Troubleshooting
multi EA 5000
124
Error
Possible cause
Remedy
¡
Rinse the syringe
thoroughly with ul-
trapure water after
each cleaning step
Water traps clogged
¡
Service life expired
(> 6 months)
¡
Replace the water
traps
¡
Do not analyze any
samples that form
aerosols
¡
Only acidify samples
with hydrochloric acid
¡
Water trap capacity
exhausted due to ex-
cessive aerosol for-
mation
13.18 Analytical problems during TC, EC/OC, TOC, NPOC and TIC determination
TC and EC/OC determination in organic liquids, in solids and in gases:
Error
Possible cause
Remedy
Scattering measurements
¡
Inhomogeneous sam-
ple matrix or sample
matrix containing
particles
¡
Warm up cold sam-
ples
¡
Homogenize sample
before analysis
¡
NDIR baseline drift
¡
Unfavorable integra-
tion criteria: Integra-
tion canceled to early
¡
Check settings
¡
Increase the maxi-
mum integration
time
¡
Sample unsuitable for
vertical operation
mode (droplet forma-
tion)
¡
Use the horizontal
operation mode
¡
In vertical operation
mode: Quartz wool
not present or at the
wrong position in the
combustion tube
¡
Check the position of
the quartz wool, ad-
just as necessary
¡
Sample evaporates
before dosing
¡
Use a cooled sampler.
¡
Sample too viscous
too be drawn in with-
out air pockets
¡
Use the horizontal
operation mode and
dilute the sample, or
dose directly as a
solid.
¡
Inhomogeneous sam-
ple or sample con-
taining particles
¡
Homogenize sample
Low results
¡
CO
2
concentration
outside of the operat-
ing range of the NDIR
detector
¡
Reduce sample vol-
ume/amount
¡
Dilute samples
