A
Delta
Arm
and
4
Tripod
Mount-
ing Adaptors are included with
the
Type
1213
and
five
Transducers
when
the
Indoor Climate Analyzer
Measur-
ing
Set
Type
3532 is ordered (Fig. 1).
A
Tripod
can
also be
supplied
as
an
optional ·accessory. · · ·
Measurements
obtained
using
the
Indoor
Climate
Analyzer
can
be
read
directly from
the
Display,
or
stored
in
the
non-volatile memory
and
subse-
quently
plotted
on
an
X - Y Recorder
such as B
& K
Type
2308. Level Re-
corders,
such
as B & K
Type
2317,
and
the
Graphics
Printer
Type
2318 (if
1213/WH
1791 is ordered)
may
also be
used.
Description
Air
Temperature
Transducer
The
Air
Temperature
Transducer
(MM 0034) shown
in
Fig. 2 is
based
on
an
extremely accurate,
platinum
(PtlOO) resistance
temperature
sensing
element.
This
resistor is
surrounded
by
an
open-ended
radiation
shield, which
reduces
the
thermal
radiation
effects
of
the
environment. Since
platinum
has
a well defined
temperature
coeffi-
cient,
air
temperature
can
be accurate-
ly
measured
by a change
in
resistance.
Surface
Temperature
Transducer
The
Surface
Temperature
Trans-
ducer
(MM
0035) shown
in
Fig. 3 is
also
based
on a PtlOO resistor
at-
tached
to
a
thin
diaphragm.
The
dia-
phragm
is simply placed
in
contact
with
the
surface whose
temperature
is
to
be measured.
The
diaphragm
is
at-
tached
to
a conical housing which pro-
tects
the
temperature
sensing ele-
ment.
Additional
protection
is also
provided by a
spring
loaded
attach-
ment
between
the
sensor
and
the
transducer
handle.
This
spring
system
also enables surface
temperature
mea-
surements
to
be
obtained
from
sur-
Pt 100 Temperature Sensing Element
Shield Support
/
Thermal Racfiation Shield
Fig.
1 The Indoor Climate Measuring Set Type 3532
and
optional Tripod
faces which are
not
perpendicular
to
the
transducer
handle.
Radiant
Temperature
Asymmetry
Transducer
The
Radiant
Temperature
Asym-
metry
Transducer
(MM
0036) consists
of
two identical faces
(A
and
B) which
independently
measure
incident
radi-
ation
on each
plane
surface (Fig. 4).
Radiant
temperature
asymmetry
(~t
pr
)
is defined as
the
difference be-
tween
the
plane
radiant
temperature
(tpr) on two opposite sides
of
a small
black element.
The
parameter
tpr
de-
scribes
the
heat
radiation
in
one direc-
tion.
It
is defined as
the
uniform
sur-
face
temperature
of
a
half
room
that
produces
the
same
incident
radiation
on a black surface as
the
actual
envi-
ronment.
In
addition
to
measuring
t
pr
and
~t
p
n
the
MM
0036 also measures
incident
power which is
the
gross
amount
of
radiation
that
a black sur-
face receives from
the
environment.
The
net
amount
of
received
radiation
is significantly less
than
the
incident
power because
the
surface
itself
radi-
ates
as
it
is above OK (-273°C).
By
measuring
tpr
in
several directions
the
mean
radiant
temperature
can
also be
calculated.
Each
face
of
the
Transducer
con-
sists
of
a reflective
gold-plated
ele-
ment
and
a black
painted
element
of
the
same size.
Both
elements
are con-
nected
to
a
centreblock
via
thermo-
piles.
When
either
heated
or
cooled by
the
environment,
the
gold-plated
ele-
ment
gains
or
looses
heat
entirely
by
convection whereas
the
black
element
looses or gains
heat
both
by convec-
tion
and
radiation.
Thus,
as
both
ele-
ments
have essentially
the
same
tem-
perature,
the
resultant
difference volt-
age
produced
across
the
thermopiles
is
a function
of
the
heat
transfer
by radi-
ation
between
the
black
element
and
the
environment.
The
tpr is calculated
from
this
measurement
and
from
the
temperature
inside
the
centreblock
which is
measured
using a PtlOO
tem-
perature
sensitive resistor.
Humidity
Transducer
The
Humidity
Transducer
(MM
0037) is a
dew-point
transducer
(Fig. 5).
When
a
humidity
measure-
ment
is selected, a cooling
element
be-
low a conical
mirror
in
the
Transducer
840793
Fig. 2
Air
Temperature Transducer
(MM
0034)
2
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