P R O C E S S A N A LY Z E R S

Highly precise, multiport magnetic sector mass spectrometer

Pro d uc t Speci f i cati o ns

Thermo Scientific Prima BT
Bench top Mass Spectrometer

The Thermo Scientific™ Prima™ BT
Bench top Mass Spectrometer is ahighly reliable, precise, and flexible
gas analyzer specifically designed forprocess development laboratories.
•Scanning Magnetic-sectortechnology•

16-port Rapid Multistream
Sampler (RMS)•6-port Automatic calibration
manifold•

High analytical precision, accuracy,and stability

The Thermo Scientific Prima BT Benchtop Mass Spectrometer is an industrial
laboratory gas analyzer based on scanningmagnetic-sector mass spectrometry.
Designed for continuous operation in aprocess environment, the Prima BT mass
spectrometer is simple to operate and easy
to maintain.

Operating Principles
The sample gas is introduced via a stream
selector and a pressure reduction system,comprised of a capillary and molecular leakthat transmits a small proportion of the gas
into the ion source which operates underhigh vacuum. Using an electron emitting
filament, the ionization chamber converts
the sample molecules into ions which arepositively charged molecules or parts ofmolecules. These ions are then separated
according to their mass by a variablemagnetic field. The different mass ions arethen quantified by the detector in accordancewith the abundance of the signals at thesemasses.

Analytical Platform
The primary feature of the Prima BT mass
spectrometer is the magnetic sector
analyzer. This field-proven technology has
demonstrated the strongest performancefor industrial on-line gas analysis. Magnetic
sector technology offers precision, accuracy,
long intervals between calibrations, andresistance to contamination. The flattopped peak profile ensures that the gas
composition measurements are highly
reproducible and the laminated magnet
enables high scanning speeds.
The Prima BT mass spectrometer offers
robust performance in the presence ofgases and vapors that have the potential tocontaminate internal vacuum components.
As the ions are extracted from the ion sourceat high energy, excellent stability is achieved
for low molecular weight compounds such ashydrogen and helium.

2

Inlet System Options
Available options include stepper motor
controlled Rapid Multi-stream Sampling(RMS), single point solenoid inlet, and single
point continuous inlet.
The unique RMS inlet system allows for theselection of 1 to 16 streams and sets new
standards for speed and reliability ofmulti-stream sampling and maintenanceintervals. Stream settling times areapplication dependent and user configurable.
The RMS includes digital sample flow
recording for every selected stream. This canbe used to trigger an alarm in case of fall off
in sample flow, for example due to a blocked
filter in the sample conditioning system.
This unit includes inlet electronics for controlof the stepper motor, calibration panel andRMS temperature (up to 80°C). The positionof the stream selector is optically encoded
for reliable, computer controlled stream
selection. The temperature and position
control signals are communicated to thesoftware system via the internal industrial
network.
Calibration Panel Option
An optional panel assembly is available
when the RMS or single point solenoid
configuration is selected. The panel contains
six solenoid valves for automatic selection ofcalibration gases.
Electronics
Power supply and distribution has been
engineered to ensure minimum power
consumption and maximum reliability withextensive system monitoring at all points
around the network.
The local processor provides embedded
processing power for true, stand-alone
control of all mass spectrometer functions
while the local network provides control of allancillary equipment. A serial port is provided
for connection to a PC and an additional two
configurable serial ports allow for remotecommunication. OLE for process control(OPC) and Modbus protocol communications
are provided as standard.
The Vacuum System
The Prima BT mass spectrometer vacuum
system includes an external floor mounting
rotary pump that provides backing vacuum
for evacuating the analyzer. It also provides
pumping for the inlet bypass capillary, apump controller to control the operationof the high-performance turbo-molecular
pump, and an active cold-cathode vacuum
gauge for interlock protection of the ion
source filaments. As an option the external

Prima BT Mass Spectrometer configured for 15 Sample Streams and 6 Calibration Streams

floor mounting rotary pump can be replacedby an internal diaphragm pump to fit within
the instrument enclosure.
Thermo Scientific™ GasWorks Software
The GasWorks software is designed foreasy configuration and simple operationand maintenance of Thermo ScientificProcess Mass Spectrometers without
specialist knowledge of mass spectrometry.
Included in the system are industry standard
communication protocols, multi-levelsecurity, event logging, automatic calibrationand tuning, diagnostics, and Wizard PRO
help functions. Additionally, the suite features
an extensive array of data presentation forms
that can be configured to meet the needsof a variety of control-room or laboratory
situations.

System Architecture
GasWorks Software is a two-processor
system. The primary machine is thecontrol engine built into the instrument andprovides a fully multi-tasking 32-bit realtime industrial control system to manage all
aspects of instrument control. It contains a
database of all instrument configurations andoperational details, and retains this throughpower fail thus allowing restart without userintervention. This database contains all dataneeded for instrument operation allowing theconfigured analyzer to be self-automated,
programmed to automatically send results to
the DCS or LIMS, and to additionally performself-calibration when necessary.
The instrument controller does not require
installation because the program is burned-inand the data loaded from the host GasWorks
Software machine.
The remote GasWorks Software system
operates on a personal computer (PC)running Windows® XP, Vista or 7, andprovides a convenient graphical userinterface for configuring analysis methods,
derived value calculations, calibration
routines, communication protocols, I/O,
alarm levels, and more. The host GasWorks
Software machine also provides realtime analysis numeric and trend displays,
together with various mass spectral scanmodes, data logging in csv spreadsheet
format and dynamic data exchange (DDE)for presentation of the data over a network.
Also provided are comprehensive data review
programs for numeric and trend displays andstatistical calculations of stored data.
The primary embedded computer system
operates with a true industrial operating
system in complete stand-alone mode. This
ensures that measurement modes can becontrolled without requiring access to thePC and the results can be communicateddirectly to the host, SCADA, or LIMS.

3Prima BT Process Mass Spectrometer 16 port Rapid Multi-stream Sampler

Accuracy Considerations
It is often the case, that the peaks being
measured are ‘overlapped’ or compositewith contributions from more than onecomponent. A de-convoluting data reduction
technique is involved in deducing thecomponent contributions to the peaks.
With the Prima BT this is performed
automatically by an embedded processor
in the mass spectrometer. An important
assumption is made (and is generallyobeyed) that the overlapping peaks, whencombined, obey the principle of linear peaksuperposition. The principle states thatthe composite peak height at a particularmass is simply equal to the sum of the peakheights which correspond linearly to theindividual concentrations of the contributing
components in the complex mixture.
The effect of overlapping peaks will
necessarily influence the accuracy ofmeasurement in the event that minor
components in the sample gas are heavily
overlapped by much larger concentrations.
The Applications Group at Thermo Fisher
Scientific will provide a detailed performance
guarantee (to be included in any quotation)
on submission of a customer stream
specification. The most appropriate analyticalmethod and calibration scheme will also be
defined for each of the sample streams to bemeasured.

Component

Concentration %mol

Standard deviationNitrogen

Balance0.005%mol

Oxygen150.005%mol

Argon

10.001%mol

Carbon dioxide

100.005%mol

Industry Laboratory Environment
The Thermo Scientific Prima BT mass
spectrometer is intended for use in processdevelopment labs where gas component
concentrations in the range 20ppm - 100%
require precise measurement. Additional low
parts per million (ppm) concentrations can be
added to the analysis by use of the optional
multiplier detector.
The Prima BT mass spectrometer is built
on the technology of the Thermo ScientificPrima PRO process mass spectrometerand is designed for optimal performancelevels when operated in a general-purpose,temperature-controlled environment.

World Class Service Support
The Prima BT mass spectrometer is
supported by global service capabilities
including a variety of unique service
and support options designed to ensure
instrument optimization and reduce potential
downtime. Options include:•Service Agreements•

Technical Support•

Spare Parts•

Field Installation and Service•

Product Training•

Comprehensive Service Kits

Thermo Scientiﬁc Prima BT Bench top Mass Spectrometer
Enclosed Electron Impact with Dual Filaments, temperature controlled(settable over range 120-200 degrees C, to ± 0.1 degrees C)

Analyzer Type

Scanning Laminated Electromagnet, 6 cm radius, 80 degrees deﬂection

Mass Range

Adjustable, default is 1-150 amu at 1000 eV ion acceleration voltage,(at 750 eV ion acceleration voltage, mass range is 1-200 amu)

Resolution

Switchable between two collector resolving slits, resolving powers of 60 (1mm) and 20 (4 mm) are standard.
Optionally 140/85 (0.36 mm/0.69 mm) or 100/45 (0.56 mm/1.45 mm) or 140/45 (0.36 mm/1.45 mm) may be ﬁtted

Mass Scale Stability

Measured at mass 28 < 0.013 amu over 24 hours

Peak Shape

At 60 resolution, the ratio of the width of the ﬂat-top (99% height width) to the base peak width (5% height width) 0.5

Abundance Sensitivity<250 ppm for 27/28 amuDetector

Faraday and optional Faraday/SEM dual detector

Inlet

Temperature controlled micro-capillary with Molecular leak and bypass (standard conﬁguration)

Vacuum System

Turbo-molecular Pump and external Rotary Pump
Alternatively Turbo-molecular Pump and internal diaphragm pump

Sample Flow

Digitally measured and recorded for each stream for any instrument with RMS optionPrecision<0.1% relative (typical, application dependent) external rotary pumpLinearity<1% relative over a decade change in concentration (typical, application dependent)

Dynamic Range

10 ppb – 100% (theoretical, application dependent) external rotary pump only

Stability<1% relative over 1 week (typical, application dependent)

Power Requirements

115 Vac (±5Vac) or 230 Vac (±10 Vac)

Physical Dimensions

52cm (20.5”) H x 79cm (31.1”) W x 47cm (18.5”) D
100 kg (200lbs) conﬁguration dependent

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