2 cleaning valve disc and distributor disc, Cleaning valve disc and distributor disc, Figure 28 – Metrohm 807 Dosing Unit User Manual
Page 40: Valve disc in the cylinder base, Figure 29, Distributor disc with 4 ports (in the distributor)
4.1 Care and upkeep
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807 Dosing Unit
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Clean the dosing cylinder and piston with a liquid cleaning agent. Do
not use any abrasive cleaning powder which could scratch the cylinder.
Afterwards, rinse the individual parts with plenty of deionised (or distil-
led) water.
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Check the piston and cylinder for any changes once more before
assembling the dosing unit. If the dosing cylinder should exhibit
scratches or rough areas, then it must be replaced together with the
piston.
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You should grease the dosing piston lightly in order to guarantee pre-
cise dosings. Using your finger, carefully apply a trace of paraffin
grease 6.2803.010 to the exterior of the sealing lips of the piston.
Wipe off excess grease with a soft, lint-free cloth.
4.1.2
Cleaning valve disc and distributor disc
Figure 28
Valve disc in the cylinder base
Figure 29
Distributor disc with 4 ports (in the distributor)
The valve disc and distributor disc must also be checked regularly. Block-
age of the valve opening or of the outlet port is to be avoided under all
circumstances.