MULTICAL®
403
80
Kamstrup
A/S
∙
Technical
description
∙
5512
‐
1689_B1_GB_03.2017
7.2.1
Measurement
of
the
coefficient
of
performance
(CP)
of
a
gas
boiler
If
the
pulse
output
of
a
gas
meter
is
connected
to
a
heat
meter,
the
coefficient
of
performance
of
the
gas
boiler
can
be
measured,
in
terms
of
e.g.
kWh/Nm
3
gas.
A
volume
resolution
which
corresponds
to
the
pulse
weighting
on
the
gas
meter
pulse
output
must
then
be
selected
for
input
B.
7.3
Offset
adjustment
of
temperature
sensor
measurement
MULTICAL®
403
is
available
with
possible
offset
adjustment
of
the
temperature
sensor
measurement,
thus
increasing
the
accuracy
of
the
absolute
temperature
measurement.
This
is
especially
relevant
in
the
installation
scenario
that
the
meter
is
to
be
used
for
tariff
billing
based
on
absolute
temperatures.
In
that
case
it
is
an
EN1434
requirement
that
the
accuracy
of
the
meter’s
absolute
temperature
reading
must
be
within
±
1,0
K.
Offset
adjustment
is
extremely
relevant
in
district
cooling
installations
too.
In
district
cooling
installations
the
customer
often
requires
a
maximum
inlet
temperature.
Absolute
temperature
measurement
measuring
with
undesirable
inaccuracy
can
cause
the
supplier
to
supply
water
with
a
lower
inlet
temperature
than
promised,
resulting
in
unnecessary
extra
costs
for
the
supplier.
Depending
on
the
meter’s
configuration,
offset
adjustment
can
be
programmed
into
the
meter
from
the
factory.
Offset
can
also
be
adjusted
after
delivery
via
the
meter’s
SETUP
loop
(see
paragraph
6.3)
or
via
METERTOOL
HCW
(see
paragraph
14).
Note:
Depending
on
the
meter’s
configuration
offset
adjustment
can
be
disabled
and
the
menu
point
in
SETUP
loop
will
in
that
case
display
“Off”.
If
the
temperature
sensor
pair
of
a
meter
with
offset
adjustment
is
replaced,
we
recommend
that
offset
is
corrected
to
match
the
newly
connected
sensor
pair.
Alternatively,
offset
should
be
adjusted
to
0.00
K,
which
means
that
the
function
is
switched
off
and
does
not
contribute
to
an
undesirable
increase
of
the
error
of
the
absolute
temperature
measurements.
Temperature
sensor
offset
(t
r0
)
can
be
adjusted
in
the
interval
‐
0.99…0.99
K
according
to
the
meter’s
approval.
Please
be
aware
of
that
the
required
offset
adjustment
must
be
entered,
not
the
error
of
the
temperature
sensor
pair.
If
the
selected
temperature
sensor
pair
contributes
with
an
error
of
‐
0.20
K,
the
meter’s
offset
must
be
set
