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volume. The suggested value can be accepted by pressing the key ' ' and then modified by selecting, in
"UNI 11137 Configuration" the line "volume".
It is also possible to repeat the measurement of the volume by pressing the key relative to the interactive
function ' '.
Table volumes:
Examples relating to the various lengths of indoor systems, capacity approximately corresponding to
18 dm
3
, depending on the material and the diameter of the fuel gas adduction pipe.
Note: When the measurement group can not be excluded from the test, the indicative length of the plant is given
in brackets.
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Once the stabilization mode has been defined and the required data has been entered, you can proceed with the
tightness test. By pressing the key relative to the context key ' ', first the test pressure is indicated, as
required by law, then you can access a screen which displays the pressure reading of the inputs of the device.
After zeroing the device and putting the system under a pressure of at least 100 hPa, it is possible to start the
tightness test by pressing the key relative to the context key ' ', which starts the stabilization phase. In the
stabilization screen, the following values are displayed:
P diff
:
Actual pressure measured by the instrument, in the selected measurement unit.
∆P 1 min
: Pressure variation in the last minute, updated every 10 seconds. This value gives a rough indication
about the stabilization level reached in the piping system.
Wait time
: Remaining time before the stabilization phase ends.
Once the stabilization phase is terminated the tightness test is started. This test is performed by observing how
the pressure decays in time during a fixed 1 minute interval for Methane and LPG in air and 2.5 minutes for the
LPG fuel, as stated in the applied standard.
During the tightness test phase the following values are displayed:
P1
:
Pressure measured at the beginning of the test
P2
:
Pressure actually measured by the instrument
∆P
:
Pressure variation with respect to the initial value. In case the actual pressure is lower than the initial
value (pressure is decreasing) this value has a negative sign.
Wait time
: Remaining time before the Test phase ends.
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Once the test has finished, the results are displayed; the data displayed is as follows:
P1
:
Pressure measured at the beginning of the test
P2
:
Pressure measured by the device.
∆P
:
Pressure variation between the last instant and the first instant of the test. If the pressure decreased, it
presents a negative value.
Qtest
: Is the calculated leakage measured in dm
3
/h according to the conditions under which the test has been
performed, i.e. the gas used for the test as well as the final pressure measured during the test.
Qref
: is the calculated leakage measured in dm
3
/h according to the reference conditions described in the
standard, it is related to the gas to be used in the piping as well as to the reference pressure.
Steel
Copper / Multilayer/ Polyethylene
Diameter
length (m)
Internal diameter (mm)
length (m)
1/2"
82 (68)
10
228 (190)
3/4"
49 (40)
12
160 (133)
1"
28 (23)
14
116 (97)
1 1/4"
17 (14)
16
90 (75)
19
64 (53)
25
37 (31)
26
34 (28)
34
20 (17)
Summary of Contents for E INSTRUMENTS 1500
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