VS Series Helium Mass Spectrometer Leak Detectors
DRAFT 4/23/15
1-19
LCD Display Represents:
❑ Leak Rate - in a Bar Graph format with a numeric range
indicator
❑ Leak Rate, System Status and Parameters - in alphanumeric
format
❑ Series of screens with the soft key buttons for operator
interface
Leak Rate, System Status and Parameters in alphanumeric format:
❑ Leak Rate is presented in a scientific notation: XXE-YY with
appropriate units
Where: X .X mantissa is a leak rate value
E- Y = 10-YY exponent is a leak rate range
X and Y are any numbers from 0 to 9
❑ System Status and/or Mode are represented on the screen in
alpha format on the screen and an italic font in this manual
❑ Parameters are represented on the screen in alphanumeric
format a bold font in this manual.
Leak Rate Bar Graph The large bar graph displays the leak rate in one of three forms:
❑ A linear bar graph
❑ A logarithmic bar graph
❑ Both linear and logarithmic bar graphs
Use the Output Control Set-Up screen (Section 3.1.8.3.1 “Cal Leak
Expiration Set-Up” on page 3-23) to change the type of bar graph
that appears.
Over-range and under-range conditions are indicated using two up
and down arrows on the right and left side of the bar graph, respec-
tively.
VENT The VENT button advances the leak detector to the vented state. A
red LED illuminates while the leak detector is in the vented state.
TEST When the system is in the Vent or Hold states, pressing the TEST
button automatically advances the leak detector through roughing,
then through the various test states, depending on the achievable
test port pressures and leak rates. A green TEST LED in the button
illuminates when the leak detector is in the Test or Fine Test state.
Press the VENT button to isolate the test port from the leak detector
vacuum system and vent the test port to atmosphere. The red VENT
LED remains lit while the leak detector is in the vented state. To
activate the VENT function, press and hold VENT for one second.
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