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4
Compact Turbimeter
4.4.12 LCD Contrast
The default setting is appropriate for all but the
most challenging light conditions but, should it
become necessary, the contrast setting for the
LCD screen can be manually adjusted.
Use the Up/Down buttons to adjust the image
on screen until the alternating shapes are clearly
visible and press ‘Back’.
4.5 Reading Menu
When taking readings ensure the cuvette is free
from dirt, dust and condensation using the supplied
lint free cloths.
Ensure the light cap is in place to prevent stray
light from adversely affecting readings. If no light
cap is fitted or the sample cuvette is not correctly
inserted Error 107: Blanking Error will be reported.
Microscopic scratches on the sample cuvette
will refract light and can lead to higher than
expected values.
To prevent scratches having an impact apply a thin
film of silicone oil (provided) to the sample cuvette.
Select the ‘Reading’ menu and choose from:
Normal - This mode reads the turbidity of the
sample in approximately eight seconds with an
audible beep at the start and finish of measurement.
Average - Selecting this mode prompts a further
choice of Short Average (3 readings), Medium
Average (6 readings) and Long Average (12
readings). Averaging readings is extremely useful for
turbidity measurement where particles are in motion
or where extremely high accuracy is required.
Continuous-Capture
This mode allows continuous reading of sample
turbidity until measurement is manually interrupted.
This mode will support cuvette indexing and
settling studies on rapidly settling samples.
Total Suspended Solids
The relationship between turbidity and suspended
solids can be approximated with correlated data.
The QuadoptiX™ bench provides the performance
required to produce reliable data for suspended
solids, based on calculated factors (slope and
offset) for turbidity versus suspended solids.
Default factors are not possible due to the unique
variety of size, shape and reflectivity of individual
sample matrices.
Calculated factors will provide a rapid qualitative
value for Total Suspended Solids that will be relevant
until process conditions change. This reading
mode will only become active upon a site specific
calibration being stored in the Compact Turbimeter.
4.6 Taking Readings
Normal Mode
Choose ‘Reading’ mode, select ‘Normal’
and press ‘OK’.
Insert the sample with the orientation
mark facing forward and press ‘Read’.
A beep will sound at the start and end
of measurement.
Result is displayed and stored in the results log
with date, time, Operator ID and Sample ID.
(NOTE: See the ‘System’ section for details
of the result log).
Average Mode
Choose ‘Reading’ mode, select ‘Average’
and press ‘OK’.
Select the number of readings required for the
averaging function:
Short Average - 3 consecutive readings
Medium Average - 6 consecutive readings
Long Average - 12 consecutive readings
Insert the sample with the orientation mark
facing forward and press ‘Read’.
The instrument will beep at the start and end of
measurement cycle. Result is displayed on the
screen and stored in the log with time, date,
Operator ID and Sample ID.
Continuous-Capture Mode
Choose ‘Reading’ mode, select ‘Continuous-
Capture’ and press ‘OK’.
Insert the sample with the orientation mark
facing forward and press ‘Read’.
A beep will occur at the start and end of each
measurement cycle.
To store data in the log, press
‘Capture’
(repeat as required). To cease measurement,
press ‘Back’ at any time.
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