Velp Scientifica
– UDK139 Operating Manual
10004762/B5
47
6.
Work cycle
The unit can perform different types of analysis:
Analysis
Devarda’s analysis
The steps involved for each method are shown below.
6.1.
Analysis
1. Switch on the instrument using the ON/OFF switch on the rh side of the
instrument;
2. The instrument carries out preheating lasting 3 minutes;
3. Turn on the tap water;
4. Position the empty test tube;
5. Position the anti-skid disk on the flask stand;
6. Position the flask on the anti-skid disk;
7. Make sure that the distillate outlet tube is correctly positioned in the flask (it
should reach the bottom of the flask)
8. Carry out manual or automatic check-up;
9. Carry out one or more wash-downs;
10. Carry out one or more blank analyses;
11. Position the test tube containing the sample;
12. Select the analytical method required.
13. Enter the GLP data for the analysis (operator name, sample name, sample
quantity, distillation time);
14. Start analysis.
15. An acoustic signal indicates that the work cycle has terminated.
16. Remove the test tube and replace it with a new sample. If distillation series has
finished, place an empty test tube in the unit.
17. Press
to start a new analysis.
6.2.
Devarda’s analysis
1. Switch on the instrument using the ON/OFF switch on the rh side of the
instrument;
2. The instrument carries out preheating lasting 3 minutes;
3. Turn on the tap water;
4. Position the empty test tube;
5. Position the anti-skid disk on the flask stand;
6. Position the flask on the anti-skid disk;
7. Make sure that the distillate outlet tube is correctly positioned in the flask (it
should reach the bottom of the flask)
8. Carry out manual or automatic check-up;
9. Carry out one or more wash-downs;
10. Carry out one or more blank analyses;
11. Position the test tube containing the sample;
12. Select the analytical method required making sure that a Pause value >0:00 has
been entered;
13. Enter the GLP data for the analysis (operator name, sample name, sample
quantity, distillation time);
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