UltraScan PRO Supplemental Manual for EasyMatch QC Ver. 2.0
17
UltraScan PRO Functions
The UltraScan PRO must be standardized on a regular basis to keep it operating properly.
Standardization sets the top and bottom of the photometric scale. During standardization, the bottom
of scale is set first. For this, you simulate the case where all the light is absorbed by the sample. For
UltraScan PRO, the bottom of scale is set with the light trap for reflectance. The light blocker (a.k.a.
black card) is used to set the bottom of scale for transmittance measurements.
Top of scale is then set by scaling the light which is reflected or transmitted to a calibrated standard.
This is done using a calibrated white tile for reflectance measurements. For top of scale in
transmittance, you are prompted to place the white calibrated standard at the reflectance port.
Alternatively, a plug of barium sulfate (BaSO
4
) or magnesium oxide (MgO) may be used to more closely
approximate the actual sphere wall reflectance. When taking transmittance measurements, the
calibrated white tile or the plug used during standardization must be kept at the reflectance port.
When the instrument is to be used for transmittance measurements of liquids, a clear liquid (distilled
water for water-based samples, toluene or benzene for resins, or mineral oil for oils) in a cell of the
desired size should be used to set the top of the scale.
It is recommended that the instrument be standardized at least once every eight hours. Also,
standardize the instrument whenever the hardware changes, such as the placement of the UV filter or
with any environmental changes, such as temperature.
Sensor > Standardization
Four modes of measurement are available when you standardize the UltraScan PRO:
•
RSIN: Reflectance - Specular Included
•
RSEX: Reflectance - Specular Excluded
•
TTRAN: Total Transmittance
•
RTRAN: Regular Transmittance
With varying hardware configurations such as UV filter in/out and the different areas of view, there are
many ways to standardize the UltraScan PRO. The instrument can be standardized at any time by
selecting
SENSOR > STANDARDIZE
or by clicking the
STANDARDIZE
button on the default toolbar. You
are first prompted to indicate the instrument configuration.
Place the cell in the transmittance compartment as
close to the sphere
as possible for measuring total
transmittance. Place it as close to the
lens
as possible when measuring regular transmittance.
