1
PURPOSE
The
TUN
‐
38Ex
Heat
Detector
is
designed
for
detection
of
fire
hazard
or
fire
appearance
warning
in
closed
rooms,
where
during
the
first
phase
of
fire
an
occurrence
of
temperature
rise
may
be
observed,
or
where
–
due
to
various
reasons
–
temperature
may
exceed
the
set
fire
danger
level.
It
is
provided
for
working
together
in
fire
detecting
lines
with
control
panels
manufactured
by
POLON
‐
ALFA
or
by
other
producers
that
obtained
POLON
‐
ALFA’s
compatibility
confirmation.
The
detector’s
operational
temperature
is
between
‐
25
°C
and
+
50
°C
for
A1
class
and
+
65
°C
for
B
class.
The
TUN
‐
38Ex
heat
detectors
are
connected
to
fire
detecting
lines
through
intrinsically
safe
barrier
or
separator
of
the
following
parameters:
Uo
≤
25
V,
Io
≤
99
mA.
The
detectors
are
installed
in
rooms
and
zones
qualified
as
1
st
and
2
nd
explosive
hazard
category
resulting
from
potential
explosion
danger
of
explosive
gases
or
inflammable
liquid
vapours
that
are
ranked
at
IIA,
IIB
and
IIC
explosiveness
subgroups
and
T1
up
to
T6
temperature
classes.
Allowable
ambient
temperature
range:
‐
25
°C
up
to
+
65
°C
for
T6
temperature
class,
‐
25
°C
up
to
+
85
°C
for
T1...T5
temperature
classes.
2
TECHNICAL
SPECIFICATIONS
Operating
voltage
20
V
+20
%
‐
15
%
Quiescent
current
<100
µA
Alarm
current
20
mA
Minimum
operational
temperature
limit
‐
25
°C
Relative
humidity
≤
95
%
at
40
°C
Detector
class
according
to
PN
‐
EN
54
‐
5
standard
A1R;
A1S;
BR;
BS
Activation
time
according
to
Table
1
Static
activation
temperature
54
°C
up
to
65
°C
(A1
class)
69
°C
up
to
85
°C
(B
class)
Normal
operating
temperature
25
°C
(A1
class)
40
°C
(B
class)
Mass
0,26
kg
(<0,3
kg
)
Dimensions
(L
x
B
x
H)
(fig.
4)
112
x
62,5
(83,5)
x
55
mm
Assembly
holes
spacing
72
mm
Casing
ingress
protection
IP
54
Casing
colour
Black
Intrinsic
safety
rating
Ex
i
b
IIC
T1
‐
T5,
for
<
65
°C
T6
