Sample Numbering; Identification Of Sample Location; Sample Dilution - MACHEREY-NAGEL PF-12 Plus Handbuch

To create and manage the user defined methods one can also use the free-of-charge
NANOCOLOR data export software from MACHEREY-NAGEL. This can be downloaded via
®
www.mn‑net.com. For all other information, refer to the software manual, which is available
from the same link.

16.2 Sample numbering

Plus
To differentiate between samples, the PF-12 assigns a sample number to every measure-
ment (starting with 0001). Subsequent measurements are numbered accordingly. You have the
option to change the sample number after every measurement and to assign it to the current
result. To do so, press before the next measurement. An entry option appears to enter the 4
digit sample number via the keypad. Once you have entered the sample number, it is displayed
together with all other sample information at the bottom of the display. The following measure-
ments are then automatically numbered. The sample numbering is carried out on the basis of
Plus
a daily counter. With each new day the PF-12 starts to count with the sample number 0001
and counts upwards for each further measurement.

16.3 Identification of sample location

To differentiate between sampling locations, you have the option to enter a sample location
after performing a measurement (up to 12 characters). Press key to open the entry option
for the sample location. Once you have entered the sample location, it is displayed together
with all other sample information at the bottom of the display. The sample location is added to
the result in the memory automatically. If you have entered additional sample locations before,
you can press to choose or edit the sample location from a list of up to 20 previously defined
sample locations with the keys / . For editing the sample locations choose the appropriate
entry with the / keys and replace the existing letters with the keypad. Deleting single digits
can be accomplished by typing the key "<<1>>" two times.

16.4 Sample dilution

During chemical analyses samples often have to be diluted to fit within a certain measuring
Plus
range. To avoid manual calculations, you can enter the dilution into the PF-12 , which will then
re-calculate the result, taking the dilution into account.
Example:
Expected result: between 80 and 200 mg/L
Measuring range photometer: 0.1–10.0 mg/L
Necessary dilution: (200 10 mg/L): at least 1:20 (1+19)
Recommended dilution: 1:25 to 1:50 to get within the middle of the measuring range
Dilutions are entered as 1 part sample plus X parts distilled water as to create distinct readings.
You can enter dilutions between 1+1 and 1+999.
Press before the next measurement to open the entry option for the dilution. The screen for
entering the dilution appears. Once you have entered the dilution, it is displayed together with
all other sample information at the bottom of the display. The result is immediately re-calculated
using the entered dilution.
Plus
Manual Photometer PF-12 EN, V2.00, 08.2021
63