Dungs MPA 5111 - Page 11

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10 … 68
Printed in Germany • Edition 02.14 • Nr. 254 722
For a correct evaluation of the tests
carried out, the parameters P40 to
P46 must be correctly calculated and
set.
t
test V1
[s] Test time for V1
t
test V2
[s] Test time for V2
t
P43
[ ] to be entered in P43
t
P45
[ ] to be entered in P45
p
e
[mbar] Gas inlet pressure
p
S1
[mbar] Increasing switching pressure
(set pressure at the controller +15 %
+ switching dierence)
p
S2
[mbar] Falling switching pressure
(set pressure at the controller -15 %)
p
atm
[mbar] Atmospheric pressure = 1013
mbars
V
P
[dm
3
] Test volume between the valves to
be monitored
Q
P
[dm
3
/h] Admissible leakage rate according
to EN1643.
The leakage rate corresponds to
0.1 % of the burner's gas consump-
tion at maximum burner load, but
at least 50 dm
3
/h. A limit value of
200 dm
3
/h is recommended by
DUNGS!
S [ ] Safety factor, DUNGS recom-
mends triple safety
t
test V1
= ------------------------------- * 3600 s/h * S
p
e
* V
P
* In (p
e
/ (p
e
- p
S1
))
p
atm
* Q
P
t
test V2
= ------------------------------- * 3600 s/h * S
p
e
* V
P
* In (p
e
/ p
S2
)
p
atm
* Q
P
Formula to calculate the test
times for V1 and V2:
t
P43
= t
test V1
* 16/s
t
P45
= t
test V2
* 16/s