00196101-04_Serviceanleitung Vakuumtest 08-2018_D-E - 第81页
Service manual vacuum check with closed nozzles Page 81 fr om 136 The values for the holding circuit m ust lie bet ween -700 mbar an d -950 mbar (dependi ng on the h eight a bove sea level: t he higher t he locati on, th…
Service manual vacuum check with closed nozzles
Page
80 from 136
• Choose Vacuum values, height values and scan values of the nozzles on the head (1).
• Choose the tab “Vacuum values” (2).
• Press the button „Measure vacuum values“ (3).
Evaluating the results:
NOTE
Closed nozzle types
When measuring with the closed pipettes (1069, 4069), measuring tolerances can lead to a
negative result in determining the difference between the open and closed values.
As a result, for nozzle types with which such low difference values are to be expected, this
"deviation" is not evaluated (for example, 1069, 1003).
For these types of nozzles, the difference between "Open" and "Closed" must be determined by
yourself.
For all other types of pipettes, the difference is displayed in the "Difference" column.
Difference between
open and closed
permitted difference:
+/- 10 mbar
Not relevant!
Not relevant!
1
3
2
Service manual vacuum check with closed nozzles
Page
81 from 136
The values for the holding circuit must lie between
-700 mbar and -950 mbar
(depending on the height above sea level: the higher the location, the lower the values).
Comparison: Measurement using type 1235 nozzles (calibration nozzles).
Service manual vacuum check with closed nozzles
Page
82 from 136
4.2.5 Vacuum tests on C&P20 / C&P20a / C&P20m heads (Venturi)
In order to provide guidance when troubleshooting, a number of different modifications were
made to a CP20a head and vacuum tests were then carried out with type 1235 open nozzles
(calibration nozzles) and type 1069 closed (red) nozzles, and the results were compared.
For the sake of clarity, only the first 8 measurements that were taken are shown
here.
The modifications were always carried out on segment 1.
4.2.5.1 Measurements without any modifications (NOMINAL values)
a.) With type 1235 nozzles
NOMINAL