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Inlet Controller
Thermo Fisher Scientific
A small fraction (7 to 10 cm
sampled by the micro capillary (and subsequently by the mass
spectrometer). Excess gas flows to the common exhaust.
For a detailed description of the gas transfer system into the Prima
PRO mass spectrometer refer to
Introduction of a Gas Sample"
Heating
Heating of the system is split into two parts, the micro capillary
block assembly and the six-way sample manifold. In the case of a
single sample inlet system, the six-way manifold is not used and an
adaptor block of the same dimensions is fitted in its place, such that
this can be heated in exactly the same way. The capillary block and
manifold (or adaptor block) can be heated up to 60°C.
The micro capillary assembly is heated by means of a 24 V 30 W (19
Ω) cartridge heater. Temperature is monitored using a PRT. See
Figure
C–7.
The valve manifold (or adaptor block) is heated by means of a heater
block fixed along one side. The heater block has two cartridge
heaters embedded in it, operating at mains voltage. The heaters are
connected in parallel or series to allow 115 Vac or 230 Vac operation
respectively (see
dissipated is 50 W. Individual heaters are 576 Ω.
The heater block contains a thermocouple to allow temperature
monitoring. A thermal switch is also attached to the heater block
(fixed set point of 70°C) to provide a heater cut-out in the event of a
controller fault (runaway condition).
General
The inlet controller handles all the control functions required for the
solenoid inlet and its associated calibration panels. The controller
PCA is mounted on the left side of the enclosure below the inlet
assembly. Most connections are via pluggable screw terminals. The
controller PCA is the same as that used for other inlet systems, such
as the RMS.
The controller is powered from the main enclosure power supply (24
Vdc). Mains power is required for the main body heater (see below).
Fuses (all on PCB):
F1: 5 A (mains)
F2: 1 A (24 Vdc, calibration gas valves). Supply OK indicated by
green LED D2.
3
min
"
in Appendix B.
"Inlet Controller"
Prima PRO & Sentinel PRO Mass Spectrometers User Guide
Technical Description: Inlet
-1
) of the selected gas stream is
below). The total power
Solenoid Inlet
C-31
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