given
to
stability
of
ladders,
elevators,
lifts,
etc.
Any
electric
tools
shall
be
used
strictly
obeying
the
safety
rules
stated
in
instruction
manuals
by
manufacturers.
4.3
Anti
‐
dusting
eye
protection
It
is
obligatory
to
use
protective
anti
‐
dusting
glasses
and
masks
during
detector
installation
works
that
produce
high
amount
of
dust,
such
as
hole
drilling
in
ceilings.
5
CONSTRUCTION
DESCRIPTION
Cover
Optical
indicator
Junction
cover
Casing
Fig.
1
TUN
‐
38Ex
detector
overall
view
The
detector
casing
is
made
of
black
colour
plastic.
In
order
to
remove
electrostatic
charge,
low
surface
resistance
material
is
utilised.
The
thermistor
is
protected
with
a
specially
shaped
cover
that
ensures
proper
directional
characteristics.
Joints
to
connect
detecting
line
cables
and
cramps
to
set
activation
class
are
situated
under
the
cover.
Electronic
circuit
is
inundated
to
protect
from
adverse
operational
environment;
this
protection
assures
detector’s
in
proper
work
explosive
atmosphere.
6
PRINCIPLES
OF
OPERATION
The
TUN
‐
38Ex
heat
detector
reacts
to
a
rise
of
temperature
occurring
during
initial
phase
of
fire.
The
detector
operates
as
a
fixed
temperature
detector
after
exceeding
its
set
‐
off
operation
threshold,
according
to
its
given
class.
It
operates
also
as
a
rate
‐
of
‐
rise
heat
detector
‐
when
the
rapid
rise
of
temperature
exceeds
the
level
determined
for
the
detector,
according
to
its
given
class,
the
electronic
circuit
transmits
a
warning
signal
to
the
master
control
panel.
The
signal
may
also
result
from
the
thermistor
damage/malfunction.
The
detector
is
provided
with
a
signalling
LED
diode
that
shines
in
alarm
mode.
The
indicator
enables
fast
localisation
of
the
activated
detector
and
is
helpful
in
periodic
detector’s
inspections.
In
case
the
detector
is
installed
in
a
hard
to
reach
space,
an
additional
optical
alarm
signal
can
be
obtained
by
connecting
the
WZ
‐
31
alarm
in
an
accessible
and
visible
place.
The
detector
activation
times
for
particular
classes
are
given
in
Table
1
(according
to
PN
‐
EN
54
‐
5).
