Hach-Lange GANIMEDE N - Manual (Page 35)

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Section 4 Operation
4.1 Operation of the open-loop control unit
The sample batch is defined with the open-loop control unit according to:
• Parameter (phosphate with Ganimede P or nitrogen with Ganimede N)
• Number of samples
• Single or double determination
• Orthophosphate or total phosphate determination with Ganimede P
or low or high measurement range with Ganimede N
• Analysis as PO
4
, PO
4
-P or P
2
O
5
with Ganimede P
• Dilution factor
• User etc.
Defined sample batches can be saved and retrieved again, modified or copied at any time.
Thus, a new definition of repeated sample batches is omitted.
A two-point calibration, or alternatively a multi-point calibration, can be used in
measurement operation.
For a multi-point calibration, a standard curve must be recorded before the measurement
series. At least five standards are prescribed according to DIN. Optionally, an individual
standard curve is also possible with 2–11 measurement points. The device refers to this
recorded curve during measurement operation if desired.
Alternatively, a two-point calibration can be used during a measurement series with
Ganimede P. To do so, a zero solution (GCZ 100) and a standard are positioned in
positions 35 and 36, or alternatively two different standard solutions.
With Ganimede N, a two-point calibration is used by positioning two standard solutions for
the low and high measurement ranges in each position from 33 to 36.
The operation of the open-loop control unit is carried out via an external keypad or via the
alphanumeric keys of the open-loop control unit. The color graphical display shows the
operation of the different menu levels. Error messages, erroneous entries and abnormal
measurements are presented in color.
The communication of the open-loop control unit and the analysis unit takes place via the
IR interface. In order to enable a connection, the open-loop control unit must be brought
near (approximately 0.5 meters) to the analysis unit. A connection is established, then the
data that defines the sample batch is sent. The measurement procedure is started
automatically and the connection is disconnected.
The analysis unit saves all raw data during the measurement. This data can be retrieved
by the open-loop control unit at any time during or after the measurement. For this, the
connection via the IR interface is established again, the measurement results are
transmitted and displayed as a table in the open-loop control unit.
If the sample batch is processed completely and all data is sent, the connection is
disconnected automatically. The measurement results can be displayed, edited and sent
to the PC, printer and LIMS by means of the open-loop control unit.