Site Requirements
Inlet Gas Connections
Thermo Fisher Scientific
Prima PRO & Sentinel PRO Mass Spectrometers User Guide
3-5
Inspect the condition of the heat exchanger fins on a regular
basis. Clean as required.
Altitude must be less than 2000 m.
Calibration and sample gas lines to single or multi-point inlet options
are connected with Swagelok compression fittings (1/8” or 1/4” or 6
mm, as defined in the order). All fittings are supplied with PTFE
plugs fitted (ferrules packed separately) to provide a seal during
transit. These can be used as seals for unused ports, but it is
recommended that for long term use, particularly at elevated
temperatures, Swagelok plugs are substituted.
Calibration panels (six gas inlets per panel) are used in conjunction
with some inlet types to control calibration gas flow. A line pressure
of 1 bar(g) (adjustable for fine tuning) will give the required flow
rates, typically 150 cm
3
/min for Prima PRO instruments and 5 l/min
for Sentinel PRO instruments.
For some inlets (e.g. RMS and solenoid) flow is monitored internally
by the system. If the inlet configuration selected does not have this
feature external flow monitoring will be required.
Calibration gases lines connect to the panel via 1/8” or 1/4” or 6 mm
compression fittings, as defined in the order.
Calibration gases required for a given application are specified with
the quotation or application document. Contact the factory if this
document is not available.
Note:
Depending on complexity and constituents, some calibration
gas mixtures may have long purchase lead times.
Calibration gases should be of the highest quality with a certificate of
analysis from the manufacturer giving a concentration tolerance for
each component. Helium gas (for instrument background
measurement) should be at least 99.995% pure.
Gas consumption will depend on specified use and gas type. Each
line selected during calibration will be required to flow for between
15 seconds and 5 minutes, depending on factors such as gas type,
line length, line integrity, etc.
In addition to calibration cycles, some gases may also be designated
for instrument test or check functions. The frequency and duration of
these additional duties need to be accounted for in establishing likely
consumption rates and to schedule the ordering of replacement
cylinders.
Altitude
Inlet Gas
Connections
Calibration
Gases
