Internal oxygen concentration result drops below 0.1%,
but there is considerable variation in “Self check” results.
Once the result is very low, around 0.01–0.05%, the op-
erator might see some variation in the “Self check” read-
ings so that some readings might be even > 0.1%. This is
Settings page after
Self check is performed
normal, as the concentration is so low, that sometimes
the measurement noise can cause variation. Important
thing is that most of the “Self check” measurements are
< 0.1%, as required.
5.8 Measurement problems
If unexpected inconsistent readings are received, please
check the following things:
Î
Laser temperature
Î
Internal oxygen concentration
Î
Vacuum suction holds the measuring head tightly
against the insulating glass to be measured
Î
Glass and spacer thicknesses are approximately
according to the correct expected thicknesses
Î
Try to measure close to the spacer.
Î
Do several measurements on the same IGU and
compare the results. If most of the measurements
are consistent but there are exceptional results,
repeat the measurement. The exceptional results
might be measurement errors.
Î
If there is a special reflective coating (e.g., Low-E), try
measuring from the non-coated side to get a better
signal to the sensor and more accurate results.
Î
If the vacuum does not hold the measuring head
tightly against the glass, make sure that the IG
surface is not too bent to avoid proper contact.
You can try to help the vacuum by pressing the
measuring head against the glass firmly once the
measurement has started.
Î
If glass or spacer thicknesses are shown incorrectly,
the measurement is taken from the incorrect
location and the results are not correct. The device
operator can try to help the analysis by providing
the pre-set values to the drop-down menus for glass
and spacer thicknesses on the Settings Page. When
the operator provides this information, the software
can locate the correct measurement locations more
easily.
If the problems persist, please contact
. Also, please be prepared to
have the IG structure information, coating characteris-
tics available, and the measurements data file.
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