Table of Contents
Advertisement
Status & Tuning Parameters
Power
Amplifier +24V
Analyser
Supplies +24V
Instrument CPU
Inlet Probe
8-10
Prima PRO & Sentinel PRO Mass Spectrometers User Guide
electrode is part of the detector assembly and is positioned between
the quad lens and the detector.
The use of two resolving slits permits the selection of a very wide
resolving slit when low mass peaks are being measured. This feature
results in the production of broad, flat-topped peaks all the way down
to mass 1.
In conventional mass spectrometers, the resolving slit size is chosen
so as to resolve adjacent peaks at the high mass end of the scale
(peaks get closer together with increasing mass). The disadvantage to
having high resolution is that low mass hydrogen and helium peaks
become very narrow and therefore prone to drift when these peaks
are to be measured.
The high resolution slit is on-axis and for peaks above the switching
point, normally greater than mass 5, the voltage for the resolution
deflector will be close to zero.
Below the switch point, the voltage will be around 250 V, for
systems with 1000 V ion energy, deflecting the beam through the
broader low resolution slit.
Note: On the Sentinel PRO analyser, a different combination of
collector slits is used, and the switching point is typically set to mass
100. At lower masses the nominal resolution is approximately 85 and
at higher masses the nominal resolution approximately 135.
Power
The Amplifier +24V parameter is the 24 V PDU output for the
amplifier.
The Analyser Supplies +24V parameter is the 24 V PDU output
analyser electronics (ASU).
The Instrument CPU 24V parameter is the 24 V PDU output for the
24V
CPU card.
Fan 24V
The Fan 24V parameter is the 24 V power PDU output for the air
conditioner condenser fan (safe area only). Failure can also indicate
an alarm condition within the A/C.
The Inlet Probe Current parameter is the current through the inlet
Current
probe cartridge heater.
Thermo Fisher Scientific
Advertisement
Table of Contents
