TC · Edition 08.17
23
Function
Test procedure B
Valve V2 opens for the opening time t
L
= 3 s and closes
again. During the measurement time t
M
, the tightness
control checks the pressure p
z
between the valves.
If pressure p
z
> p
u
/2, valve V1 is leaking.
If pressure p
z
< p
u
/2, valve V1 is tight. Valve V1 is
opened for the set opening time t
L
. V1 closes again.
During the measurement time t
M
, the tightness control
checks the pressure p
z
between the valves.
If pressure p
z
< p
u
/2, valve V2 is leaking.
If pressure p
z
> p
u
/2, valve V2 is tight.
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.
t
L
= 3 s
t
M
–
–
+
+
+
–
t
M
p
z
>
p
u
2
V1
V1
V1
p
z
>
p
u
2
V2
OK
V2
V1
OK
V2
V2
t
L
= 3 s
t
L
= 3 s
t
M
+
–
t
M
p
z
>
p
u
2
+
–
V2
V2
V2
p
z
>
p
u
2
V1
OK
V1
V2
OK
V1
V1
t
L
= 3 s
p
u
p
z
p
z
>
p
u
2
TEST
V1
V2
Test procedure
A
Test procedure
B
START