GB-7
D
GB
F
NL
I
E
Setting measurement time t
M
▷
The measurement time t
M
can be set with a
jumper in increments of 5 s to max. 30 s.
▷
t
M
is set to 30 s at the factory.
t
M
5s
10s
15s
20s
25s
30s
▷
No jumper: no function. The
1
2
Power
LED is perma-
nently red, see page 8 (Assistance in the
event of malfunction).
▷
The longer the measurement time t
M
, the greater
the sensitivity of the tightness control. The longer
the measurement time, the smaller the leakage
rate at which a safety shut-down/fault lock-out
is triggered.
▷
For all CG versions, the measurement
time t
M
must be set to 5 s on TC 1C.
▷
If no leakage rate is specified, we recommend
the max. measurement time is set.
▷
Within the scope of the European Union, the
maximum leakage rate Q
L
is 0.1% of the maxi-
mum flow rate Q
max.
[m
3
/h (n)].
▷
If a leakage rate is specified, find the measure-
ment time t
M
from the following:
Q
max.
= max. flow rate [m
3
/h]
Q
L
= Q
max.
[m
3
/h] x 0.1% = leakage rate [ l/h]
p
u
= inlet pressure [mbar]
V
P
= test volume [ l ], see page 7 (Values for
▷
The tightness control TC requires a minimum
start rate in order to carry out tightness tests
on slow opening valves:
up to 5 l (1.3 gal) test volume V
P
= 5% of maxi-
mum flow rate Q
max.
, up to 12 l (3.12 gal) test
volume V
P
= 10% of maximum flow rate Q
max.
.
Determine measurement time t
M
.
▷
Measurement times t
M
for V1 and V2:
t
M
[s] =
2.5 x p
u
[mbar] x V
P
[ l ]
Q
L
[ l /h]
▷
The entire test period is made up of the meas-
urement times t
M
of both valves and the fixed
opening time t
L
of both valves together:
t
P
[s] = 2 x t
L
+ 2 x t
M
Values for valve and pipe volume
L
V
P
= V
V
+ L
x
V
R
V
P
V1
V2
Valves
Valve
volume
V
V
[ l ]
Nomi-
nal size
DN
Pipe
volume V
R
[ l/m]
VG 10
0.01
10
0.1
VG 15
0.07
15
0.2
VG 20
0.12
20
0.3
VG 25
0.2
25
0.5
VG 40/VK 40
0.7
40
1.3
VG 50/VK 50
1.2
50
2
VG 65/VK 65
2
65
3.3
VG 80/VK 80
4
80
5
VG 100/VK 100
8.3
100
7.9
VK 125
13.6
125
12.3
VK 150
20
150
17.7
VK 200
42
200
31.4
VK 250
66
250
49
VAS 1
0.08
VAS 2
0.32
VAS 3
0.68
VAS 6
1.37
VAS 7
2.04
VAS 8
3.34
VAS 9
5.41
VCS 1
0.05
VCS 2
0.18
VCS 3
0.39
VCS 6
1.11
VCS 7
1.40
VCS 8
2.82
VCS 9
4.34
Calculation example:
Q
max.
= 100 m
3
/h
p
u
= 100 mbar
V
P
= V
V
+ L x V
R
= 7 l
Q
L
= 100 m
3
/h x 0.1% = 100 l/h
2.5 x 100 x 7
= 17.5 s
100
Set the next highest value (in this example 20 s)
with the jumper.
Disconnect the unit from the electrical power
supply.
Unscrew the housing cover.
4
Set the jumper to the position for the required
measurement time.
5
Position the housing cover and screw tight.
6
Mark the set measurement time t
M
on the type
label with a waterproof pen.
TC
D-49018 Osnabrück, Germany
t
M
(s) 5 10 15 20 25 30
▷
The entire test period for this example is as fol-
lows: 2 x 3 s + 2 x 20 s = 46 s.