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4. GETTING STARTED

Page 29

4.8

SETTING UP THE VLPC

The following procedure will connect the VLPC to the FPG. The VLPC and the FPG will use the same
bottle and downstream regulator for the supply pressure. When placing the VLPC next to the FPG,
ensure that the provided PFA tubes will reach the appropriate parts. If the tubes do not reach, move the
VLPC closer to the FPG. It is assumed that the FPG piston has already been inserted into the mounting
post at this point. Refer to Section 4.4 for VLPC connections.

Place the VLPC on the right side of the FPG approximately six inches away.

Attach the Test (Lo) port from the VLPC to the Control Low port on the FPG manifold. Use the 1/4 in.

PFA tubing with the VCO connection on one end. Before connecting the VCO connection, ensure
that the O-rings are attached to the Test (Lo) port on the back of the VLPC.

Attach the Test (Hi) port from the VLPC to Control High port on the FPG manifold. Use the 1/4 in.

PFA tubing with the VCO connection on one end. Before connecting the VCO connection, ensure
that the O-rings are attached to the Test (Hi) port on the back of the VLPC.

Attach the FPG Vacuum port from the VLPC to Vacuum port on the FPG manifold. Use the 3/8 in.

PFA tubing with the VCO connection on one end. Before connecting the VCO connection, ensure
that the O-rings are attached to the FPG Vacuum port on the back of the VLPC.

Attach the 700 kPa (100 psi) regulated pressure to the “Supply” port on the back of the VLPC. Do

this by using 1/4 in. PFA tubing that has been teed off from the output of the regulator downstream
from the bottle.

Attach drive air to the external port labeled “Drive Pressure” on the rear panel of the VLPC. The drive

pressure should be between 620 to 760 kPa (90 to 110 psi).

4.9

INTRODUCING GAS TO THE FPG

When the FPG is vented or the bottle has been turned off, the lubrication pressure must be reintroduced.
The steps below describe the proper sequence for a safe introduction of gas to the FPG. If not done
properly, a reverse pressure situation can be created that can contaminate the system.

Introduce drive air to the VLPC and FPG.

Make sure that the 700 kPa (100 psi) regulator is shut off before turning the bottle pressure on.

Turn on the bottle pressure.

Adjust the regulator to 700 kPa (100 psi). The gas will flow through the water in the bubbler.

The noise caused by the gas flow through the bubbler is normal. The lubrication gas flowing into the
lubricating volume and the surrounding piston creates the bubbles. By forcing the gas through the

bubbler, the FPG is capable of controlling the humidity of the gas regardless of the humidity of the

source gas.

The gas will fill the lubricating volume to approximately 40 kPa (5.8 psi) above atmosphere.

Start FPG Tools software (if not already active) and choose

[Run], [Run Monitor]

Verify that the FPG is level. Use the bubble level on the top of the FPG and make adjustments with
the rear feet as necessary.