Troubleshooting - BRAND Dispensette S Instrucciones De Manejo

The valves, telescoping filling tube and discharge tube contain reagent!
Contact with potentially hazardous media is possible.
> Clean the instrument before the discharge tube, valves or dosing unit are exchanged.
> Do not disassemble the dosing unit.
> Follow the safety instructions (Safety Instructions, p. 34).
A functional test must always be carried out after exchanging components.

10 Troubleshooting

Problem
Liquid is above the piston Piston leaky
Piston sluggish
Filling not possible
Dispensing not possible
9974 91
WARNING
NOTICE
a.
Completely unscrew the retaining ring of the dispensing
cartridge by hand and remove the dispensing cartridge.
b.
Insert a new dispensing cartridge into the valve block
and tightly screw on the retaining ring by hand.
c.
Perform a functional test for leaks.
Factory adjustment
The dispensing cartridge is pre-adjusted in the factory.
Therefore, calibration is not necessary after replacement.
> Before using the instrument, rinse thoroughly and discard
the first dispensed volume.
> Avoid splattering.
> Perform cleaning for trace analysis, depending on re-
quirements (Cleaning for trace analysis, p. 50).
> Disassembly of the dispensing cartridge is not permitted!
Possible cause
Crystal deposits, contami-
nation
Volume setting screw at
the lower stop
Filling valve stuck
Discharge valve stuck
NOTICE
Corrective action
Perform standard cleaning (Standard clean-
ing, p. 49), replace dispensing cartridge (Re-
placing the dispensing cartridge, p. 52).
Stop dispensing immediately. Perform stan-
dard cleaning (Standard cleaning, p. 49).
Set the desired volume (Dispensing, p. 42).
Clean the filling valve. If the valve ball is stuck,
use a 200 µl plastic tip to dislodge it (Dislodg-
ing a stick valve ball, p. 52). If necessary, re-
place the filling valve.
Unscrew the discharge valve from the valve
block and
clean it. If the valve ball is stuck, use a 200 µl
plastic tip to dislodge it. If necessary, replace
the filling valve (Replacing the discharge
valve, p. 51).
10 Troubleshooting
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Operating manual