990 CLD Autoline™ Leak Detector
DR
AFT 2/2/04
1-7
Table 1-4
Primary Operating Controls and Indicators
Item Control/Indicator
Function
1
LEAK RATE Display
Bar graph display. Indicates leak rate in std cc/sec. Over-scale and
under-scale conditions are indicated by LEDs at the right and left
of this display, respectively. The exponent in the window next to
the
10-
mark reads 0 through 9, depending on the settings of the
RANGE SELECT switch and RANGE pushbuttons.
2
FILAMENT LED
Green LED which lights when the filament in the spectrometer
tube ion source is on and functional.
3
ZERO Adjustment
Potentiometer used to zero out the background trace gas
detection.
4 HIGH
VAC
PUMP
READY LED
Green LED which lights when the high vacuum pump is
operational and running at its correct speed.
5
Set Point DISPLAY
Momentary pushbutton which causes the selected set point to be
displayed on the LEAK RATE bar graph.
6
Set Point SET
Screwdriver potentiometer used to set the selected set point.
7
Set Point ON
Red LED which indicates that the leak rate has exceeded the set
point.
8 MAIN
POWER
ON/OFF
Toggle switch which provides power to the entire leak detector.
9
SPECTROMETER TUBE Meter which indicates pressure in the spectrometer tube as
measured by the cold cathode gauge.
10
RANGE
Up and down pushbuttons that select the decade shown on the
bar graph and exponent. Pushbuttons allow direct reading of a
given leak. Used in conjunction with the RANGE SELECT switch.
11
RANGE SELECT switch A rotary switch that selects the least sensitive range displayed.
See Table 3-2.
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