GB-10
D
GB
F
NL
I
E
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:
Pin 5: output -
3
6
4
5
2
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
max
(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
N
= total master meter testing time in s
Δt
P
= testing time of the unit under test in s
Q
max
= maximum flow rate of a gas meter
Q
min
= minimum flow rate of a gas meter
Q
N
= flow on master meter in m³/h based on
the displayed volume V
N
Q
act,N
= actual flow rate on master meter in m³/h
Q
P
= flow determined on unit under test based
on V
P
in m³/h
V
N
= displayed volume on master meter in m³
V
act,N
= actual volume having flowed through the
master meter in m³
V
P
= displayed volume on unit under test in m³
Value after C or U in display, depending
on device configuration and test method.
See test procedure below for further
details.
F
N
= error of the master meter in %
F
P
= error of the unit under test in %
p
N
= absolute pressure on the master meter in
mbar
p
P
= absolute pressure on the unit under test in
mbar
T
N
= absolute temperature on the master meter
in K
T
P
= absolute temperature on the unit under
test in K
t
b
= base temperature in °C
V
b
= converted volume with reference to t
b
and
p
b
p
b
= base pressure in mbar
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:
Type
Q
max
in
m
3
/h
Cyclic
volume
in dm
3
Test volume in dm
3
at
Q
min
0.2 Q
max
Q
max
BK-G6
10
6
6
60
300
BK-G10
16
6
6
60
300
BK-G16
25
6
6
60
300
BK-G25
40
12
12
120
600
BK-G40
65
18
18
180
900
▷
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.
