LACO Technologies TITAN Test - 6.4.2 Set filter & ZERO

LACO ORIGINAL OPERATING INSTRUCTIONS TITANTEST™
43
© 2018 LACO TECHNOLOGIES, INC. - [TitanTest itna01en1-07 BA.fm] - 1807
If you use a different tracer gas for the leak search than the one used later in
normal mode, you can convert the measured leakage rates (
4
He,
3
He or H
2
)
using a leakage rate factor:
 into an equivalent leakage rate of another gas
 into an equivalent leakage rate (4He, 3He or H2) under different flow con-
ditions than molecular flow
Under molecular flow conditions, the leakage rate only depends on the gas
mass.
Select " Setup > Test Settings > Mode & Mass" and make your settings ac-
cording to the table above.
Alternatively, you can switch the operating mode in the "Standby" window
via "Mode select".
6.4.2 Set filter & ZERO
 The setting of the leakage rate filter influences the representation of mea-
surement results. The setting recommended here, i.e. "Filter: dynamic",
ensures that the signals are averaged in optimized time intervals, and this
based on the respective leakage rate range. In addition, the filter elimi
-
nates interference peaks that have nothing to do with the leakage rate
signals and offers show reaction times even with low leakage rates.
 With "ZERO" you can suppress undesired helium or hydrogen back-
grounds. If "ZERO" is activated, the currently measured leakage rate value
will be interpreted as a helium or hydrogen background and subtracted
from all subsequently measured values.
If the background in the device is reduced, the background value sup-
pressed by "ZERO" is automatically adjusted.
In order to activate the "ZERO" function, briefly press the ZERO button on
the device or on the sniffer probe (see Chapter 6.5.2: "Measuring in "Sniff"
operating mode", page 53).
In order to deactivate the "ZERO" function, press the ZERO button on the
device or on the sniffer probe for longer than 3 seconds.
** Feature not available in TITANTEST™ Maintenance model
Table 19: Mode & Mass
Option Value range
(Min. Max.)
Comment
Operating
mode
Vacuum Vacuum mode
Sniff Sniff mode
Connect the sniffer line before pressing START
Auto Test** Auto Test mode**
Mass H
2
(2 amu) Detectable gas H
2
3
H (3 amu) Detectable gas
3
H
4
He (4 amu) Detectable gas
4
He
Leakage rate
factor
Factor
1E-6 … 1E+6
Leakage rate converted with user-defined factor