Page 70 - PBL71 OI/AXM630-EN AZTEC 600 SS (WIRO)

Aztec 600 ISE ammonia and fluoride
Single-stream ion-selective analyzers
13 Maintenance
3.
Referring to Fig. 13.2:
Note. During step q, it is very important to ensure that:
– the pump tubing is not pinched
– the pump tubing remains correctly located over the pump capstan rollers
– each tube enters its respective groove in the pressure plate
– the sleeves and shims remain in position
66
OI/AXM630–EN Rev. J
a.
b.
c. d.
e.
f. g.
h.
i.
j.
k.
l. m.
n. o.
p.
Press down on pump pressure plate C, turn pressure plate locking pin D 1/4 turn counter-clockwise and withdraw the pin. Lift the pump pressure plate clear of the pump.
Disconnect the heated block assembly inlet tube (Ammonia analyzer only) or mixer assembly inlet tube (Fluoride analyzers only) E from tee-piece F and pull tee-piece, reagent and sample tubes free of slots in lower support plate.
Disconnect sample pump tube G from the valve manifold connector.
Disconnect reagent pump tube H from the in-line mini barbed nipple connector located below the lower valve manifold.
Remove shims J and sleeves K, complete with pump tubing and tee-piece from the lower support plate and discard the complete assembly.
Remove pump capstan securing screw and washers L.
Remove nameplate M, front pump capstan, center spacer and rear pump capstan. Discard the 2 x pump capstans.
Fit new rear pump capstan to pump drive shaft, followed by the center spacer and the new front pump capstan, ensuring pump rollers are aligned. Fit nameplate M and secure with screw and washers L.
Fit new sleeves K to new reagent H and sample G pump tubing (hold the hole in the sleeves open with a pair of long-nosed pliers while pushing the tubes through).
Insert sleeves K and pump tubing into the lower support plate, ensuring the thin (reagent) tubing H is fitted to the rear location and the thick (sample) tubing G to the front. Route end of reagent tubing H through holes in valve manifolds.
Fit reagent and sample pump tubing to new tee-piece part no. 26-1003-B F as shown. Slide tubing into correct slot in lower support plate.
Fit new shims J to the slots in the support plate as shown.
Gently pull the new tubing down through sleeves K and into contact with pump rollers. Ensure tee-piece F is positioned under the lower support plate as shown and reagent tubing H is correctly routed through holes in valve manifolds.
Ensure the tubing is aligned correctly over the rollers.
Ensure pump tubing sleeves K and shims J are located correctly in pump lower plate as shown.
Ensure pump pressure plate locking pin D is not protruding from the rear face of the pump pressure plate C.
q.
r. s.
Position the pump pressure plate over the pump tubing and capstans and press down firmly until fully home.
Press locking pin D fully home and turn 1/4 turn clockwise to lock the pump pressure plate in position.
Connect sample pump tube G to the valve manifold connector.
Note. DO NOT reconnect tubes E and H at this stage – they are reconnected during steps 3 and 7 or 8 in Section 13.3.2.