Inlet Operation; General Description - Thermo Scientific Prima PRO User Manual

Inlet Operation

General Description

Thermo Fisher Scientific
Number of calibration inlets drives (max)
Flushing time required (t
polar gases)
Notes:
1
Gas must be free from liquids or materials that will condense at the operating
temperature of the inlet.
2
The total sample flow (i.e. total over all streams) should be considered with respect
to the exhaust line, such that back pressure is within the exhaust pressure limits
specified above.
3
Limit is to prevent over-pressurisation of and possible degradation in performance
of the mass spectrometer.
Warning!

Prima PRO Ex applications: The 0.2 bar(g) pressure limit is a requirement
of the ATEX/IECEx certification of the instrument and must not be
exceeded.

Sentinel PRO Ex applications: The inlets and exhaust must be maintained
below atmospheric pressure by using a suction pump connected to the
RMS exhaust port. This is a requirement of the ATEX/IECEx certification
of the instrument.
4
Pressure relative to exhaust pressure.
5
Higher temperatures may be possible. Consult factory.
6
Suitable for hose or compression fitting, depending on application.
Gas samples connected to the inlet ports are allowed to flow into the
common exhaust chamber of the RMS. Process gas samples are
typically allowed to flow continuously to minimize the gas response
time between the process sample point and the RMS. Calibration
gases normally only flow when required (see below).
The sample gas streams pass through the inlet ports and enter the
RMS common exhaust chamber via a series of holes (connected to
the inlet ports) in the RMS main body, or stator (see
rotary sample arm diverts the flow of one of these sample (or
calibration) gases through the sample arm and along an axial sample
tube (outer part) to the sample tube main body, which is on the inside
of the instrument enclosure. A 2µm screen filter is built into the
sample arm (Prima PRO only), so that the selected gas stream is
filtered before passing on to the analyser. It should be noted,
however, that this is not intended as an active filter, and is only a
backup to the main gas conditioning filters installed elsewhere
(upstream). It is useful for trapping any debris that may be left over
from initial fitting of sample lines.
The inlet assembly is attached to a mounting plate, which in turn
forms part of the instrument enclosure wall. All of the gas
Prima PRO & Sentinel PRO Mass Spectrometers User Guide
decay time, non-
99.9%
Technical Description: Inlet
Rapid Multi-Stream Sampler
composites
24
5 seconds
Figure C–4). A
C-3