Phone: (408)744-9040
www.thinkSRS.com
UGA Series Universal Gas Analyzers
Guide to Operation
2 – 1
2.2.3 Options and Sample Heater Accessory
2.2.3.1 Multiple inlet Valve
Leak test Procedure
1.
Push the “Level-up” button to enter the main menu of
UGA.
2.
Select “Leak test”.
3.
Select “Mass Selection”
4.
Use the control keypad arrow keys to choose the mass (in
AMU) and press the enter key.
5.
Select “Audio Volume”
6.
Select the desired volume level and press the enter key.
7.
Select “ElectronMultipler” (EM).
8.
Select On and press the enter key to turn on EM.
9.
Select “On”
The resulting leak test display will show the mass setting, the sen
-
sitivity level, the volume level and the detected partial pressure. A
bar graph on the last row of the display indicates relative signal in-
tensity. To change the sensitivity, use the up and down arrow keys
of the control keypad.
The analog out BNC on the rear panel of the UGA will give a volt-
age proportional to the leak signal. The logarithmic value of this
level is converted to an analog voltage signal from 0 to 0 VDC; 0 V
for x0
-4
Torr and below, 5 V for x0-9 Torr, and 0 V for x0
-4
Torr and above. (Vdc = log
0
P(torr) + 4, P(torr) = x0
-4
x 0
Vdc
)
The audio frequency and pitch is also proportional to the bar graph
level in its own level. This audio indicator helps to check for leaks
when a user can not see the front panel. The audio can be turned
off by selecting ‘Off’ in the Audio menu.
Note that under leak test, the automatic keys Start and Sleep do not
function. The Stop key functions in any mode.
When the button for Multiple inlet valve on the front panel is
pushed, the Controls menu will display the present channel of the
valve. You can change channels using the Up or the Down buttons.
After the confirmation button is pushed, the valve will rotate to the
new position and the display returns to the pre-selected display.
