Check Analysis Manifold Outgas Rate

  1. Close the supply valves (Nupro valves) on the gas inlet lines.

  2. Insert leak tight plugs in unused gas inlet ports.

  1. Go to Unit [n] > Enable Manual Control. Ensure a checkmark displays to the left of the menu item. If the analyzer schematic does not display, go to Unit [n] > Show Instrument Schematic.
  2. Open valves 18, 8, 17, and 7.
  3. Set the servo valve to dose to 1000 mmHg to ensure that it stays open.
  4. Evacuate the inlet ports by opening valves 21 to 26.
  5. Evacuate a minimum of 20 minutes. Overnight evacuation is preferable.
  6. Close valves 8 and 18.
  7. Record the pressure as the Initial Reading for Inlet Ports in the following table:

Test

Initial
Reading
3 Min.
Reading
Difference Limits OK?
Inlet Ports       30 μ
(0.3 mmHg)
 
Valve 21       21 μ
(0.0021 mmHg)
 
Valve 22       21 μ
(0.0021 mmHg)
 
Valve 23       21 μ
(0.0021 mmHg)
 
Valve 24       21 μ
(0.0021 mmHg)
 
Valve 25       21 μ
(0.0021 mmHg)
 

Valve 26

      21 μ
(0.0021 mmHg)
 
  1. Wait 3 minutes, then record the pressure as the 3 Minute Reading in the table.
  1. Subtract the first reading from the second reading and record in the Difference column.
  2. If the value in the Difference column is at or below the value in the Limits column, enter Yes in OK? Column. If the Difference value is not below the Limits value, a gas inlet valve, inlet plug, or gas line is leaking from atmosphere.
  3. Close all gas inlet manifold valves (21 through 26).
  4. Record the pressure as the Initial Reading, then begin timing as soon as the next step is completed.
  5. Gas inlet valves 21 through 26 must remain closed during this procedure. Pressurize the inlet to valve 21 by opening the supply valve or removing the port plug. This allows gas or air to pressurize the inlet valve above the seat.
  6. After 3 minutes, record the pressure as the 3 Minute Reading. Subtract the first reading from the second and record in the Difference column.
  7. Repeat steps 14 through 16 for the inlet valves 22 through 26.