Hach-Lange GANIMEDE N - Manual (Page 30)

30
Installation
Alternatively, it is possible to work with a two-point calibration. In addition, a zero standard
solution, or alternatively two standard solutions, is/are positioned in positions 35 and 36.
To do so, load the sample tray as follows:
• According to the sample batch, the sample tray is loaded with the samples from
position 1.
• For a two-point calibration, the standards are positioned with the measurement series
on a sample tray for 36 sample containers as follows:
Position 35: GCZ 100 zero solution
Position 36: standard, e.g. 0.2 mg/L PO
4
-P GCS 050
Alternatively:
Position 35: 1st standard, e.g. 0.2 mg/L PO
4
-P GCS 050
Position 36: 2nd standard, e.g. 2 mg/L PO
4
-P GCS 100
Single and double determinations can be carried out. For double determinations, the
sample is drawn from a container twice. The settings refer to the whole sample tray.
Two sample containers must be filled with the sample if the orthophosphate and total
phosphate content is to be determined from a sample. The allocation of the determination
method (orthophosphate or total P) to the position numbers of the sample containers is
performed during definition of the sample batch with the open-loop control unit. If
necessary, the use of the sample tray for 53 sample containers is recommended.
The following table and illustration show an example of a sample tray load for a two-point
calibration:
Table 4 Sample tray load for 36 sample containers, Ganimede P
Position Load
35 GCZ 100 zero solution
36 GCS 050 standard solution
1 Sample 1 orthophosphate
2 Sample 1 total phosphate
3 Sample 2 orthophosphate
4 Sample 2 total phosphate
5 Sample 3 orthophosphate
6 Sample 3 total phosphate
7 Sample 4 orthophosphate
8 etc. Sample 4 total phosphate, etc.