Metrohm 920 Absorber Module - Manual (Page 29)

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4 Installation
920 Absorber Module
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15 FEP tubing M6 for 920, 150 cm
(6.1838.020)
Aspiration tubing for ultrapure water. Con-
nection between the Dosino with the water
bottle.
16 PTFE capillary, 0.5 mm ID / 3 m
(6.1803.030)
Approx. 30 cm. Connection between the
Dosino with ultrapure water and the Metro-
sep I Trap 1 - 100/4.0 trap column
(6.1014.200).
17 PTFE capillary, 0.5 mm ID / 3 m
(6.1803.030)
Approx. 40 cm. Connection between the
Metrosep I Trap 1 - 100/4.0 trap column
(6.1014.200) and the 6-port valve.
The Dosino is equipped with a 5 mL dosing unit and is inserted in the back
in the accessory space (4-10). It has three tasks:
￭ Dosing the water infeed during combustion.
￭ Dosing the transfer water for matrix elimination of the sample.
￭ Liquid Handling.
Dosing the water infeed during combustion
Feeding water in at the combustion tube's inlet supports the combustion
process and increases the recovery rate, particularly for fluoride. To do so,
the Dosino aspirates the ultrapure water from the bottle and doses a very
small amount through port 4 to the combustion tube's inlet. The time and
quantity of the water infeed are defined in MagIC Net™.