Technical Description: Inlet
Rapid Multi-Stream Sampler
C-2
Prima PRO & Sentinel PRO Mass Spectrometers User Guide
Thermo Fisher Scientific
Warning!
Before working on the inlet assembly the following
points should be noted.
The inlet is heated at temperatures up to 120°C. Care must be
taken to avoid burns.
The inlet contains moving mechanical parts. Movement could
start unexpectedly.
Mains voltages exist in the supply to the main heater.
The remainder of the inlet (including the sample tube heater
and stepper motor) is driven from a 24 Vdc supply.
In general, it is recommended that the inlet is switched off,
the mains and 24 Vdc cables disconnected, and the unit be
allowed to cool before carrying out any service work.
The following table summarizes the specifications for this inlet
system. Detailed discussion can be found in following sections.
Table C
–1.
Inlet system specification
Number of inlets
32 or 64
Gas inlet connection (compression type tube
fittings)
1/4”, 1/8”, or 6 mm
Sample / calibration gas filtration requirement
2 µm
(1)
Sample gas inlet flow rate (regulated
externally)
Prima PRO
Typical: 0.5 Nl/min
Range: 0.1 to 5.0
Nl/min
(2)
Sentintel PRO
Typical: 5.0 Nl/min
Range: 2.0 to 10.0
Nl/min
Sample gas inlet pressure. Maximum, exhaust
blocked to give above typical flow.
0.2 bar(g)
(3)
Prima PRO: <0.1 bar
(4)
Sentintel PRO: 0.8
bar(abs)
Maximum sample gas / line temperature
200°C
(5)
Maximum operating temperature
120°C
Exhaust requirements
Pressure range: 0.8 -
1.2 bar(abs)
(3)
Stability: ±3 mbar/min
Exhaust connection
1" O.D. tube stub
(6)
Materials exposed to sample gas
Stainless steel, Viton,
PTFE / graphite
Inlet
Specification
