Instruction manual

High Throughput Diffusion Pumps

DRAFT 12/23/04

To reassemble the jet:

1. If the center jet rod was removed or loosened during

disassembly, thread the rod back into the boilerplate.

The top of the rod should be roughly 1/16" to 1/8"

below the top surface of the inlet flange (inlet plane

of the pump). Once properly located, use the nut

near the boilerplate to lock the rod in place.

2. Reassemble the lower stages by stacking them

(outside the pump body).

3. Lower the second stage and fractionating tube into

the lower jet assembly, aligning the two slots on the

tube with the frame of the jet base. Ensure that the

slots are engaged by attempting to rotate it.

4. Install the second stage jet shield.

5. Install the tie rods through the two holes in the cross

member and thread them into the frame on the jet

base.

6. Thread the two nuts on the tie rods. The height of the

tie rods should be adjusted as needed by threading

them into the frame of the jet base such that the rods

extend above the nuts by roughly 1/8".

7. Using the cross member and the appropriate lifting

equipment, lower the entire jet assembly into the

pump body, over the center jet rod.

8. Reverse steps 1 through 3 above to reassemble the

upper jet components.

CAUTION Do not over tighten the nuts on the tie

rods. Doing so will distort the cross

member,. The rods are meant to hold

the assembly together during

installation in the pump.

CAUTION If the pump has been equipped with a

thermowell near the bottom of the

pump body, there is a corresponding

slot in the jet base for clearance around

the thermowell. Ensure that the slot

engages the thermowell to avoid

damage to the thermowell and jet.

NOTE The hex nut is installed such that the

small diameter acts to center the cold

cap or halo baffle. Ensure that the hex

nut is not installed upside down.