Parameter Flags
34 03-11-24 1002en01
4.1 TU (Time-out Upper Detector)
The error flag TU might be displayed on the following parameters: RBC, PLT
and/or WBC. This error is related to the counting time. It means that the count-
ing time is outside the limits and displayed as “HI” or “LO”.
Note:
The instrument performs an auto-clean of the orifice after a TU is displayed; a
re-analyze of the sample might cancel this warning in most cases.
See Maintenance, Shut-Down & Transport on page 95. See also Trouble
Shooting on page 99.
4.2 TL (Time-out Lower Detector)
The error flag TL might be displayed on the following parameters: RBC, PLT
and/or WBC. If the system is unable to move the liquid level in the metering unit
up to the lower detector, this error is reported. No counting time is displayed in
this case. Most probably this is caused by a clogged aperture (orifice).
Note:
That the orifice is cleaned automatically and that in most cases a re-analyze of the
sample will cancel this clogging.
See Maintenance, Shut-Down & Transport on page 95. See also Trouble
Shooting on page 99.
4.3 SE (Statistical Error)
The error flag SE might be displayed on RBC/PLT /WBC and/or HGB.
During the analysing process, clumps of cells, partial blockages or other distur-
bances might affect the statistical accuracy of the displayed number of cells.
Therefore the analyzer checks the count/time ratio continuously and if this num-
ber/time ratio is strongly fluctuating, the parameter will be flagged with the SE
mark. 'SE' on the HGB parameter is related to an unstable extinction during the
blank and/or sample measurement.
Most probably the shown result will not be correct and the sample should be re-
analyzed.
See SE (Statistical error HGB) on page 36.
4.4 DE (Distribution Error)
This warning flag is related to the floating upper discriminator of the PLT size
distribution curve. The software analyzes the number of cells on the right-hand
side of the position of the upper discriminator in respect to the total number
within the size distribution curve. If a large population of cells is found in this
area, it usually means that no correct minimum can be found between the RBC
and PLT distribution. The reason for this might be an incorrect setting of the
floating discriminator or an incorrect setting of a fixed discriminator as done in
the “Discriminator set-up” in the set-up menu. However, on pathological sam-
ples with low PLT values this effect might occur even if the analysis is correct.
The PLT values are probably correct within 20% of the actual value. In case of
extremely low PLT values, this DE mark can be seen as a warning. In case of nor-
mal PLT values, it should be seen more as an error flag. A DE flag is also possible
on the WBC parameter. In such case the size-distribution curve is too far shifted
left, probably due to pathological sample. Another possibility is the presence of
aggregated PLTs, which might interfere with the LYMF region.
See Limitations on page 18.
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