Model 979 Series Helium Mass Spectrometer Leak Detector
DRAFT 9/15/03
3-7
3.1.3 Manual Valve Control
Touch the MANUAL VALVE CONTROL box to display the Manual Valve Control screen
(Figure 3-6), which provides manual control of the valves in the 979 vacuum system for
troubleshooting purposes. See Figure 3-7 on page 3-8 for an illustration of the 979 Vacuum
System.
CAUTION
Manipulation of the valves through the Manual Valve Control
screen should only be done by persons who are extremely
familiar with the 979 Series leak detector as damage to critical
components (e.g., spectrometer tube) could occur.
Figure 3-6
Manual Valve Control Screen
To change the state of a specific valve, touch the box corresponding to that valve. The
valve changes state and the box changes from OPEN to CLOSE. Touch DONE to return to
the maintenance menu screen. The valve state displayed to the right of each valve control
box represents the current state of the corresponding valve. The normal operating states of
valves for single mechanical and dual pump systems are provided in Table 3-1 and
Table 3-2 on page 3-8, respectively.
Table 3-1
979 Valve State Table - Single Mechanical Pump System
979 Operating State
V1
V2
V4
V5
V6
V7
VENT
O*
C**
C
O
C
C
ROUGH
C
O
C
C
O
C
CONTRA-FLOW
C
O
C
O
O
C
MIDSTAGE
C
C
O
O
O
C
SNIFF MODE
C
O
C
O
O
C
*O – Open
**C – Closed
OPEN VENT VALVE
CLOSE CONTRAFLOW VALVE
CLOSE TEST PORT VALVE
CLOSE FORELINE VALVE
CLOSE MIDSTAGE VALVE
OPEN STD LEAK VALVE
DONE
CLOSED
CLOSED
OPENED
OPENED
OPENED
OPENED
MANUAL VALVE CONTROL
BACK
MANUAL
ZEROING &
CALIBRATE
MANUAL
SPEC TUBE
TUNING
MANUAL
VALVE
CONTROL
SYSTEM
INIT
SET-UP
GAUGE
CAL
Summary of Contents for 979 Series
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