Test Procedure Tc 4 - Honeywell TC Series Technical Information

Function

3 .2 .2 Test procedure TC 4

The TEST starts with the waiting time t
ing time has elapsed, the tightness control TC checks
the pressure between the inlet valve V1 and the outlet
valve V2:
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 30
z u
(Test procedure B).
V1
p
u
Test procedure A
If pressure p is greater than half the inlet pressure p
TEST
z
valve V2 is tight. Valve V2 is opened for the opening
time t = 2 s. V2 closes again.
L
Test procedure A
During the measurement time t
+
checks the pressure p
z
V2 OK
If pressure p is greater than half the inlet pressure p
z
valve V1 is leaking.
V2
If pressure p is less than half the inlet pressure p
z
valve V1 is tight.
t = 2 s
L
V2
TC · Edition 08.17
t
M
. Once the wait-
W
p
PZ u
2
V2
p
z
START
t
W
Test procedure B
, the tightness control
M
–
p
u
p
>
between the valves.
z
2
V1
V1
t
L
V1
The tightness test can only be performed if the pres-
sure downstream of V2 is around atmospheric pressure.
TEST
, the
Test procedure A
z
V2
V2
t = 2 s
L
V2
t
M
p
p
>
z
2
/2,
u
V1
▼
OK
/2,
u
/2,
u
= 2 s
t
M
V1
p p
u z
START
t
W
+
p
u
p
>
z
2
OK
+
u
–
OK V1 V2
V2
Test procedure B
–
V1 OK
V1
t = 2 s
L
V1
t
M
–
p
u
p
>
z
2
+
V2 OK
29