Quadrupole Mass Spectrometer: BELMASS

Mass spectrometer for qualitative and quantitative gas analysis

Mass spectrometry (MS) is an analytical technique for determining the molecular constituents of pure or mixed gases, vapors, liquids, and even solids. By bombarding the sample with an electron beam, ions are generated and separated according to their mass-to-charge ratio. The resulting mass spectrum is a plot of intensity as a function of mass-to-charge ratio.

BELMASS II is a quadrupole mass spectrometer (QMS), a unique mass analyzer used in mass spectrometry. As a quadrupole, it consists of four cylindrical rods arranged parallel to each other. By applying an oscillating electric field to the rods, the ions are separated based on the stability of their trajectories as a function of their mass-to-charge ratio (m/z). An electron multiplier detects the deflected ions. BELMASS II can be combined with various instruments. Especially in combination with a BELCAT II it can provide important information about the species of the desorbed gases from gas/vapor mixtures and their breakthrough curves.

Benchtop quadrupole mass spectrometer
Heated hose enables the analysis of vapors
Instrument with built-in mass spectrometer and vacuum pump

Overview

The mass detector is recognised to be the most efficient detector for qualitative analysis. However, it is difficult to obtain a good quantitative result because it analyzes only a small amount of gas.

By selecting the most suitable materials and components, Microtrac has successfully developed the mass spectrometer BELMASS II with a high quantitative capacity. Even ammonia gas can be analyzed by using a heated hose and a dry diaphragm pump.

1. Sniffer probe

3. Mass analyzer

5. Diaphragm pump

2. Heat hose

4. Turbo molecular pump

6. Vacuum gauge

Quadrupole Mass Spectrometer BELMASS II Measurement Software

With the software of the BELCAT II, the current strength of the individual components is measured continuously, while the start and end of the measurement can be set within a certain time range via timer. Linear, logarithmic and automatic scaling are available for the vertical axis. External Data, such as temperature, can be imported via analog signal input providing even more details. For comprehensive evaluation of the catalytic reaction, the BELMASS II mass spectrometer can be connected to a BELCAT series catalyst analyzer.

Selected ion monitor

Up to 16 mass numbers can be selected and the ion current can be monitored in time lapse
This mode is useful when the types of reaction gases are known.

Mass peak monitoring

The mass peak monitor continuously scans the set mass number range and displays the spectra.
This mode is useful when the types of reaction gases are unknown.

Status check

Self-diagnostic function
Easy maintenance

Quadrupole Mass Spectrometer BELMASS II Analysis Software

The obtained mass spectrum can be analyzed with Microtrac's ChemMaster II software. The key features of this user-friendly software are:

the spectrum can be processed and the area calculated
useful functions, such as "baseline correction", "spike noise filter", etc. allow accurate calculation of the chemisorption amount
"Distribution Fitting", a sophisticated peak deconvolution function, can split the measured spectrum into multiple peaks so that the number of active sites present on the catalyst surface can be determined
the spectrum of the pulse measurement can also be analyzed

The chemisorption amount, metal dispersion rate and other properties can be calculated automatically.

Area calculation

Distribution Fitting

Peak deconvolution

Quadrupole Mass Spectrometer BELMASS II Measurement Examples

The combination of the BELMASS II mass spectrometer with the BELCAT　II makes it possible to evaluate the catalytic reaction (TPReaction) in more detail. BELMASS　ll can record the sample temperature and is suitable for thermal analysis.

BELMASS II and BELCAT II combined

TPR MEASUREMENT ON CuO

Hydrogen consumption and water production can be observed at the same time.

Thermal decomposition of calcium oxalate

By heating the sample, m/z=18,28,44 can be detected.

Quadrupole Mass Spectrometer BELMASS II Typical Applications

chemicals

battery materials

ceramics

To find the best solution for your particle characterization needs, visit our application database

Application Database

Quadrupole Mass Spectrometer BELMASS II Technical Data

Maximum range	m/z = 1 ～ 200
Filament material	Yttria-coated iridium
Detector	Faraday cup / SEM
Resolution	M / -delta-M >= 2M
Sniffing section	Capillary tubes Standard-specification is made of SUS Option-specification is made of PEEK
Capillary tube dimensions	OD = 1/16 inch; ID = 0.1 mm; L = 1.5 m
Hot hose length	1 m
Maximum heating temperature of hot hose	200°C (SUS) 120°C (PEEK)
Gas introduction method	Differential exhaust
Amount of gas introduced	0.6 cc / min (at 1 atm)
Gas inlet pressure	Atmospheric pressure
Exhaust port fitting	1/4 inch one-touch joint
Communication Interface	RS-232C (straight)
Dimensions (W x H x D)	280 × 400 × 600 mm (excluding capillary tube)
Analog signal input	DC0 to 10V (10 bit, 1 ch)
Weight	36 kg
Power supply: Rated voltage	Single-phase: 100-120V (Indication 115V) AC: 200-240V (Indication 230V)
Power supply: Power frequency	50 / 60 Hz
Power supply: Power consumption	600 VA
Power supply: Electric shock protection class	Class I
Standard	CE, UKCA
Selected Ion Monitor	Max. 16 ch
Installation environment: Temperature	10°C to 35°C
Installation environment: Humidity	20%RH to 80%RH (no condensation)
Installation environment: Elevation	2000 m or less
Installation environment: Installation category	Category II
Installation environment: Pollution degree	2 (for indoor use)