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Test pressure switch
One or two pressure switches can be used for
monitoring the pressure in the test section:
A change-over contact is required if a com-
mon pressure switch (P
phases 1 and 2.
The switch point of the pressure switch must
be set to half of the gas flow pressure.
If set properly, two pressure switches de-
tect even small amounts of leaked gas. The
amounts of leaked gas can be individually set
to the required value for:
Limit value
The DSLC must prevent ignition and the
opening of the actuators at a limit value < 0.1
% of the burner consumption (with regard to
the burner capacity), or < 50 dm
value must be taken into account). We recom-
mend that a max. limit value of 200 dm
should not be exceeded.
V °
= leak rate V1
V1
V °
= leak rate V2
V2
Calculation examples (calculation steps I and II)
for a DN 100 test section:
I) Calculation of the volume of the test section
V1 + V2, DN 100
Line DN 100, length 1.5 m
V3 + V4, Rp ½
Line V3 / V4 1/2", length 2 m
II) Calculation of leak rates
Burner capacity
p
1
p
2
p
disch
p
fill
p
atm
t
testV1
t
testV2
limit value as per standard
Recommended limit value
Result of the calculation:
Leak rate V1
Leak rate V2
Legend of the calculations:
p
= switch point of pressure switch P1 or Pp rising [mbar]
1
p
= switch point of pressure switch P2 or Pp falling [mbar]
2
p
= gas pressure after discharge [mbar]
disch
p
= gas pressure after filling [mbar]
fill
9 ... 25
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test phase 1 (safety solenoid valve) with pres-
sure switch P1 and
test phase 2 (burner solenoid valve) with pres-
sure switch P2.
) is used for test
p
The pressure switches used must
meet the requirements of EN 1854!
Gas leakage rate
The gas leakage rate can be recalculated us-
ing the equations, and the switch points of the
test switches can be changed if necessary.
3
/h (the higher
3
/h
(p
°
1
= ––––––– p –––– · –– t ––––––––– dm /h
V
V1
(
p
V ° =
–
–
–
f i
ll
V2
V = 6.50 dm
3
V = 12.00 dm
3
V = 0.07 dm
3
V = 0.40 dm
3
V
= 18,97 dm
3
p
System with 1 pressure switch
30 m
3
/h
11 mbar
9 mbar
1 mbar
18 mbar
1013 mbar
25 s
22 s
50 dm
3
/h
°
V
= 26,97 dm
V1
°
V
= 27,58 dm
V2
https://www.add-furnace.com/
- p
) · V
· 3600 s/h
disch
P
atm
test V1
-
p
)
·
V
·
3
6
0
0
s
/
h
–
–
–
–
–
–
–
–
–
––
–
–
–
–
–
––– dm
2
P
3
/h
p
· t
atm
test V2
3
/h
3
/h
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Test volume of valves
and MVD pipelines
Nominal diameters
dm
Rp
DN
Valve
1/2
0,07
3/4
0,12
1
0,20
1 1/2
0,50
2
0,90
40
0,70
50
1,20
65
2,00
80
3,80
100
6,50
125
12,50
150
17,50
200
46,00
Test volume DSLC:
min. 1,5 dm
3
3
System with 2 pressure switches
400 m
3
/h
60 mbar
220 mbar
18 mbar
500 mbar
1013 mbar
25 s
22 s
400 dm
3
/h
200 dm
3
/h
°
V
= 113,26 dm
3
/h
V1
°
V
= 183,86 dm
3
/h
V2
p
= atmospheric pressure [mbar]
atm
t
= test time V1 [s]
testV1
t
= test time V2 [s]
testV2
V
= test section volume [dm
p
3
dm
3
/m
Pipeline
0,20
0,30
0,50
1,40
2,00
1,40
2,00
3,40
5,00
8,00
12,40
17,80
31,40
3
]
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