47
Troubleshooting
4000 MiD® Instructions, V6695
10. Troubleshooting
This chapter provides information on what to do in the unlikely event that
you experience difficulty with the MiD. This list is not exhaustive if in any
doubt please contact KNAUER for assistance.
Warning
In the event that these troubleshooting guides have to
be used, please ensure that the MiD is switched off, unless other-
wise stated.
Avertissement
Dans le cas où ce guide de dépannage doit
être utilisés, s’il vous plaît s’assurer que le MID est éteint, sauf indi-
cation contraire.
Caution
Always wear eye protection and use suitable tools when
handling capillaries.
Attention
Toujours porter une protection oculaire et utiliser des
outils appropriés lors de la manipulation des capillaires.
The following table details some basic symptoms, possible causes and
potential solutions for some basic issues with the 4000 MiD.
Symptom
Possible Cause
Remedy
Cannot apply any voltages
to the spraychip® assembly.
Interlock is engaged.
Make sure the front door
is fully closed. Check the
interlock status symbol
on the Status bar.
There is a drop in ion signal
intensity; a reduction in the
value of the spray current.
Nebuliser gas flow rate
has decreased.
Check all connections
are fitted tightly.
Check the main gas
supply.
Check the O-rings lo-
cated in the spraychip
assembly for cracks. Re-
place the O-rings if there
are any cracks.
Capillary tip may be
clogged.
Change the spraychip
200 (see chapter 8.2 on
page 33).
Obstruction in ion tun-
nel.
Clean or change the
spraychip 200 (see chap-
There is a drop in ion signal
intensity; a reduction in
spray current
Air bubbles in sample
line.
Flow sample through the
system, and allow time
for air bubbles to dissi-
pate.
