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Function
3 .1 .3 Test procedure for TC 1, TC 2, TC 3
Depending on the pressure between the valves p
tightness control TC carries out a check using test pro-
cedure A or B:
If pressure p
> p
/2, program A starts.
z
u
If pressure p
< p
/2, program B starts, see page 23
z
u
(Test procedure B).
Test procedure A
Valve V1 opens for the opening time t
again. During the measurement time t
control checks the pressure p
If pressure p
is less than half the inlet pressure p
z
valve V2 is leaking.
If pressure p
is greater than half the inlet pressure p
z
valve V2 is tight. Valve V2 is opened for the set opening
time t
. V2 closes again.
L
During the measurement time t
checks the pressure p
z
If pressure p
is greater than half the inlet pressure p
z
valve V1 is leaking.
If pressure p
is less than half the inlet pressure p
z
valve V1 is tight.
The tightness test can only be performed if the pres-
sure downstream of V2 is around atmospheric pressure.
TC · Edition 08.17
= 3 s and closes
L
, the tightness
M
between the valves.
z
, the tightness control
M
between the valves.
, the
z
p
u
Test procedure A
V1
t
= 3 s
L
V1
/2,
u
t
M
/2,
u
p
u
p
>
z
2
+
V2
OK
V2
/2,
u
t
= 3 s
L
/2,
u
V2
t
M
p
u
p
>
z
2
–
V1
OK
V1
V2
p
z
START
+
–
p
u
p
>
z
2
–
V2
V1
+
V1
V2
TEST
Test procedure B
V2
t
= 3 s
L
V2
t
M
+
p
u
p
>
z
2
–
V1
OK
V1
t
= 3 s
L
V1
t
M
–
p
u
p
>
z
2
+
V2
OK
22
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