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Sentinel PRO – Environmental Mass Spectrometer

Ensure plant safety by enabling leak detection and correction before any toxic hazard is created with the Thermo Scientific™ Sentinel PRO Environmental Mass Spectrometer. This next-generation environmental mass spectrometer is engineered to help plants monitor fugitive emissions of toxic organic vapors, protecting workers and surrounding environment from hazardous exposure.

The fast, accurate and reliable Sentinel PRO environmental mass spectrometer can monitor 100 or more sample points within 15 minutes. It features detection of several species-specific volatile organic compounds (VOCs) in the 1ppm – 100ppm range. Rugged fault-tolerant design ensures availability in excess of 99.7%, and simplified maintenance procedures make it easy to own. A single Sentinel PRO analyzer can replace an entire rack of discrete, less sensitive analyzers to improve detection and significantly reduce ongoing maintenance and operating costs.
Increased sensitivity, accuracy, precision and mass range:
  • Completely redesigned electronics, incorporating higher specification components
  • Capable of monitoring 100 or more sample points within 15 minutes
  • Species-specific VOC detection in the 1ppm – 100ppm . range
  • Reliable, fault-tolerant design for 99.7% higher availability
  • Significantly enhanced analyzer control
  • Enhanced connectivity with DCS systems and offline data manipulation packages


  • Provides a large number of sampling points that can be located near potential leak points (i.e. valve body, etc.)
  • Unique fast multi-threaded sampler (RMS) with 32 or 64 ports
  • Stable with automatic calibration interval from 30 to 90 days
  • Complete service access from the front of the system, effectively reducing the footprint
  • Small footprints don’t need a big shelter
  • Requires minimal maintenance
  • Thermo Scientific™ GasWorks software
Specifications Description
Product Type Sentinel PRO Environmental Ambient Air Trace VOC Gas Analysis Mass Spectrometer
Ambient Temperature 12°C to 40°C
Communication Protocols Modbus serial RS232/422/485, Siemens 3964R, VGCP and PVGCP; optional via protocol converters: Modbus Ethernet TCP/IP and Profibus DP
Mass Range Adjustable, 1 to 150 amu at 1000 eV ion acceleration voltage, 1 to 300 amu at 500 eV ion acceleration voltage
Analysis Time
0.3 to 1.0 sec. per gas component
Analyzer Type Scanning Magnetic Sector Mass Spectrometer with Enclosed Electron Impact Dual Filament Ion Source
Area Classification Options
General Purpose; Z-purged Class 1 Div 2 (optional); ATEX Zone 1, IIC T3 (optional)
Depth 0,8 m
Dynamic Range 10 ppb to 100 ppm or 100 ppb to 1000 ppm
Height GP: 1,5 m, Ex: 1,8 m
No. of Calibration Gas Inlets Up to 6 (standard); optional to 24
No. of Sample Stream Inlets Up to 31 or 63 (standard); optional to 126
Power 115/230 V, Consumption GP: 2.0 kVA; Ex: 2.5 kVA
Precision ≤±0.5 ppm over 24 hours, ≤±1 ppm at 10 ppm concentration over 1 month
Weight 240kg
Width 1m