Technical Description: Inlet
Rapid Multi-Stream Sampler
C-10
Prima PRO & Sentinel PRO Mass Spectrometers User Guide
Thermo Fisher Scientific
The inlet controller handles all the control functions required for the
RMS and its associated calibration panels. The controller PCA is
mounted on the left hand side of the enclosure below the inlet
assembly. Most connections are via pluggable screw terminals.
The RMS sampling head drive is unidirectional and indexed at port 1
every rotation (see
). The controller drives the
sample arm to port 1, which is indicated by both the red and the
green LED being illuminated on the sensor PCB. If the reference
aperture cannot be found, the controller will stop searching after 60
seconds. The sample arm completes any port to port transit in less
than two seconds. Positioning failure (due to mechanical or
electronic failure) is communicated to the inlet controller and the unit
will re-index on the next commanded move.
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.
F3: 4 A (24 Vdc, all other functions). Supply OK indicated by
green LED D19.
A watchdog function is used to show that the processor is active (red
LED D6).
There are 24 outputs, individually addressable with up to 4 switched
on at any one time (limited in software). Each is designed to deliver
up to
300 mA at 24 Vdc and is intended to drive a single calibration gas
control solenoid valve.
Mains power is connected to J18 along with the heater(s) and over-
temperature thermal switch. This allows 115 Vac or 230 Vac
operation to be selected by means of a switch on the PCB.
Unplugging J18 or switching off the Inlet circuit breaker in the main
enclosure will remove mains power from the PCB.
Warning!
Removal of F1 will only break the L/L1 line. Power
might still be on the assembly from the N/L2 line.
Inlet Controller
General
Calibration Valve
Drives
Main Body Heater
