Endress+Hauser Analytik Jena multi EA 5000 - Analytical Problems During TC, EC;OC, TOC, NPOC and TIC Determination

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