Perform a Leak Test

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.
Prepare for the leak test:

This test must be performed in the order provided to ensure the analyzer is fully tested.

Preparation Gas Path Leak Test

This tests all fitting connections in the gas flow path and part of the analysis valve.

Observe the preparation gas MFC reading as it slowly drops to zero. A flow reading of zero indicates the flow path between the preparation gas MFC and the preparation exhaust does not leak.

To fix a leak that may be indicated on the preparation gas MFC, tighten the fittings in the gas flow path and observe the reading for any decrease that would indicate that the leak has stopped.

Any leak detected in the remaining steps of this procedure may be fixed by using the same process mentioned in Step 5.

This tests all fitting connections in the gas flow path and the reference side of the thermal conductivity detector.

Valve positions need not be preset for this test.

Right-click the helium reference valve and select Open.
Plug the reference gas exhaust outlet.
Observe the reference gas MFC reading as it slowly drops to zero. A flow reading of zero indicates the flow path between the reference gas MFC and the reference gas exhaust does not leak.

Right-click the trap valve and select Bypass.
Right-click the analysis valve and select Preparation.
Right-click the blend valve and select Bypass.
Right-click the loop valve and select Fill.
Set the helium regulator to less than 5 psi (34.5 kPag).
Right-click the helium carrier valve and select Open.
Plug the analysis gas exhaust outlet.
Observe the carrier gas MFC reading as it slowly drops to zero. A flow reading of zero indicates the flow path between the carrier gas flow MFC and carrier gas exhaust does not leak.
Right-click the loop valve and select Inject.
Observe the carrier gas MFC reading as it slowly drops to zero or remains at zero from the previous test. A flow reading of zero indicates the flow path between the carrier gas MFC and the carrier gas exhaust outlet does not leak. This tests all fitting connections in the gas flow path, the remaining parts of the loop valve, and the loop.

Observe the carrier gas MFC reading as it slowly drops to zero or remains at zero from the previous test. A flow reading of zero indicates the flow path between the carrier gas MFC and the carrier gas exhaust outlet does not leak. This tests all fitting connections in the gas flow path, the sample tube, and the remaining parts of the analysis valve.

Install a sorption trap, cold trap, or delay line on the trap port.
Right-click the trap valve and select Trap.
Observe the carrier gas MFC reading as it slowly drops to zero or remains at zero from the previous test. A flow reading of zero indicates the flow path between the carrier gas MFC and the carrier gas exhaust outlet does not leak. This tests all fitting connections in the gas flow path, the remaining parts of the trap valve, and the trap.

This test is applicable only if the vapor generator option is installed on the analyzer.

Right-click the loop valve and select Inject.
Right-click the vapor valve and select Bypass.
Right-click blend valve and select Bypass.
Plug the loop gas exhaust outlet.
Plug the vapor generator gas exhaust outlet.
Right-click the helium loop valve and select Open.
Observe the loop gas MFC reading as it slowly drops to zero. A flow reading of zero indicates the flow path between the loop gas MFC and loop gas exhaust outlet does not leak.

Install an empty flask onto the vapor generator port.
Right-click the vapor valve and select Vapor.
Observe the loop gas MFC reading as it slowly drops to zero or remains at zero from the previous test. A flow reading of zero indicates the flow path between the loop gas MFC and the loop gas exhaust does not leak. This tests all fitting connections in the gas flow path, the remaining portions of the vapor generator valve, and the relief valve in the vapor generator.

Right-click the loop valve and select Inject.
Right-click the blend valve and select Bypass.
Plug the loop gas exhaust outlet.
Right-click the helium loop valve and select Open.
Observe the loop gas MFC reading as it slowly drops to zero or remains at zero from the previous test. A flow reading of zero indicates the flow path between the loop gas MFC and the loop gas exhaust outlet does not leak. 1This tests all fitting connections in the loop gas flow path and the tubing to the loop valve.