Contacts On Qma 250 And Qme 250; Checking The Qma 250 Analyzer - Pfeiffer Vacuum PrismaPro QMG 250 Translation Of The Original

10.2 Contacts on QMA 250 and QME 250
Fig. 34:
1 PP (partial pressure)
2 EM HV
3 Filament 1
4 Filament 2
5 Anode
6 RF-
7 GND
10.3 Checking the QMA 250 analyzer
Damage to components caused by cleaning
Do not clean either the filament or ion source, as this can damage or destroy the parts.
► Replace the parts if they are defective or contaminated.
The ion source of the PrismaPro has 2 filaments. In case of a defective filament, the PrismaPro can still
be used with the second intact filament. The previous use of the PrismaPro may, however, have influ-
enced the performance of the second filament.
Prerequisites
● PrismaPro deactivated
● Analyzer QMA 250 and electronic unit QME 250 disconnected
Required aids
● Ohmmeter (< 0.2 to 30 MΩ)
Procedure
1. Measure the resistance of each filament.
2. Measure the resistance of each pin with regard to the mass.
3. Measure the resistance of each pin with regard to each other.
4. Replace the filament or ion source if the measured resistance is not within the acceptable range.
Measurement
Filament 1
Filament 2
(see chapter "Contacts on QMA 250 and QME 250", page 67)
7 8
6 9
5
1
11
4
3 12
2
13

Contacts on QMA 250 and QME 250

– The measurement can also be performed in a vacuum.
Pins
3 and 10
4 and 10
10
8 GND
9 RF+
10 Filament Common
11 Reserved
12 Focus
13 TP (total pressure)
NOTICE
Measured resistance
0.2 to 0.8 Ω
> 0.8 Ω
0.2 to 0.8 Ω
> 0.8 Ω
8 7
6
9
5
10
1
11
4
12 3
2
13
Result
Filament intact
Filament defective
Filament intact
Filament defective
Malfunctions
67/86