Cross Port Leakage - Thermo Scientific Prima PRO User Manual

Technical Description: Inlet
Rapid Multi-Stream Sampler
Cross Port
C-14 Prima PRO & Sentinel PRO Mass Spectrometers User Guide
Check the status of the heater and thermal trip by disconnecting
at J18. The wires (1-5) from the heaters and trip are:




The electrical resistance between wires 4 and 5 should be
approximately 0 Ω, unless the RMS body is over temperature or
the thermal trip is faulty. The resistance between wires 1 and 2
and between 2 and 3 should be the same – around 140 Ω for a
system with cartridge heaters, either 70 Ω or 35 Ω (depending on
type) for a ring heater system.
Sample Tube Heater
Verify that the temperature readout is correct. Use an
independent temperature measurement if required. Unplug the
heater and check the heater resistance. The standard heater
should be approximately 19 Ω. Reconnect the heater, and switch
on the voltage across the heater. It should be 24 Vdc. Check fuses
if required voltage is not present.
This test should be carried out with the stator cover fitted.
Leakage
Set up a continuous flow of air on one or more ports (flow within the
specified limits) and a helium flow on another port. (The helium flow
does not need to be a continuous flow and can be a calibration port.
Helium should flow at typical calibration gas flow rates.) Sample the
air inlet and measure the mass 32 peak height. Next, sample the
helium inlet and check that the mass 32 peak height drops by the
required factor (for a Prima PRO the factor is system pressure (mbar)
 108, and for a Sentinel PRO the factor is 200).
If it is not possible to introduce air into the system, the test should be
carried out with process gas flowing. Measure the peak heights of
masses in the analysis and check against historic values (e.g. from a
calibration report from when the instrument was initially installed).
Backgrounds should be similar to the original values.
If the inlet fails to meet specification, follow the procedures for
inspection and / or replacement of seals detailed later in
"Maintenance".
Wire 1: Heater 1
Wire 2: Heater common
Wire 3: Heater 2
Wire 4 & 5: Thermal trip
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