2
Functional Description
MS Detector
34
Surveyor MSQ Plus Hardware Manual
Thermo Scientific
The first regulator, which is located on the front of the MS detector below the source
compartment, as shown in
, limits the flow of nitrogen gas to the API probe. You
nominally set this regulator to 5.2 bar (75 psi) for the ESI mode or 3.1 bar (45 psi) for the
APCI mode.
Figure 23.
User controlled auxiliary nitrogen regulator
The second regulator limits the flow of nitrogen gas to the reference inlet reservoir. This
regulator, which is inside the MS detector, is preset at the factory.
The first solenoid valve is the On/Off control for the flow of nitrogen gas into the Surveyor
MSQ Plus MS detector. To turn this valve on or off, you click the Nitrogen Gas On/Off
toggle button in the Per Method Parameters table of the Tune window (see
you turn on the nitrogen gas, you can hear the jet of nitrogen gas flowing into the API probe.
Note
Call a Thermo Fisher Scientific service representative if you suspect that the
nitrogen regulator inside the MS detector is malfunctioning.
Pressure gauge
Control dial
Nitrogen gas line
Reference inlet reservoir,
containing calibrant
Reference waste reservoir