Diatron MI PLC
rev 1.09
74
8. MAINTENANCE
8.1. Weekly Maintenance by User
User should carry out on the first workday, before starting up the analyzer.
8.1.1. Cleaning the washing head
User should clean the lower surface of the sampling needle washing head using a
soft cloth, immersed in warm tap water to remove salt build-up.
8.2. Periodic Maintenance by Service
The instruments should be checked and maintenance must be carried out in every 6
months, or after 10 000 measurement cycles.
8.2.1. Check Self test and Device statistics
Run the built-in Self test and check the overall test result. Check the device statistics
to find common problems.
8.2.2. Cleaning and Greasing Dilutor Block
The dilutor block driving wheels and gear bar should be cleaned from dirt and must
be greased with A597 grease between the gear bar and the support, and between
cogged wheels.
8.2.3. Checking and Lubricating Dilutor Piston Tips
The cogged end of PTFE dilutor pistons should be cleaned and lubricated by neutral
silicon grease, A599. Apply just a thin layer, and move it along the perimeter of the
piston, so that some of the material goes into the gaps between the sealing rings.
Repeat this step for lyse and dilutor pistons as well. Check the condition of the micro
piston sealing, and replace if necessary.
8.2.4. Cleaning and Lubricating Needle Moving Mechanics
The H&V moving mechanics sliding bars should be cleaned from dust.
Lubricating of the sliding bars must be made using A598 Photolube, oil containing
PTFE.
Grease or pure lubricating oil is not suitable.
8.2.5. Checking and Replacing Washing Head
Check the state of the washing head, and replace if necessary. After replacing
washing head, do not forget to perform correct adjustment of sampling needle height
(see Section 4.1.2).
8.2.6. Checking and Replacing Peristaltic Pump Tube
Replace peristaltic pump tube if needed. You can check it by opening the lock, and
removing the tube for inspection.
Check for leakage of the tubing. Reassemble the head.
