Environmental Mass Spectrometer

Sentinel PRO

The Sentinel PRO Environmental Mass Spectrometer is a highly reliable and precise gas analyser designed for industrial settings, capable of monitoring and detecting toxic volatile organic compounds (VOCs) from fugitive emissions.

Last updated: June 27, 2024

Sentinel PRO

¨Reliable and efficient gas analyser

The Sentinel PRO Environmental Mass Spectrometer is an advanced gas analyser engineered to ensure industrial plant safety be detecting toxic volatile organic compounds (VOCs) in fugitive emissions. With its magnetic sector technology, this reliable and precise mass spectrometer offers species-specific detection, providing accurate data on VOC concentrations ranging from 1ppm to 100ppm. Its membrane inlet enhances sensitivity, enabling early leak detection and correction, minimising hazardous exposure risks.

The Sentinel PRO can efficiently monitor over 100 sample points within 15 minutes, surpassing traditional analysers in both speed and efficiency. Its fault-tolerant design ensures availability exceeding 99.7%, while simplified maintenance procedures reduce downtime.

In industrial chemical production units where potential danger exists from fugitive emissions of toxic organic vapors, regulatory authorities often require plants to maintain records of ambient vapor concentrations to protect workers from long-term exposure. The Sentinel PRO offers spatial and temporal resolution required to qualify as actionable information, which other technologies like electrochemical sensors or open path FT-IR spectroscopy cannot provide.

Your benefits

Technical Specifications*
*Subject to change without notice
Ion sourceEnclosed electron impact with dual filaments, temperature controlled (settable over range 120-200°C, to ± 0.1°C)
Analyser typeScanning, laminated electromagnet, 6 cm radius, 80° deflection
Mass range1-150 amu at 1000V ion energy; 1-300 amu at 500V ion energy
ResolutionSwitchable 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 stabilityMeasured at mass 28 < 0.013 amu over 24 hours
Peak shapeAt 60 resolution, the ratio of the width of the flat-top (99% height width) to the base peak width (5% height width) 0.5
DetectorFaraday and optional Faraday/SEM dual detector
InletTemperature controlled micro-capillary with Molecular leak and bypass (standard configuration)
Vacuum systemTurbo-molecular pump and external rotary pump
Alternatively, turbo-molecular Pump and internal diaphragm pump
Sample streams249
Analysis time0.3-1.0 sec/gas component
Ambient temperature12-25°C (12-35°C optional)
Lower Detection Double SEM1 ppm typical (may vary with gas matrix)
Lower Detection Single SEM0.1 ppm typical (may vary with gas matrix
Lower detection faraday20 ppm typical (may vary with gas matrix)
PrecisionAll readings within 0.5 ppm of calibrated value (24 hours)
Linearity<1% relative over a decade change in concentration (typical, application dependent)
Dynamic range1 ppm – 100% (theoretical, application dependent)
StabilityBetter than 10% relative over one month
Power requirements115/230 VAC, consumption 1500 VA
Serial connectionsRS232/422/485
Communications protocolsModbus, Siemens 3964, Siemens 3964R, VGCP, PVGCP
Physical dimensions (L x H x W)65 cm × 150cm × 70 cm
300 kg (configuration dependent)
Area classification optionsGeneral purpose: Z-purged Div 2 (optional); X-purged Div 1 (optional); CENELEC/ATEX Zone 1, IIC T3 (optional)

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