YOKOGAWA WE440, User Manual

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<8. Maintenance Schedule>
8-4
IM 12Y18A04-01EN 1st Edition : Oct. 04, 2019-00
STEP 5:
Insert the retainers into slots in pump housing and ensure it secure properly.
STEP 6:
Apply two or more drops to the tubing of silicone oil on the pump cover and install on the
pump head.
STEP 7:
Repeat the process to all other pumps.
Note: The Sample Pump has a large diameter tubing.
8.3 Cleaning the Reaction Cell
Noisy or unstable readings may be caused by debris floating in the reaction cell or from deposits
on the optical windows inside the reaction cell. Check the reaction cell and clean as needed.
Make sure that the stir bar is clean and moving freely, all tubing is secured and in good condition.
CAUTION
Always Wear Protective equipment
Press STOP → MENU → MEASUREMENT → CLEAN (flush the reaction cell with sample)
Press STOP → MENU → SERVICES → PRIME FLUIDICS
Set PRIME VOLUME to -5.0 ml and PRIME SAMPLE (note negative sign, this will empty out the
cell).
Remove reaction cell cap and deposit cleaning solution into the reaction cell, you can use a 10 ml
syringe to fill the cell with cleaning solution and let it soak for about ½ hour.
For a more thorough cleaning, swing the reaction cell down as shown in photos below and use a
non-fiber swab with a bent tip, reach inside the reaction cell and wipe the side optical windows of
the cell and the inner surfaces to dislodge and remove any deposits.
Cleaning of the reaction cell should be performed monthly or as needed to remove any debris or
deposits that may be created by the reacted solution or caused by the process sample. Deposits
on the optical windows increase the surface tension attracting small air bubbles generated from
the chemical reaction.
Note that if the analyzer is set for Auto-Restart you do NOT have to wait after leaving the cleaning
solution in the reaction cell, the analyzer will automatically start running after ½ hour.
You may repeat the cleaning procedure as needed.