Advertisement
Total Suspended Solids
If standards have expired or are inserted in
incorrect sequence Error 101: Incorrect
When using the Turbimeter Plus in Total
Standard may be shown.
Suspended Solids Reading mode, a calibration
After the final 800NTU standard, the screen
is required to set the relationship between
will show 'Calculating...Please wait' and a
the measured turbidity values and the 'true'
countdown will appear to show time remaining.
suspended solids value, determined by gravimetric
methods. This calibration can either be an
On completion of the process the Compact
assigned series of values from the results log
Turbimeter screen will show 'Successful'.
or a simple straight line equation with factors
Press 'Back' to leave the calibration process
provided by the user. This relationship is typically
and return to the Calibration menu.
a straight line and hence the factors consist of
To cease calibration during the data capture
a slope and intercept.
phase press 'Cancel'.
The Turbimeter Plus has two methods
To cease the calibration process at any step,
of generating the data for relating the
press 'Back' (calibration data will be discarded).
measurement of turbidity to total suspended
The time, date and Operator ID are stored in
solids (TSS):
the calibration log for GLP compliance (see
Section 4.4).
1 Correlation - Using the stored turbidity data
from the instrument log and relating it to
Formazin
manually entered Total Suspended Solids data
derived from elsewhere. The minimum number
Select 'Calibration' and press 'OK'.
of correlation points required is one as the
Choose 'Formazin' and press 'OK'.
zero point can be used as a second point. A
Acceptable fresh Formazin standards should
maximum of 50 data point pairs can be used.
be prepared within the following ranges:
2 Factor - Using data manipulated externally,
Low Standard
0.01 - 1.00NTU
a slope and intercept for the straight line
Second Standard 10.0 - 30.0NTU
relationship can be entered directly. Slope
Third Standard
90.0 - 110.0NTU
factors range from 0.1 - 50.0 and intercepts
can be set from -50.0 - +50.0.
High Standard
720.0 - 880.0NTU
Select the lowest (0.01 - 1.00) NTU standard
and insert into the sample chamber with the
Check Standard Mode
orientation mark facing forward.
Using the Check Standard Mode will allow
Use the Up/Down buttons to adjust the value on
the user to determine whether a calibration
screen to that on the standard and press 'Read'.
is required whilst providing an audit trail of
Repeat the process for the second, third and
performance for validation of results.
high standards.
To use the Check Standard mode, first assign
After the final standard, the screen will show
Check Standard Values for up to four SDVB
'Calculating...Please wait' and a countdown
standards. Use the Up/Down keys to adjust the
will appear to show time remaining.
default software values to those of the actual
On completion of the process the Compact
standards. The adjusted values will be retained
Turbimeter screen will show 'Successful'.
until updated.
Press 'Back' to leave the calibration process
Once values are assigned the Check Standard
and return to the Calibration menu.
Read mode can be used to validate the calibration
To cease calibration during the data capture
across the working range of the Turbimeter Plus
phase press 'Cancel'.
without recalibrating the instrument. Acceptable
31
Compact Turbimeter
Turbimeter Plus
To cease the calibration process at any step,
limits for standards are automatically calculated
press 'Back' (calibration data will be discarded).
by the Turbimeter Plus and results are displayed
as well as Pass or Fail and recorded in the Results
The time, date and Operator ID are stored in the
Log on completion.
calibration log for GLP compliance (see Page 40,
System menu).
If any Check Standards fail the Turbimeter Plus
check the condition of the standards and polish
Total Suspended Solids - Correlation
using the lint free cloth. Also check that they
Select 'Total Suspended Solids' and press 'OK'.
are in date. If they have recently been moved
If the Sample ID has already been created use
they may need to be allowed to stand for
the Up/Down arrows to highlight and press
10 minutes. If these all fail to produce a
'OK' to select.
pass on all standards the instrument may
need recalibration.
If a new Sample ID is required, move the
highlight to a blank area and press 'New'.
Create the new Sample ID using the Up/Down
Calibrating the Turbimeter Plus
buttons to select characters as describe in the
SDVB
'System' section.
Select 'Correlation' to enter the data entry screen.
Select Calibration and press 'OK'.
The default (0, 0) point is always included. This
Choose 'SDVB' and press 'OK'.
can be deleted or edited if not required.
Select the lowest NTU standard and insert into
Select 'Add' to recall data points from memory
the sample chamber with the orientation mark
for which a correlated suspended solids value
facing forward.
has been measured.
Press 'Select' to enter the concentration of
Use the Up/Down buttons to adjust the value on
suspended solids determined externally using
screen to that on the standard and press 'Read'.
the Up/Down buttons.
Repeat the process for the 20 NTU, 100 NTU
When data entry is complete press 'Done' and
and 800 NTU standards.
the slope/intercept will be calculated and shown
If standards have expired, are inserted in
automatically.
incorrect sequence Error 101: Incorrect Standard
Data points can be edited or deleted as required.
may be shown.
Highlight the data point of interest and select 'Edit'.
Choose either 'Edit' or 'Delete' as required.
After the final 800 NTU standard, the screen
When complete select 'Done' Press 'Back' to
will show 'Calculating... Please wait' and a
return to the 'Mode' menu.
countdown will appear to show time remaining.
On completion of the process the Turbimeter
Total Suspended Solids - Factor
Plus screen will show 'Successful'.
Select 'Calibration' and press 'OK'. Select
'Total Suspended Solids' and press 'OK'.
Press 'Back' to leave the calibration process
and return to the Calibration menu.
If the Sample ID has already been created,
use the Up/Down arrows to highlight and
To cease calibration during the data capture
press 'OK' to select.
phase press 'Cancel'.
If a new Sample ID is required, move the highlight
To cease the calibration process at any step,
to a blank area and press 'New'.
press 'Back' (calibration data will be discarded).
Create the new Sample ID using the Up/Down
buttons to select characters as describe in the
The time, date and Operator ID are stored
System section.
in the Calibrations Log for GLP compliance.
4
4
31
35
Advertisement
