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7. TROUBLESHOOTING
/ MAINTENANCE
7.1. Self-help
7.1.1. Prevention of valve sticking after lengthy non-use
With the dispensing unit screwed on, ensure that the valves
are surrounded by liquid. With the dispensing unit screwed
on, ensure the valve system is easy to move by rinsing it
with distilled water and/or laboratory cleaning agent.
A concluding rinse with alcohol assists this measure.
7.1.2. What to do if ...
· Piston is difficult to move:
Check whether crystals have formed, and if so carry out
intensive cleaning.
· Dispensing not possible:
Check the dispensing valve and clean it if necessary.
Check that the lever (12) is set to Dispense (q).
· Intake not possible:
Check the volume setting.
Check the intake valve and clean it if necessary.
· Air bubbles appear in sucked-in liquid:
Check whether all air has been removed from the
instrument, see 2.2. Check the intake tube, if necessary
shorten it or replace it. Reagent must be sucked in slowly
and steadily. Check the intake valve, if necessary clean it
or replace it.
7.2. Sending in for repair
IMPORTANT: Please clean the instrument carefully, as
described in Section 3. On no account send in instruments
filled with reagent! Sent-in instruments can only be
checked and repaired if they have been carefully cleaned
and decontaminated beforehand. Forced opening of the
instrument invalidates any warranty claim. Enclose with
the sent-in instrument a description of the trouble that has
occurred and specify which reagents were used.
14 14
8. CALIBRATION / ADJUSTMENT
8.1. Calibration
Liquid: double-distilled water, reference temperature:
20°C, constant, liquid and instrument Number of
determinations: 10
1. Dispense and weigh the maximum volume 10 times.
2. Convert the mean value of these weighing results into a
volume.
3. Compute the systematic measuring error (%) and
random measuring error (%).
The test procedure is described in DIN EN ISO 8655/6.
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