|High Pressure Gas Analyzer||QMS ... from $23,000|
|QMS Series — Up to 300 amu gas analyzers|
|(Click to enlarge)|
|QMS Series Gas Analyzers
|QMS series gas analyzers offer an efficient, cost-effective solution
for a wide range of applications. These mass spectrometers simplify
the task of on-line process monitoring, analysis of gas species,
leak detection, and troubleshooting.
The QMS system can continuously sample gas at flow rates of several milliliters per minute. The inlet can be equipped to sample at pressures from 1 bar to 10 mbar. Data is acquired continuously, as opposed to batch sampling which is employed by gas chromatographs.
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QMS Series Atmospheric Pressure Gas Analyzers
QMS series gas analyzers offer an efficient, cost-effective solution for a wide range of applications. These mass spectrometers simplify the task of on-line process monitoring, analysis of gas species, leak detection, and troubleshooting.
The QMS system can continuously sample gas at flow rates of several milliliters per minute. The inlet can be equipped to sample at pressures from 1 bar to 10 mbar. Data is acquired continuously, as opposed to batch sampling which is employed by gas chromatographs. The QMS has a fast response time of less than 0.5 seconds. Complete spectra can be recorded in seconds, and individual masses can be measured at rates up to 25 points per second.
Compact, User-Friendly Design
An advanced quadrupole mass spectrometer design, coupled with state-of-the-art pumping technology, allows the entire system to be integrated in a small, transportable package. The sampling inlet valves and pumps can be controlled from the front panel. Operation is easy and does not require a detailed understanding of the quadrupole or the pressure reducing inlet. Since the pumps contain no oil or other liquids, gravity has no effect on them which allows the unit to function either standing upright or laid on its side. Capillaries are used as sampling probes and are available in several materials and sizes for different applications.
Principle of Operation
The QMS uses a two stage pressure reducing inlet to sample gases at high pressure. This allows the use of a residual gas analyzer (which operates at high vacuum) as the detector. Different capillaries permit the system to sample at higher or lower pressures. A large flow is drawn through the capillary which drops the pressure three decades. A hybrid turbomolecular/drag pump draws a small amount of gas through an aperture, which reduces the pressure to about 10-6 Torr, while most of the flow is bypassed directly to a diaphragm pump. Solenoid valves control the gas flow. The entire system is controlled by a microprocessor which ensures correct operation of the pumps and valves. The software manages the spectrometer and acquires data in a choice of six different modes. An optional high-vacuum 2.75" CF port provides direct access to the RGA.
Bypass Flow Configuration
The bypass flow stream and the sample flow stream are recombined at the diaphragm pump, which makes it possible to use only one backing pump. This contributes to the systems small size. The bypass flow configuration is also critical to the fast response time of the QMS. Single-stage pressure reduction with leak valves would lead to extremely small flow rates and unreasonably long sample times. The bypass flow, on the other hand, gives a response time of less than 0.5 seconds from the tip of the capillary to the RGA chamber.
The QMS systems are supported with a Windows software package that runs on PCs. The intuitive graphical user interface allows measurements to be made quickly and easily. Data is captured and displayed in real-time or scheduled for acquisition at specified time intervals. Features include analog and histogram scan modes, pressure vs. time plots, leak detection, annunciator mode, gas library, audio and visual alarms, and comprehensive on-line help. Probe parameters can also be controlled and monitored through a high-level ASCII command set which allows easy integration into user control programs. A standard RS-232 interface is used as the data link to the host computer. A LabVIEW driver is also available.
|QMS Series Atmospheric Pressure Gas Analyzers|
|Type||Capillary available in stainless steel, and PEEK|
|Flowrate||1 to 10 milliliter per minute at atmospheric pressure|
|Pressure||10 mbar to greater than 1 bar (depending on capillary)|
|Detector||Faraday cup and electron multiplier|
|Range||100, 200 or 300 atomic mass units (amu)|
|Resolution||Better than 0.5 amu at 10 % of peak height|
|Detection limit||Less than 1 ppm|
|Operating pressure||5 × 10-6 mbar|
|Inlet||1/4" Ultra-Torr® fitting|
|Computer interface||RS-232C, 28800 baud, DB9 connector|
|Software||RGA Windows application|
|High vacuum pump||Hybrid turbo-molecular|
|Diaphragm pump||Advanced low pressure|
|Construction||SS304 and SS316|
|Seals||Viton®, buna-N, and nitrile butyl rubber|
|Startup time||5 minutes from full stop|
|Max. ambient temp.||35 °C|
|Power requirement||110 VAC @ 60 Hz or 220 VAC @ 50 Hz (not field selectable)|
|Dimensions||8.0" × 17.0" × 24.0" (WHL)|
|Warranty||One year parts and labor on defects in material or workmanship. Pump seals and diaphragm warranted for 90 days.|
|Power requirement||24 VDC @ 2.5 amps. Male DB9 connector. Optional 110/120/220/240 VAC adapter.|
|Warranty||One year parts and labor on defects in materials and workmanship|