INFICON Helium Leak Detector Modul1000 - Manual (Page 58)

6-17
Operation
jinb
80
e1
-h
Op
er
at
in
g M
a
nua
l
(1
01
2)
→
Volume
In the menu item "Volume", it is possible to adjust the volume of the alarm signals by
pressing the buttons "
↑" and "↓" on the left and on the right of the displayed value. In
addition, the volume can also be adjusted during the measurement in the
measurement screen using the keys labelled with a loudspeaker sign.
If a minimum sound level is set in the menu item "Volume", it will not be possible to
set a lower sound level in the measurement screen or in the menu item "Loud-
speaker".
Beep sound: The "Beep On" or "Beep Off" buttons serve for switching On/Off the
beep sound of the Modul1000. If the beep is switched on, the Modul1000 indicates
certain changes of status by short audio signals.
→
Units
The units which are measured by the Modul1000 can be altered.
There is the choice of several pressure units, e.g. mbar, Pa, atm and Torr as well as
the leak rate units, e.g. mbar l/s, Pa m3/s, Torr l/s, atm cc/m and atm cc/s.
In Sniff mode, the following additional units are selectable: ppm, g/a, oz/yr.
→
Alarm delay
To avoid a trigger alarm due to high background levels, e.g. during the evacuation
process, an alarm delay can be set. The alarm delay time will start, after the
Modul1000 has changed from the Evacuation mode to the Measurement mode. Trig-
ger 1 will release only then when the set alarm delay time has expired or the meas-
ured leak rate was below the set trigger value for a short time.
The alarm delay can vary between zero and ten minutes. If the set time exceeds 10
minutes, the alarm delay time is automatically set to unlimited.
→
Audio Alarm Type
There are three optional alarm types.
• Pinpoint:
The audio signal changes its frequency only within a leak rate window which
reaches from one decade below the trigger threshold 1 to one decade above the
trigger threshold 1. Below this window, the audio signal frequency remains
constantly low and above this range it remains constantly high.
For example: The trigger limit is 4×10
-7
mbar l/s. With this, the window reaches
from 4×10
-8
mbar l/s to 4×10
-6
mbar l/s.
• Leak rate prop.:
The frequency of the acoustic output is proportional to the reading on the
bargraph display. The frequency ranges from 300 Hz to 3300 Hz.
Warning
The hearing may be damaged by the alarm signal.
The noise level of the Modul1000 alarm can exceed 85dB(A).
Only expose yourself to the alarm signal for a short time or use ear protection.