Analytik Jena multi EA 4000 - Analytical Problems; C;S Detection

Fault removal
multi EA 4000 Version 01.16 115
9.6 Analytical problems
9.6.1 C/S detection
Recovery generally too low
Cause
Solution
− Drying agent too moist
− Filter and measuring gas hoses
sooted up
− Check and replace the desiccant
− Check and replace the filter
− Check dust trap, if heavily contaminated (par-
ticle deposits), clean dust trap and replace
measuring gas hose up to the filter
Too low results in TS
Cause
Solution
− Halogen trap still in measuring gas
flow
− Replace halogen trap with an empty glass
tube
− Digestion temperature too low
(especially for sulfate bonding
form)
− Increase furnace temperature in the method,
if S measuring graph look very irregular or
has a long trailing and does not reduce to the
base line.
− If necessary, add additives (e. g. iron phos-
phate, tungsten oxide, vanadium pentoxide,
tin…).
− Contamination of the hoses carry-
ing the measuring gas up to the
optics
− Remove hoses up to the NDIR optics, clean,
dry and re-install them.
Note:
We recommend to have the cleaning of the
hoses carried out by Service.
Excess results during TC
Cause Solution
− Combustion tube has a crack or is
broken
− Ambient air can enter through the cracks into
the system and may cause significant excess
results in TC. ⇒ Replace combustion tube
Base line drift
Cause
Solution
− Detector not stable
− The detector must stabilize during the warm-
up phase of the device. Therefore, it may
happen at the start of measuring that the base
line still drifts a little (temperature depend-
ence). The peak area changed due to the drift
will be corrected automatically, thus the
measuring results are never affected.
− If the drift does not stop, inform Service.