Macherey-Nagel PF-12 Plus - Calibration Adjustment Procedure; VISOCOLOR ECO Test Procedures

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04.07.2014
5.2.15 Calibration adjustment (Method 962)
The PF-12
Plus
device is provided with the MACHEREY-NAGEL factory calibra- tion
and can be readily used without any need for user calibration. The calibra- tion
adjustment tool can be used to meet regulatory requirements. Therefore the
factory-provided calibration of the VISOCOLOR
®
ECO and NANOCOLOR
®
methods can
be
adjusted with a standard in the menu “calibration adjustment”. The parameter including
submethod to be adjusted is chosen via the four digit entry mask (e.g. 0291 for COD 1500
100–1500 mg/L). Place the tube with the zero value or the reagent blank into the cuvette slot
of the PF-12
Plus
and press to start the zero measurement. Subsequently place the tube
with the standard into the device and press
to start the measurement. Enter the desired
value for the standard with the keypad and confirm your entry with
(Note: The entered
value must be within the measurement range of the respective submethod, otherwise the
entry will not be adopted). The changed calibration will be stored automatically and will be
executed the next time the concerned method will be chosen. The changed calibration will
be indicated in form of a star behind the respective test name. When stored, the results
measured with an adjusted calibration will be indicated with a star, too. The calibration ad-
justment can be deleted and set back to factory calibration by pressing
in the same menu.
The measurement values in the memory will not be affected by the reset.
We recommend to use the factory-provided calibration and not to change this one. The
calibration can be adjusted to meet regulatory requirements. For the calibration adjustment
procedure we recommend to use a standard with a value located in the upper third of the
measurement range to reduce the calibration error to a minimum.
5.3 Performance of VISOCOLOR
®
ECO tests
Instead of the VISOCOLOR
®
ECO measuring tube, a clean, dry 16 mm OD round tube is
used. Zero is adjusted with a second round tube (depending on the test either an untreated
sample or a reagent blind value).
Switch on the photometer
The display “Method _ _ _“ appears.
A VISOCOLOR
®
ECO test can be selected via the test number
(5 - xx)
or
using
/ via the list.
Perform a zero measurement
Insert the clean round tube with the blank value into the pho-
tometer and press
. Remove the round tube with the blank
value.