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Electrical pulse output
WARNING
Risk of explosion in explosion-hazard areas!
–
As a general rule, maintenance and repair work
should be avoided in explosive atmospheres.
–
Check that the electrical system complies with
the special electrical explosion protection re-
quirements.
–
When working on electrical equipment in an
explosion-hazard area, only design-approved
electrical operating equipment may be used.
–
This pulse output is not suitable for metrolo-
gical testing purposes, but for monitoring the
consumption.
▷ The generated pulses correspond to the values
shown in the technical data, see page 14
(Technical data).
▷ When gas consumption is higher than the output
can transmit its pulses, the pulses are buffered
and will be transmitted afterwards when con-
sumption is low.
Pin assignment:
Pin 1, 2, 4, 6: not connected
Pin 3: output +
Pin 5: output -
3
4
2
6
5
1
▷ To connect the pulse output, use a socket type
IEC 60130-9.
Check test
Directive 2014/32/EU (MID) prescribes that it must
be possible to check the meter.
▷ The requirements and test methods must comply
with national laws and regulations.
▷ The following tests describe the check tests
which are carried out by accredited testing
agencies.
▷ Always conduct a pressure and temperature
correction in accordance with established pro-
cedures (unit under test against master meter).
▷ Measurement accuracy class, see page 14
(Technical data).
▷ The unit under test must be acclimatized and
installed on the test rig.
▷ Maintain the climatic conditions constant dur-
ing the entire test duration. Otherwise, the test
results will be inaccurate.
▷ Immediately before commencing the test, pass
the quantity of test air, which corresponds to at
least 50 times the cyclic volume of the unit under
test, through the meter at a flow rate of Q
(maximum flow rate of a gas meter).
▷ To conduct the tests, the thermowell and the
pressure test point (if available) can be used as
a reference for the temperature and pressure
measured by the index.
Cyclic test
The manual test is described below.
Legend
Δt
= total master meter testing time in s
N
Δt
= testing time of the unit under test in s
P
Q
= maximum flow rate of a gas meter
max
Q
= minimum flow rate of a gas meter
min
Q
= flow on master meter in m³/h based on
N
the displayed volume V
Q
= actual flow rate on master meter in m³/h
act,N
Q
= flow determined on unit under test based
P
on V
P
V
= displayed volume on master meter in m³
N
V
= actual volume having flowed through the
act,N
master meter in m³
V
= displayed volume on unit under test in m³
P
Value after C or U in display, depending
on device configuration and test method.
See test procedure below for further
details.
F
= error of the master meter in %
N
F
= error of the unit under test in %
P
p
= absolute pressure on the master meter in
N
mbar
p
= absolute pressure on the unit under test in
P
mbar
T
= absolute temperature on the master meter
N
in K
T
= absolute temperature on the unit under
P
test in K
t
= base temperature in °C
b
V
= converted volume with reference to t
b
p
b
p
= base pressure in mbar
b
Cyclic test at a constant flow rate
▷ The test rig is in pre-trial operation.
▷ Maintain the flow rate constant.
Test load and minimum test volumes for the test with
index readout:
Q
max
Type
in
m
3
BK-G6
10
BK-G10
16
BK-G16
25
BK-G25
40
BK-G40
65
▷ The minimum test volumes are recommended
guide values. The measurement uncertainty of
the complete system (test rig plus unit under
test) must not exceed 1/3 of the maximum per-
missible error (MPE). The testing time must be
at least 10 s.
max
GB-10
N
in m³/h
Cyclic
Test volume in dm
volume
Q
0.2 Q
min
/h
in dm
3
6
6
6
6
6
6
12
12
18
18
and
b
3
at
Q
max
max
60
300
60
300
60
300
120
600
180
900
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