Instructions on how to remove and clean the Zeeman Centerblock
Window
Tools needed:
Screwdriver (Philips or flat blade depending on the screws present)
13mm Wrench, supplied with furnace
Dime
Cleaning supplies (de-ionized water and either sodium carbonate or
sodium bicarbonate)
Lens papers or laboratory wipes
Turn off the furnace power supply and unplug the power cables for the furnace
power supply. There are two power supply cables attached to the furnace.
Remove the furnace autosampler and set it securely on a bench. Tilt the furnace
head forward. Locate the cover on the left side of the furnace head as shown in
the picture below. Remove the two screws which hold the cover on. Remove
the cover.
Cover
Screws
Scientific Instrument Division
5225 Verona Road
Madison, WI 53711
1-800-532-4752
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Once the cover is removed the hoses and wires which are attached to the center
block are freed up and exposed. They will be helpful in removing and reinstalling the centerblock. See the picture below.
Hoses and wires
for centerblock
Tilt the furnace back into the upright position. Locate the magnet bolt as shown
in the picture below and remove it using the 13mm wrench. The bolt will need to
be complete loosened and removed by pulling it towards you.
Magnet bolt
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The furnace head can now be tilted forward again. (NOTE: The front magnet is
very heavy and may drop forward when the furnace head is tilted. Hold the
front magnet securely and allow it to drop slowly).The magnet is attached to
the furnace head by a hinge mechanism. The front part of the magnet will drop
down and be held there by gravity. The back part of the magnet is lifted up and
the magnet latch is lifted upwards to hold the magnet in place. Be careful not to
press the magnet latch accidentally as the magnet is heavy and could drop
suddenly if the latch is dis-engaged.
Magnet latch
Open the door latch and remove any cuvettes which are still in the furnace head.
The center block will now slide to the right. It is not bolted in but only held on two
pins.
Back magnet
Furnace door
Center
block
Front magnet
Door latch
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See the two pins in the picture below. The window and lens shown in the picture
is where the fiber optic is located for maintaining accurate temperatures within
the cuvette. This window and lens should be cleaned before the center block is
re-installed. Slide the center block to the right. You may need to guide the
hoses and wires through the holes in order to make the removal of the center
block easier. Make sure that no hoses are pulling off any fittings or crimped
during the process.
Center
block pins
Fiber optic lens
Locate the window retaining ring as in the picture below. There are two notches
cut in opposite sides of the ring. A dime will fit into the notches and act as a
screwdriver to remove the threaded retaining ring. The window is not attached to
the retaining ring so be careful when finally removing the retaining ring.
Retaining
ring
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The center block can now be tilted so that the window and be removed. See the
window and retaining ring in the picture below.
Retaining ring
Window
The window can now be cleaned by washing with DI water. You may need to
use a past made from sodium bicarbonate or sodium carbonate to scour the
window clean. Follow that with DI water and dry the window.
The furnace head is re-assembled by following the steps in reverse.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
Place the window inside the window compartment.
Screw in the retaining ring using the Dime.
Slide the Zeeman Center Block to the left onto the two pins. Guide
the hoses so that they do not kink or crimp.
Hold the back magnet and release the magnet clamp. Slowly lower
the back magnet into place.
Close the furnace door
Stand the furnace head upright.
Close the front magnet.
Insert and tighten the magnet bolt. While tightening the bolt make
sure to hold the center block to the left, firmly seating it on the pins,
even though the furnace door is closed. The bolt should be only
finger tight then tighten 1/4 turn with the 13mm wrench.
Replace and screw down the side cover panel.
Plug the Furnace power cords back into the appropriate
receptacles.
Replace the cuvette into the furnace head.
Reposition the autosampler.
The unit can now be turned on and normal operation resumed.
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