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Function
Test procedure B
Valve V2 opens for the opening time t
again. During the measurement time t
control checks the pressure p
If pressure p
> p
/2, valve V1 is leaking.
z
u
If pressure p
< p
/2, valve V1 is tight. Valve V1 is
z
u
opened for the set opening time t
During the measurement time t
checks the pressure p
z
If pressure p
< p
/2, valve V2 is leaking.
z
u
If pressure p
> p
/2, valve V2 is tight.
z
u
The tightness test can only be performed if the pres-
sure downstream of V2 is around atmospheric pressure
and the volume downstream of V2 is at least 5 x higher
than the volume between the valves.
If the power fails briefly during the test or during opera-
tion, the TC will restart in accordance with the test pro-
cedure described above.
If there is a fault message, the fault is displayed again
after a power failure.
TC · Edition 08.17
= 3 s and closes
L
, the tightness
M
between the valves.
z
. V1 closes again.
L
, the tightness control
M
between the valves.
V1
V2
p
p
u
z
START
Test procedure A
+
p
>
z
V1
t
= 3 s
L
V1
t
M
–
p
u
p
>
z
2
+
V2
OK
V2
V2
t
= 3 s
L
V2
t
M
+
p
u
p
>
z
2
–
V1
OK
V1
TEST
Test procedure B
–
p
u
2
V2
t
= 3 s
L
V2
t
M
+
p
u
p
>
z
2
–
V1
V1
OK
V1
t
= 3 s
L
V1
t
M
–
p
u
p
>
z
2
+
V2
V2
OK
23
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