Dungs VPS 504 Manuel - Page 4

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Dungs VPS 504 Manuel
Functional description
The VPS 504 operates depending on
pressure build-up.
The program module starts to function
when heat is requested.
Test is performed depending on the
burner functional procedure:
Check prior to burner start or
Check during pre-purge period or
Check after burner shut-down
Release period t
F
Period which a VPS requires to per-
form a complete operation procedure.
The release period of the VPS 504
depends on test volume and input
pressure:
V
< 1.5 l
Test
p
> 20 – 500 mbar
e
V
> 1.5 l
Test
p
> 20 mbar
e
t
max. ≈ 26 s
F
Test period t
test
Pumping time of motor pump.
Test volume V
test
Volume between V1 output-side and
V2 input-side and the intermediate
tube pieces.
V
= 4 l
Test max. /VPS 504
Program sequence
p
e
= 500 mbar
V1
p
1
Program modul
p
e
VPS 504
p
p
1
p
p
e
p
p + 20 mbar
e
e
Idle state: Valves 1 and 2 are closed.
Pressure build-up: The internal mo-
= 500 mbar
tor pump increases the gas pressure
V1
in the test section by approx. 20 mbar
compared to the input-side pressure
p
1
Program modul
p
e
applied to valve V1.
During the test period, the installed
differential pressure switch monitors
VPS 504
the test section for leakage. If the test
p
p
1
p
p
e
pressure is attained, the motor pump
is switched off (end of test period). The
p
p
e
release time (10-26 s) depends on the
= 500 mbar
V1
Function principle
A
Program module
Instrument gland
Connection
Release period
t
F
}
t
≈ 10 s
F
}
t
> 10 s
F
p
= 500 mbar
max.
p
1
p
e
p
= 500 mbar
max.
V2
Idle state
p
1
p
2
p
e
p
a
2
a
test volume (max. 4.0 l) and input pres-
sure (max. 500 mbar). If the test section
p
= 500 mbar
max.
is tight, the contact is released to the
V2
automatic burner control after max. 26
p
1
s - the yellow signal lamp lights up.
p
p
2
e
p
a
If the test section is leaky or if the pres-
sure increase by + 20 mbar is not attained
during the test period (max. 26 s), the
VPS 504 switches to fault. The red signal
2
a
lamp lights as long as the contact release
by the regulator or thermostat is present
p
e
e
(heat requirement).
V2
p
= 500 mbar
max.
V1
DMV-D(LE)
p
1
p
e
VPS 504
p
1
p
e
[s]
30
28
26
Field of application
24
22
20
18
16
14
12
10
p
8
e
Release period
6
⊕ 10 s
at test volume
4
† 1,5 l
2
V1
V2
1
p
2
Program modul
p
a
VPS 504
p
p
1
2
p
p
e
a
p
p + 20 mbar
e
e
V1
V2
Pressure
p
2
Program modul
p
a
build-up
VPS 504
p
p
1
2
p
p
e
a
p
p
e
e
V1
V2
p
2
Program modul
p
a
VPS 504
p
p
1
2
p
p
e
a
V2
p
A
2
p
a
p
2
p
a
p
e
p
= 500 mbar
max.
V1
p
1
Program modul
p
e
VPS 504
p
1
p
e
p
e
p
= 500 mbar
max.
V1
2
3
p
1
Program modul
p
e
VPS 504
p
1
p
e
p
e
p
= 500 mbar
max.
V1
p
1
Program modul
p
e
VPS 504
p
1
p
e
p
e
If there is a short power failure during
the test or burner operation, the test
is started again automatically.
If the pumping time < approx. 10s,
the pressure difference between the
testing system and the inlet pressure is
balanced after pumping is finished.
Operation: The internal valve of the
VPS 504 is closed.
V2
p
2
p
a
p
2
p
a
p + 20 mbar
e
V2
Test volume
4
p
2
p
a
V
[l]
Test
p
2
p
a
p
p
e
e
V2
Operation
p
2
p
a
p
2
p
a
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